1. A model test device for response simulation of an in-service taut mooring system, comprising:

the device comprises a support frame, wherein a cyclic stress simulation device, a water tank and a fixed pulley are sequentially arranged on the support frame along the stress direction of a mooring rope to be tested;

the cyclic stress simulation device is connected with one end of the mooring cable to be tested and used for providing cyclic load for the mooring cable to be tested;

the water tank is used for simulating the marine water environment where the mooring rope to be tested is located, and is provided with an opening through which the mooring rope to be tested can pass;

the fixed pulley is arranged at the edge of the support frame and used for converting the direction of a mooring rope to be tested;

one end of the steel wire rope is connected to the tail end of the mooring rope to be tested through a first connecting piece, and the other end of the steel wire rope is connected to the anchor plate foundation mechanism to be tested through a second connecting piece;

the top end of the soil tank is opened, and an environment simulation material is arranged in the soil tank; the top end of the soil groove is lower than the fixed pulley; the anchor plate foundation structure to be tested is arranged in the environment simulation material;

the data acquisition device comprises a first displacement sensor for measuring the elongation of a mooring cable to be tested, a second displacement sensor for measuring the anchor displacement change, a first tension sensor for measuring the mooring cable to be tested, a second tension sensor for measuring the bearing capacity of the foundation structure of the anchor plate to be tested and a soil pressure sensor arranged in the soil tank and used for measuring the soil pressure in the soil tank.

2. The in-service taut mooring system response simulation model testing apparatus according to claim 1, wherein said cyclic force simulation apparatus comprises a control apparatus, a cyclic loading device drivingly connected to said control apparatus via a conveyor belt;

the control device is used for setting the average tension and the tension amplitude of the mooring rope to be tested and driving the conveyor belt through the rotating shaft at corresponding frequency and power;

the circular loading equipment comprises a disc rotationally connected with the conveyor belt, a guide rod rotationally connected with the edge of the disc and a sliding block movably connected with the guide rod; the sliding block is arranged on the horizontal sliding rail and is fixedly connected with one end of a mooring rope to be tested; the circular loading equipment drives the mooring rope to be tested to move back and forth by rotating the disc, so that the anchor plate foundation structure and the mooring rope to be tested are provided with circular loads.

3. The in-service taut mooring system response simulation model testing apparatus according to claim 1, wherein a guide rail and a T-shaped groove disposed on the guide rail are disposed below the soil trough, the soil trough can slide back and forth on the guide rail, and the fixed position is locked by the T-shaped groove on the guide rail after sliding.

4. The in-service taut mooring system response simulation model testing apparatus according to claim 1, wherein said soil box is made of transparent material.

5. The in-service taut mooring system response simulation model testing apparatus according to claim 1, wherein said anchor plate infrastructure comprises normal weighted anchors installed in the soil box.

6. The in-service taut mooring system response simulation model testing device according to claim 1, wherein said environmental simulation material comprises marine sand and/or marine clay.

7. A model test method for response simulation of in-service taut mooring system, characterized in that the model test apparatus according to any of claims 1-6 comprises the steps of:

a mooring rope to be tested is pulled from a connecting end of the circulating stress simulation device, passes through the water tank, bypasses the fixed pulley to convert the direction and is connected with a steel wire rope;

injecting seawater into the water tank until the mooring cable to be tested is submerged, installing the anchor plate foundation structure in the soil tank, and connecting the steel wire rope with the anchor plate foundation structure to be tested;

starting a cyclic stress simulation device, transmitting load to a steel wire rope through a mooring cable to be tested, further transmitting the load to an anchor plate foundation structure to be tested, and applying a cyclic load reciprocating up and down to the anchor plate foundation structure to be tested so as to simulate a running taut mooring system;

the elongation of the mooring rope to be tested is measured through the first displacement sensor, the anchor displacement change is measured through the second displacement sensor, the tension borne by the mooring rope to be tested is measured through the first tension sensor, the bearing capacity of the anchor plate foundation structure to be tested is measured through the second tension sensor, and the soil pressure in the soil tank is measured through the soil pressure sensor.

