1. The utility model provides a soil body fracture toughness and tensile strength's device which characterized in that: the detection device comprises a detection accommodating hose (1), a coordinated detection output structure (2), a first positioning auxiliary detection plate (3) and an equivalent stress detection structure (4), wherein the detection accommodating hose (1) is fixedly connected with the first positioning auxiliary detection plate (3) at the bottom end, the detection accommodating hose (1), the two sides of the first positioning auxiliary detection plate (3) are fixedly connected with the coordinated detection output structure (2), and the detection accommodating hose (1) is fixedly connected with the equivalent stress detection structure (4).

2. The apparatus of claim 1, wherein the apparatus further comprises: the matching detection output structure (2) comprises a supporting and carrying plate (5), a transverse guide block (6), a first motor (7), a screw rod (8), a polish rod (9) and a matching push block (10), the top end of the supporting and carrying plate (5) is welded with a transverse guide block (6), one end of the transverse guide block (6) is fixedly connected with a first motor (7) through a screw, the output end of the first motor (7) is fixedly connected with a screw rod (8), the other end of the screw rod (8) is rotatably connected with the inner side of the transverse guide block (6), two polish rods (9) are welded on the inner side of the transverse guide block (6), the polish rod (9) is positioned at two sides of the screw rod (8), the outer side of the polish rod (9) is connected with a matching push block (10) in a sliding way, the inner side of the matching push block (10) is also connected with the screw rod (8) through threads.

3. The apparatus of claim 2, wherein the apparatus further comprises: the matching detection output structure (2) also comprises a rodless cylinder (11), a matching lapping plate (12), a second motor (13), a turning toggle block (14), a first hydraulic piston cylinder (15) and an extrusion stress push block (16), the top end of the matching push block (10) is fixedly connected with a rodless cylinder (11), one end of the rodless cylinder (11) is connected with a plurality of matching and lapping plates (12) in a sliding way, one side of the matching and carrying plate (12) is fixedly connected with a second motor (13) through a screw, the output end of the second motor (13) is fixedly connected with a turnover toggle block (14), the other side of the turning toggle block (14) is rotationally connected with the matching flip board (12), one end of the turning toggle block (14) is fixedly connected with a first hydraulic piston cylinder (15) through a screw, the output end of the first hydraulic piston cylinder (15) is fixedly connected with an extrusion stress push block (16).

4. The apparatus of claim 3, wherein the apparatus further comprises: the equivalent stress detection structure (4) comprises a detection stroke carrying pipe (17), a positioning containing carrying structure (18), an auxiliary carrying plate (19), a second hydraulic piston cylinder (20), a coordination detection structure (21), a second positioning auxiliary detection plate (22) and a magnetic suction interface (23), wherein the bottom end of the detection stroke carrying pipe (17) is fixedly connected with the positioning containing carrying structure (18), one side of the detection stroke carrying pipe (17) is fixedly connected with the auxiliary carrying plate (19), the top end of the auxiliary carrying plate (19) is fixedly connected with the second hydraulic piston cylinder (20) through a screw, the output end of the second hydraulic piston cylinder (20) is magnetically connected with the magnetic suction interface (23), the bottom end of the magnetic suction interface (23) is fixedly connected with the second positioning auxiliary detection plate (22), the top end of the detection stroke carrying pipe (17) is fixedly connected with the coordination detection structure (21), the bottom end of the matching detection structure (21) is fixedly connected with a second positioning auxiliary detection plate (22).

5. The apparatus of claim 4, wherein the apparatus further comprises: the location is held and is carried structure (18) including wide distance take-up board (24), supplementary locating plate (25), first spring (26) and adaptation clamp piece (27), the bottom welding of wide distance take-up board (24) both sides has supplementary locating plate (25), one side welding of supplementary locating plate (25) has first spring (26), the one end welding of first spring (26) has the adaptation to press from both sides tight piece (27), the inboard and the detection that the adaptation pressed from both sides tight piece (27) hold hose (1) laminating.