8. The model testing method of claim 7, further comprising adjusting the position of the soil box as required for the test to simulate different lengths of mooring lines to be tested.

9. The model test method of claim 7, further comprising: the force resisting the pull-out of the anchor plate foundation structure is changed by changing the embedding depth of the anchor plate foundation structure to be tested and the gravity of the environment simulation material.

Background

With the implementation of the ocean power strategy, various ocean floating structures (including floating oil and gas exploitation platforms, floating offshore wind turbines, wave energy power generation devices, offshore pastures, offshore airports and the like) are rapidly developed.

For a marine floating structure to be moored for a long period of time at a specific location, a safe, reliable, economically reasonable mooring system must be sought, as shown in fig. 1. The mooring system is critical to maintain the upper buoy in a given position. The mooring line is used as a connecting member of the upper floating body and the anchoring foundation, the embedded plate anchor is the root of the whole mooring system and is deeply embedded into the sea bottom, and the past test devices are all test simulation only paying attention to one process, such as anchor soil interaction, cable soil interaction and anchor cable interaction, and a test device capable of simulating the whole seabed soil-anchor-cable-circulating marine load is not established.

Therefore, in view of the above situation, it is necessary to develop a test device capable of simulating the structure of the ocean soil-normal bearing anchor-mooring cable-ocean floating body.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a model test device for response simulation of an in-service taut mooring system, which can simulate the whole seabed soil-anchor-cable-circulating marine load.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

in a first aspect, the present invention provides a model test apparatus for response simulation of an in-service taut mooring system, comprising:

the device comprises a support frame, wherein a cyclic stress simulation device, a water tank and a fixed pulley are sequentially arranged on the support frame along the stress direction of a mooring rope to be tested;

the cyclic stress simulation device is connected with one end of the mooring cable to be tested and used for providing cyclic load for the mooring cable to be tested;

the water tank is used for simulating the marine water environment where the mooring rope to be tested is located, and is provided with an opening through which the mooring rope to be tested can pass;

the fixed pulley is arranged at the edge of the support frame and used for converting the direction of a mooring rope to be tested;

one end of the steel wire rope is connected to the tail end of the mooring rope to be tested through a first connecting piece, and the other end of the steel wire rope is connected to the anchor plate foundation mechanism to be tested through a second connecting piece;

the top end of the soil tank is opened, and an environment simulation material is arranged in the soil tank; the top end of the soil groove is lower than the fixed pulley; the anchor plate foundation structure to be tested is arranged in the environment simulation material;

the data acquisition device comprises a first displacement sensor for measuring the elongation of a mooring cable to be tested, a second displacement sensor for measuring the anchor displacement change, a first tension sensor for measuring the mooring cable to be tested, a second tension sensor for measuring the bearing capacity of the foundation structure of the anchor plate to be tested and a soil pressure sensor arranged in the soil tank and used for measuring the soil pressure in the soil tank.

Furthermore, the circulating stress simulation device comprises a control device and circulating loading equipment in transmission connection with the control device through a conveyor belt; the control device is used for setting the average tension and the tension amplitude of the mooring rope to be tested and driving the conveyor belt through the rotating shaft at corresponding frequency and power; the circular loading equipment comprises a disc rotationally connected with the conveyor belt, a guide rod rotationally connected with the edge of the disc and a sliding block movably connected with the guide rod; the sliding block is arranged on the horizontal sliding rail and is fixedly connected with one end of a mooring rope to be tested; the circular loading equipment drives the mooring rope to be tested to move back and forth by rotating the disc, so that the anchor plate foundation structure and the mooring rope to be tested are provided with circular loads.