6. The apparatus of claim 4, wherein the apparatus further comprises: join in marriage and move detection structure (21) and derive slide bar (31) including test internal rotation pipe (28), pressure detector (29), second spring (30) and atress, the top fixedly connected with pressure detector (29) of test internal rotation pipe (28), the bottom fixedly connected with second spring (30) of pressure detector (29), the bottom welding of second spring (30) has the atress to deduce slide bar (31), the inboard sliding connection of slide bar (31) and test internal rotation pipe (28) is deduced to the atress, the bottom and the supplementary pick-up plate (22) welded connection in second location of slide bar (31) are deduced to the atress.

7. The apparatus of claim 4, wherein the apparatus further comprises: the structure of second location auxiliary detection board (22) and first location auxiliary detection board (3) is the same completely, first location auxiliary detection board (3) and second location auxiliary detection board (22) all include detection board main part (32), third hydraulic piston cylinder (33) and location locking bolt (34), the bottom of detection board main part (32) both sides all is through screw fixedly connected with third hydraulic piston cylinder (33), the output fixedly connected with location locking bolt (34) of third hydraulic piston cylinder (33).

8. The apparatus of claim 1, wherein the apparatus further comprises: the detection containing hose (1) is made of transparent rubber.

9. A method of using the apparatus for soil fracture toughness and tensile strength of any one of the preceding claims, the method comprising the steps of:

the first step is as follows: inserting a quantitatively-shaped soil body into the detection accommodating hose (1), and clamping the equivalent stress detection structure (4) at the top end of the detection accommodating hose (1) through the positioning accommodating carrying structure (18);

the second step is that: the extrusion stress push blocks (16) are in proper testing distance, height and angle through controlled derivation, at the moment, the first hydraulic piston cylinder (15) is controlled to finish derivation of the extrusion stress push blocks (16), the extrusion stress push blocks (16) extrude and detect the accommodating hose (1), the detection of the angle stress of the soil body in the accommodating hose (1) is finished, and therefore sigma 1, sigma 2 and sigma 3 are formed;

the third step: the surging derivation towards the top end is formed by the stressed extrusion of the soil body, so that the second positioning auxiliary detection plate (22) is stressed to push the extrusion stress derivation slide rod (31), the stress derivation slide rod (31) is utilized to push the extrusion second spring (30) to finally form specific stress data at the pressure detector (29), and therefore sigma H is formed;

the fourth step: calculating specific fracture toughness according to a formula;

the fifth step: separating the equivalent stress detection structure (4) from the detection containing hose (1), pouring out the original soil body in the detection containing hose (1), and inserting the detected soil body with the same weight and body type as the first detection into the detection containing hose (1);

and a sixth step: controlling a second positioning auxiliary detection plate (22) and a third hydraulic piston cylinder (33) in the first positioning auxiliary detection plate (3) to finish the derivation of a positioning locking bolt (34), so that the positioning locking bolt (34) is inserted into the soil body to form the positioning of the top end and the bottom end of the soil body;

the seventh step: the output end is pressed down by controlling the second hydraulic piston cylinder (20), at the moment, the magnetic suction connector (23) is started to be connected with the output end of the second hydraulic piston cylinder (20) through magnetic suction, and the second hydraulic piston cylinder (20) is utilized to drive the output end to reset so as to finish dragging the soil body in the detection accommodating hose (1);

eighth step: and continuously observing the change of the pressure value at the pressure detector (29) before the soil body is not completely disconnected when observed from the outer side of the detection containing hose (1), thereby obtaining the equivalent stress numerical value of the tensile stress strength of the soil body.

Background

With the rapid development of society, more and more special clay begins to be applied in different fields, in order to ensure the performance of special clay, the fracture strength and the tensile strength of the special clay need to be continuously judged, but the prior art is inconvenient for carrying out efficient and stable automatic determination of fracture toughness and tensile strength on the soil body.

Disclosure of Invention

The invention aims to provide a device for soil fracture toughness and tensile strength and a using method thereof, which aim to solve the existing problems: the prior art is inconvenient for the efficient and stable automatic determination of fracture toughness and tensile strength of soil.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a soil body fracture toughness and tensile strength's device, holds the hose including the detection, moves detection output structure, first location auxiliary detection board and equivalent stress detection structure, detect the first location auxiliary detection board of the bottom fixedly connected with that holds the hose, the both sides fixedly connected with of first location auxiliary detection board moves detection output structure in coordination, detect the top fixedly connected with equivalent stress detection structure that holds the hose.

Preferably, the cooperation detects output structure including supporting the support board, horizontal guide piece, first motor, screw rod, polished rod and the ejector pad that moves, the top welding that supports the board of taking has horizontal guide piece, the first motor of screw fixedly connected with is passed through to the one end of horizontal guide piece, the output fixedly connected with screw rod of first motor, the other end and the inboard rotation of horizontal guide piece of screw rod are connected, two polished rods are still welded to the inboard of horizontal guide piece, the polished rod is located the both sides of screw rod, the outside sliding connection of polished rod has the cooperation to move the ejector pad, the inboard of the ejector pad that moves still passes through threaded connection with the screw rod.

Preferably, the cooperation detection output structure further comprises a rodless cylinder, a cooperation carrying plate, a second motor, a turning and stirring block, a first hydraulic piston cylinder and an extrusion stress pushing block, wherein the rodless cylinder is fixedly connected to the top end of the cooperation pushing block, one end of the rodless cylinder is slidably connected with the plurality of cooperation carrying plates, one side of the cooperation carrying plate is fixedly connected with the second motor through a screw, the output end of the second motor is fixedly connected with the turning and stirring block, the other side of the turning and stirring block is rotatably connected with the cooperation carrying plate, one end of the turning and stirring block is fixedly connected with the first hydraulic piston cylinder through a screw, and the output end of the first hydraulic piston cylinder is fixedly connected with the extrusion stress pushing block.

The torque output to the screw rod is completed by controlling the first motor, so that the screw rod rotates, and the screw rod is connected with the matching push block through the screw thread, the matched pushing block obtains torque, the torque at the matched pushing block is limited to form sliding displacement by the sliding connection of the matched pushing block and the polished rod, the transverse distance of the extrusion stress pushing block close to the detection containing hose is adjusted by the driving of the sliding displacement of the matched pushing block, all matched carrying plates are driven by the rodless cylinder at the moment, the height of the extrusion stress pushing blocks relative to the detection containing hose is adjusted, and the second motor is used for driving the turning and stirring block to rotate, so as to complete the adjustment of the forced leading-out angle of the extrusion stressed push block, after the adjustment is completed, the first hydraulic piston cylinder is controlled to complete derivation of the extrusion stress pushing block, so that the extrusion stress pushing block applies a plurality of main stresses to the detection accommodating hose.

Preferably, the equivalent stress detection structure includes that the detection stroke carries on the pipe, the location holds carry-on structure, supplementary carry-on board, second hydraulic cylinder, cooperation detection structure, second location auxiliary detection board and magnetism inhale the interface, the bottom fixedly connected with location that detects the stroke and carry-on the pipe holds carry-on structure, the supplementary carry-on board of one side fixedly connected with of detection stroke carry-on pipe, screw fixedly connected with second hydraulic cylinder is passed through on the top of supplementary carry-on board, the output magnetism of second hydraulic cylinder is inhaled and is connected with magnetism and inhale the interface, the bottom fixedly connected with second location auxiliary detection board of interface is inhaled to magnetism, the top fixedly connected with cooperation that detects the stroke and carry-on the pipe detects the structure, cooperate the bottom and the supplementary pick-up board fixed connection in second location that detect the structure.