Further, soil box below is provided with the guide rail and sets up the T type groove on the guide rail, soil box can make a round trip to slide on the guide rail, carries out the dead fixed position of lock through the T type groove on the guide rail after the slip.

Further, the soil tank is made of transparent materials.

Further, the anchor plate foundation structure comprises a normal force-bearing anchor, and the normal force-bearing anchor is installed in the soil tank.

Further, the environment simulation material comprises marine sand and/or marine clay.

In a second aspect, the present invention provides a model test method for response simulation of an in-service taut mooring system, based on the model test apparatus of the first aspect, including the following steps:

a mooring rope to be tested is pulled from a connecting end of the circulating stress simulation device, passes through the water tank, bypasses the fixed pulley to convert the direction and is connected with a steel wire rope;

injecting seawater into the water tank until the mooring cable to be tested is submerged, installing the anchor plate foundation structure in the soil tank, and connecting the steel wire rope with the anchor plate foundation structure to be tested;

starting a cyclic stress simulation device, transmitting load to a steel wire rope through a mooring cable to be tested, further transmitting the load to an anchor plate foundation structure to be tested, and applying a cyclic load reciprocating up and down to the anchor plate foundation structure to be tested so as to simulate a running taut mooring system;

the elongation of the mooring rope to be tested is measured through the first displacement sensor, the anchor displacement change is measured through the second displacement sensor, the tension borne by the mooring rope to be tested is measured through the first tension sensor, the bearing capacity of the anchor plate foundation structure to be tested is measured through the second tension sensor, and the soil pressure in the soil tank is measured through the soil pressure sensor.

Further, the method further comprises: the position of the soil tank is adjusted according to the test requirement, so that the purpose of simulating different mooring rope sample lengths is achieved.

Further, the method further comprises: the force resisting the pull-out of the anchor plate foundation structure is changed by changing the embedding depth of the anchor plate foundation structure to be tested and the gravity of the environment simulation material.

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

1. the invention can simulate the whole seabed soil-anchor-cable-circulation sea and obtain the load through the simulation equipment, the displacement sensor and the tension sensor, and provides a new technical means and a new structural form for the test exploration of a deep and far sea mooring system, so that the proposed device has wide application prospect and extremely important engineering application value;

2. the invention can simulate the dynamic response of the tension mooring system in operation in ocean engineering in real time, is beneficial to observing and evaluating the safety and reliability of the tension mooring system from a laboratory, and can be used for researching the operation mechanism and failure damage mechanism of the actual tension mooring system in service, thereby being beneficial to improving the design level of the tension mooring system in China and constructing the safety guarantee technology of the tension mooring system, and further laying a test technology for the research and development of the tension mooring system in deep and distant sea in China, so that the proposed device has wide application prospect and extremely important engineering application value.

Drawings

FIG. 1 is a system of the invention consisting of ocean soil-normal bearing anchor-mooring cable-ocean floating body in a taut mooring project;

FIG. 2 is a front view of a model test apparatus of the present invention;

fig. 3 is a plan view of the model testing apparatus of the present invention.

In the figure:

1. a ground surface; 2. a support frame; 3. a control device; 4. a conveyor belt; 5. a cyclic loading device; 51. a disc; 52. a guide bar; 53. a slider; 54. a slideway; 6. a cable; 7. a water tank; 8. seawater; 9. a fixed pulley; 10. a first connecting member; 11. a wire rope; 12. a second connecting member; 13. an anchor plate foundation structure; 14. marine sand or marine clay; 15. a first displacement sensor; 16. a second displacement sensor; 17. A first tension sensor; 18. a second tension sensor; 19. a soil tank; 20. an earth pressure sensor.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present embodiment.

The first embodiment is as follows:

the embodiment provides a model test device for response simulation of an in-service taut mooring system, which comprises: the device comprises a support frame 2, wherein a cyclic stress simulation device, a water tank 7 and a fixed pulley 9 are sequentially arranged on the support frame 2 along the stress direction of a mooring rope 6 to be tested; the cyclic stress simulation device is connected with one end of the mooring rope 6 to be tested and is used for providing cyclic load for the mooring rope 6 to be tested; the water tank 7 can be penetrated by the mooring rope 6 to be tested, and seawater 8 is filled in the water tank 7 and used for simulating the ocean water environment where the mooring rope 6 to be tested is located; the fixed pulley 9 is arranged at the edge of the support frame 2 and used for converting the direction of the mooring rope 6 to be tested; one end of a steel wire rope 11 is connected to the tail end of the mooring rope 6 to be tested through a first connecting piece 10, and the other end of the steel wire rope is connected to the anchor plate foundation mechanism to be tested through a second connecting piece 12; the soil tank 19 is hollow, the top end of the soil tank 19 is open, an environment simulation material is arranged in the soil tank, and the top end of the soil tank 19 is lower than the fixed pulley 9; the anchor plate foundation structure 13 to be tested is arranged in the environment simulation material; the data acquisition device comprises a first displacement sensor 15 for measuring the elongation of the mooring rope 6 to be tested, a second displacement sensor 16 for measuring the anchor displacement change, a first tension sensor 17 for measuring the mooring rope 6 to be tested, a second tension sensor 18 for measuring the bearing capacity of the anchor plate foundation structure 13 to be tested and an earth pressure sensor 20 arranged in the earth groove 19 and used for measuring the earth pressure in the earth groove 19.

The implementation principle is as follows: the anchor plate and the mooring rope 6 are provided with cyclic loading through a cyclic stress simulation device, the cyclic stress simulation device is provided with a control device 3 which can set the average tension and the tension amplitude of the mooring rope, and the mooring rope 6 is pulled out from the connecting end of the cyclic loading device 5, passes through the water tank 7, bypasses the fixed pulley 9, changes the direction and is connected with the steel wire rope 11. The wire rope 11 is then connected to an anchor plate foundation structure 13 (normal force anchor) which anchor plate foundation structure 13 (normal force anchor) has been installed in the environment of a soil trough 19 of a certain soil depth. It is thus possible to impart a pulling force to the anchor plate infrastructure 13 (normal load bearing anchor) against the pulling of the mooring line 6 by the depth of the buried soil and the gravity of the soil, so that the anchor plate infrastructure 13 (normal load bearing anchor) has a force against the pulling. Through the test device, not only can the tension and displacement response of the mooring cable 6 under the ocean cyclic load be researched, but also the dynamic response of the anchor plate foundation structure 13 (normal bearing anchor) and the soil body can be researched.

Example two:

the embodiment provides a model test device for response simulation of an in-service taut mooring system, which comprises a loading device consisting of 4 aspects, namely ocean soil-normal bearing anchor-mooring cable-which can apply ocean wave load, as shown in fig. 2-3.

The device specifically comprises: the device comprises a support frame 2 arranged on the ground 1, a control device 3 arranged on the support frame 2, a conveyor belt 4, a circulating loading device 5, a marine water environment box 7 for simulating the mooring rope, and a fixed pulley 9 arranged at the edge of the support frame 2 and used for converting the direction of the mooring rope 6.

One end of a steel wire rope 11 is connected to the tail end of the mooring rope 6 to be tested through a first connecting piece 10, the other end of the steel wire rope is connected to an anchor plate foundation mechanism to be tested through a second connecting piece 12, the anchor plate foundation mechanism to be tested is pre-arranged in a soil tank 19 and covered with ocean sandy soil 14 with a certain depth so as to simulate the dynamic response of an anchor plate foundation structure 13 (normal bearing anchor) and a soil body.