Preferably, the location is held and is carried the structure and is included wide distance take-up board, auxiliary positioning board, first spring and the tight piece of adaptation clamp, the wide distance is welded with auxiliary positioning board from the bottom of taking-up board both sides, the welding of one side of auxiliary positioning board has first spring, the welding of the one end of first spring has the tight piece of adaptation clamp, the inboard and the detection that the tight piece of adaptation clamp hold the hose laminating.

Because the detection holds the hose and receives stress extrusion for the soil body forms local shrink and extrudes to the top, detects the diameter grow that holds the hose top, derives the adaptation and presss from both sides tight piece, utilizes the cooperation that the adaptation pressed from both sides tight piece and first spring, makes the shrink of first spring atress, drives the adaptation and presss from both sides tight piece and follows the detection and hold the hose to both sides expansion, and equivalent stress detection structure breaks away from when having avoided detecting and holding hose diameter grow.

Preferably, the coordination detection structure comprises a test internal rotating pipe, a pressure detector, a second spring and a stress derivation sliding rod, the pressure detector is fixedly connected to the top end of the test internal rotating pipe, the second spring is fixedly connected to the bottom end of the pressure detector, the stress derivation sliding rod is welded to the bottom end of the second spring, the stress derivation sliding rod is connected with the inner side of the test internal rotating pipe in a sliding mode, and the bottom end of the stress derivation sliding rod is connected with the second positioning auxiliary detection plate in a welding mode.

Preferably, the second positioning auxiliary detection plate and the first positioning auxiliary detection plate have the same structure, the first positioning auxiliary detection plate and the second positioning auxiliary detection plate respectively comprise a detection plate main body, a third hydraulic piston cylinder and a positioning locking bolt, the bottom ends of two sides of the detection plate main body are fixedly connected with the third hydraulic piston cylinder through screws, and the output end of the third hydraulic piston cylinder is fixedly connected with the positioning locking bolt.

Preferably, the material of the detection accommodating hose is transparent rubber.

The use method of the device for soil body fracture toughness and tensile strength is used for any one of the above steps:

the first step is as follows: inserting a quantitatively-shaped soil body into the detection accommodating hose, and clamping the equivalent stress detection structure at the top end of the detection accommodating hose through the positioning accommodating carrying structure;

the second step is that: the extrusion stress push blocks are positioned at the distance, height and angle which are properly tested by controlling derivation, and the first hydraulic piston cylinder is controlled to finish the derivation of the extrusion stress push blocks, so that the extrusion stress push blocks extrude the detection accommodating hose, the angle stress of the soil body in the detection accommodating hose is finished, and therefore sigma 1, sigma 2 and sigma 3 are formed;

the third step: the second positioning auxiliary detection plate is stressed to push the extrusion stress derivation slide rod due to the fact that the soil body is stressed and extruded to form surging derivation towards the top end, the stress derivation slide rod is utilized to push and extrude a second spring to finally form specific stress data at the pressure detector, and therefore sigma H is formed;

the fourth step: calculating specific fracture toughness according to a formula;

the fifth step: separating the equivalent stress detection structure from the detection containing hose, pouring out the original soil body in the detection containing hose, and inserting the detected soil body with the same weight body type as the first detection into the detection containing hose;

and a sixth step: controlling a third hydraulic piston cylinder in the second positioning auxiliary detection plate and the first positioning auxiliary detection plate to finish the derivation of a positioning locking bolt, so that the positioning locking bolt is inserted into the soil body to form the positioning of the top end and the bottom end of the soil body;

the seventh step: the second hydraulic piston cylinder is controlled to press down the output end, the magnetic suction port is started to be connected with the output end of the second hydraulic piston cylinder through magnetic suction, and the second hydraulic piston cylinder is utilized to drive the output end to reset to finish dragging the soil body in the detection accommodating hose;

eighth step: and continuously observing the change of the pressure value at the pressure detector before the soil body is not completely disconnected when observed from the outer side of the detection containing hose, thereby obtaining the equivalent stress numerical value of the tensile stress strength of the soil body.

Compared with the prior art, the invention has the beneficial effects that:

the device is convenient to automatically, accurately and controllably detect the tensile stress strength and the fracture toughness of the soil body with the specification through the integral design of the device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic diagram of a partial configuration of a configuration detection output structure according to the present invention;

FIG. 3 is a schematic diagram of a partial structure of an equivalent stress detection structure according to the present invention;

FIG. 4 is a partial schematic view of a positioning and accommodating mounting structure according to the present invention;

FIG. 5 is a schematic diagram of a partial configuration of a configuration detection structure according to the present invention;

FIG. 6 is a schematic view of a partial configuration of a first positioning auxiliary sensing plate and a second positioning auxiliary sensing plate of the present invention;

FIG. 7 is a schematic view of the integrated apparatus for detecting stress according to the present invention;

FIG. 8 is a graphical representation of the fracture toughness of the present invention.

In the figure: 1. detecting the accommodating hose; 2. coordinating the detection output structure; 3. a first positioning auxiliary detection plate; 4. an equivalent stress detection structure; 5. supporting the carrying plate; 6. a transverse guide block; 7. a first motor; 8. a screw; 9. a polish rod; 10. a push block is matched; 11. a rodless cylinder; 12. matching the carrying plate; 13. a second motor; 14. turning over the toggle block; 15. a first hydraulic piston cylinder; 16. extruding the stressed push block; 17. detecting a stroke carrying pipe; 18. a positioning, accommodating and carrying structure; 19. auxiliary carrying plates; 20. a second hydraulic piston cylinder; 21. a coordinating detection structure; 22. a second positioning auxiliary detection plate; 23. a magnetic suction interface; 24. carrying the plate in a wide distance; 25. an auxiliary positioning plate; 26. a first spring; 27. adapting to the clamping block; 28. testing the internal rotating pipe; 29. a pressure detector; 30. a second spring; 31. the slide bar is deduced under stress; 32. a detection board main body; 33. a third hydraulic piston cylinder; 34. and positioning and locking the bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

The first embodiment is as follows:

please refer to fig. 1:

the utility model provides a soil body fracture toughness and tensile strength's device, includes that the detection holds hose 1, moves detection output structure 2, first location auxiliary detection board 3 and equivalent stress detection structure 4, detects the first location auxiliary detection board 3 of the bottom fixedly connected with that holds hose 1, and the both sides fixedly connected with of first location auxiliary detection board 3 moves detection output structure 2 in coordination, detects the top fixedly connected with equivalent stress detection structure 4 that holds hose 1.

Please refer to fig. 2:

the matching detection output structure 2 comprises a supporting and carrying plate 5, a transverse guide block 6, a first motor 7, a screw rod 8, a polished rod 9 and a matching push block 10, wherein the transverse guide block 6 is welded at the top end of the supporting and carrying plate 5, the first motor 7 is fixedly connected with one end of the transverse guide block 6 through a screw, the screw rod 8 is fixedly connected with the output end of the first motor 7, the other end of the screw rod 8 is rotatably connected with the inner side of the transverse guide block 6, two polished rods 9 are also welded on the inner side of the transverse guide block 6, the polished rods 9 are positioned on two sides of the screw rod 8, the matching push block 10 is slidably connected with the outer side of the polished rod 9, and the inner side of the matching push block 10 is also connected with the screw rod 8 through threads;

the matching detection output structure 2 further comprises a rodless cylinder 11, a matching carrying plate 12, a second motor 13, a turning and stirring block 14, a first hydraulic piston cylinder 15 and an extrusion stress pushing block 16, wherein the top end of the matching pushing block 10 is fixedly connected with the rodless cylinder 11, one end of the rodless cylinder 11 is connected with a plurality of matching carrying plates 12 in a sliding mode, one side of each matching carrying plate 12 is fixedly connected with the second motor 13 through a screw, the output end of the second motor 13 is fixedly connected with the turning and stirring block 14, the other side of each turning and stirring block 14 is rotatably connected with the matching carrying plate 12, one end of each turning and stirring block 14 is fixedly connected with the first hydraulic piston cylinder 15 through a screw, and the output end of each first hydraulic piston cylinder 15 is fixedly connected with the extrusion stress pushing block 16;

the torque output to the screw rod 8 is completed by controlling the first motor 7, the screw rod 8 is rotated, the screw rod 8 is connected with the matching push block 10 through threads, the matching push block 10 obtains torque, the torque at the matching push block 10 is limited to form sliding displacement by utilizing the sliding connection of the matching push block 10 and the polished rod 9, the sliding displacement of the matching push block 10 is utilized to drive and adjust the transverse distance of the extrusion stress push block 16 close to the detection accommodating hose 1, at the moment, all the matching and carrying plates 12 are driven through the rodless cylinder 11, the heights of the extrusion stress push blocks 16 relative to the detection accommodating hose 1 are adjusted, the overturning and shifting block 14 is driven by utilizing the second motor 13 to rotate, the adjustment of the stress derivation angles of the extrusion stress push block 16 is completed, and after the adjustment is completed, the first hydraulic piston cylinder 15 is controlled to complete the derivation of the extrusion stress push block 16, so that the compression stressed push block 16 applies a plurality of main stresses to the detection containing hose 1;

please refer to fig. 3:

the equivalent stress detection structure 4 comprises a detection stroke carrying pipe 17, a positioning and accommodating carrying structure 18, an auxiliary carrying plate 19, a second hydraulic piston cylinder 20, a coordination detection structure 21, a second positioning auxiliary detection plate 22 and a magnetic suction interface 23, wherein the bottom end of the detection stroke carrying pipe 17 is fixedly connected with the positioning and accommodating carrying structure 18, one side of the detection stroke carrying pipe 17 is fixedly connected with the auxiliary carrying plate 19, the top end of the auxiliary carrying plate 19 is fixedly connected with the second hydraulic piston cylinder 20 through a screw, the output end of the second hydraulic piston cylinder 20 is magnetically connected with the magnetic suction interface 23, the bottom end of the magnetic suction interface 23 is fixedly connected with the second positioning auxiliary detection plate 22, the top end of the detection stroke carrying pipe 17 is fixedly connected with the coordination detection structure 21, and the bottom end of the coordination detection structure 21 is fixedly connected with the second positioning auxiliary detection plate 22;

please refer to fig. 4:

the positioning, accommodating and carrying structure 18 comprises a wide-distance carrying plate 24, an auxiliary positioning plate 25, a first spring 26 and an adaptive clamping block 27, wherein the auxiliary positioning plate 25 is welded at the bottom ends of the two sides of the wide-distance carrying plate 24, the first spring 26 is welded at one side of the auxiliary positioning plate 25, the adaptive clamping block 27 is welded at one end of the first spring 26, and the inner side of the adaptive clamping block 27 is attached to the detection accommodating hose 1;

the detection containing hose 1 is extruded by stress, so that a soil body is locally contracted and extruded towards the top end, the diameter of the top of the detection containing hose 1 is increased, the adaptive clamping block 27 is deduced, the first spring 26 is contracted by stress by utilizing the matching of the adaptive clamping block 27 and the first spring 26, the adaptive clamping block 27 is driven to expand towards two sides along with the detection containing hose 1, and the separation of the equivalent stress detection structure 4 when the diameter of the detection containing hose 1 is increased is avoided;

please refer to fig. 5-6:

the coordination detection structure 21 comprises a test internal rotating pipe 28, a pressure detector 29, a second spring 30 and a stress derivation slide bar 31, wherein the top end of the test internal rotating pipe 28 is fixedly connected with the pressure detector 29, the bottom end of the pressure detector 29 is fixedly connected with the second spring 30, the bottom end of the second spring 30 is welded with the stress derivation slide bar 31, the stress derivation slide bar 31 is in sliding connection with the inner side of the test internal rotating pipe 28, and the bottom end of the stress derivation slide bar 31 is in welding connection with a second positioning auxiliary detection plate 22;

the structure of the second positioning auxiliary detection plate 22 is completely the same as that of the first positioning auxiliary detection plate 3, the first positioning auxiliary detection plate 3 and the second positioning auxiliary detection plate 22 respectively comprise a detection plate main body 32, a third hydraulic piston cylinder 33 and a positioning locking bolt 34, the bottom ends of two sides of the detection plate main body 32 are respectively fixedly connected with the third hydraulic piston cylinder 33 through screws, and the output end of the third hydraulic piston cylinder 33 is fixedly connected with the positioning locking bolt 34;

the material of the detection containing hose 1 is transparent rubber.

Example two:

the use method of the device for soil body fracture toughness and tensile strength is used for the above embodiment, and comprises the following steps:

the first step is as follows: inserting a quantitatively-shaped soil body into the detection accommodating hose 1, and clamping the equivalent stress detection structure 4 at the top end of the detection accommodating hose 1 through the positioning accommodating carrying structure 18;

the second step is that: the extrusion stress push blocks 16 are in the distance, height and angle suitable for testing through controlled derivation, at the moment, the first hydraulic piston cylinder 15 is controlled to finish derivation of the extrusion stress push blocks 16, the extrusion stress push blocks 16 extrude the detection accommodating hose 1, the angle stress of the soil body in the detection accommodating hose 1 is finished, and therefore sigma 1, sigma 2 and sigma 3 are formed;

the third step: the surging derivation towards the top end is formed by the forced extrusion of the soil body, so that the second positioning auxiliary detection plate 22 is forced to push the extrusion stress derivation slide rod 31, the stress derivation slide rod 31 is utilized to push the extrusion second spring 30, and finally, concrete stress data is formed at the pressure detector 29, so that sigma H is formed;

the fourth step: according to the formula:

the first formula:

the second formula:

for those skilled in the art, the stress triaxial degree is taken as a fracture parameter, which not only can provide theoretical support for researching different fracture mechanisms macroscopically, but also can improve the accuracy of the toughness fracture criterion established from a microscopic angle. Therefore, the value of the triaxial stress degree is used for distinguishing the fracture mechanism, the reserved length a of the fracture toughness of the initial crack of the soil body is measured by replacing sigma in a second formula with eta, the fracture width of the fractured molded soil body is measured, the W of the fracture toughness is calculated, the shape parameter ya/W is calibrated by adopting finite element numerical calculation, and then the specific numerical value of the fracture toughness of the molded soil body 2 is calculated according to actual test data;

the fifth step: separating the equivalent stress detection structure 4 from the detection containing hose 1, pouring out the original soil body in the detection containing hose 1, and inserting the detected soil body with the same weight body type as the first detection into the detection containing hose 1;

and a sixth step: controlling a third hydraulic piston cylinder 33 inside the second positioning auxiliary detection plate 22 and the first positioning auxiliary detection plate 3 to finish the derivation of a positioning locking bolt 34, so that the positioning locking bolt 34 is inserted into the soil body to form the positioning of the top end and the bottom end of the soil body;

the seventh step: the second hydraulic piston cylinder 20 is controlled to press down the output end, the magnetic suction port 23 is started to be connected with the output end of the second hydraulic piston cylinder 20 through magnetic suction, and the second hydraulic piston cylinder 20 is utilized to drive the output end to reset to finish dragging the soil body in the detection accommodating hose 1;

eighth step: when the soil body is not completely disconnected when observed from the outer side of the detection containing hose 1, the change of the pressure value at the pressure detector 29 is continuously observed, and according to the mechanical balance theorem, the pressure value at the pressure detector 29 is known to be the tensile stress strength of the soil body, so that the equivalent stress value of the tensile stress strength of the soil body is obtained.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.