General protocol of the test apparatus: generally speaking, the anchor plate and the mooring rope 6 are provided with cyclic loading through a cyclic stress simulation device, the cyclic stress simulation device is provided with a control device 3 which can set the average tension and the tension amplitude of the mooring rope, and the mooring rope 6 is pulled from the connecting end of the cyclic loading device 5, passes through the water tank 7 and then is connected with a steel wire rope 11. Then, after the direction of the steel wire rope 11 is changed around the fixed pulley 9, the steel wire rope 11 and the anchor plate foundation structure 13 (normal bearing anchor) are connected, and the anchor plate foundation structure 13 (normal bearing anchor) is noticed to be installed in the soil groove 19 environment with certain soil depth. It is thus possible to impart a pulling force to the anchor plate infrastructure 13 (normal load bearing anchor) against the pulling of the mooring line 6 by the depth of the buried soil and the gravity of the soil, so that the anchor plate infrastructure 13 (normal load bearing anchor) has a force against the pulling. Through the test device, not only can the tension and displacement response of the mooring cable 6 under the ocean cyclic load be researched, but also the dynamic response of the anchor plate foundation structure 13 (normal bearing anchor) and the soil body can be researched.

The mooring rope 6 is provided with a first tension sensor 17 for measuring the tension of the mooring rope 6, and the tail end of the first tension sensor is fixedly connected with the steel wire rope 11 through the first connecting piece 10.

One end of a steel wire rope 11 is connected to the tail end of the mooring rope 6 to be tested through a first connecting piece 10, and the other end of the steel wire rope is connected to the anchor plate foundation mechanism to be tested through a second connecting piece 12. On which a second displacement sensor 16 for measuring anchor displacement changes and a first tension sensor 17 for measuring the bearing capacity that the anchor plate can bear are arranged.

The cyclic stress simulation device is connected with one end of the mooring rope 6 to be tested and is used for providing cyclic load for the mooring rope 6 to be tested; the circulating stress simulation device comprises a control device 3 and circulating loading equipment 5 in transmission connection with the control device 3 through a conveyor belt 4; the control device 3 is used for setting the average tension and the tension amplitude of the mooring rope 6 to be tested, and driving the conveyor belt 4 through a rotating shaft at corresponding frequency and power; the cyclic loading device 5 comprises a disc 51 rotationally connected with the conveyor belt 4, a guide rod 52 rotationally connected with the edge of the disc 51 and a slide block 53 movably connected with the guide rod 52; the sliding block 53 is arranged on the horizontal slideway 54 and is fixedly connected with one end of the mooring cable 6 to be tested; the cyclic loading device 5 drives the mooring cable 6 to be tested to move back and forth by rotating the disc 51, so as to provide cyclic loading for the anchor plate foundation structure 13 and the mooring cable 6 to be tested.

The water tank 7 can be penetrated by the mooring rope 6 to be tested, and seawater 8 is filled in the water tank to simulate the ocean water environment where the mooring rope 6 to be tested is located; the part of the mooring line 6 that is arranged in the water tank 7 is provided with a first displacement sensor 15 for measuring the elongation of the mooring line 6 to be tested.

The soil tank 19 is hollow, the top end of the soil tank 19 is open, an environment simulation material is arranged in the soil tank, and the top end of the soil tank 19 is lower than the fixed pulley 9; the anchor plate foundation structure 13 to be tested is arranged in the environment simulation material; the guide rail and the T-shaped groove arranged on the guide rail are arranged below the soil groove 19, the soil groove 19 can slide back and forth on the guide rail, the fixed position is locked through the T-shaped groove on the guide rail after the soil groove 19 slides, and the purpose of adjusting the lengths of different mooring rope samples is achieved. The soil tank 19 is made of transparent materials, so that the process observation is more visual and clear. The soil tank 19 is also provided with a soil pressure sensor 20 for measuring the soil pressure in the soil tank 19. The environmental modeling material includes marine sand 14. The anchor plate infrastructure 13 includes a normal force bearing anchor mounted in a soil trough 19 of a certain depth.

The specific working method of the embodiment is as follows:

1. firstly, providing cyclic loading for a mooring cable 6 according to a cyclic stress simulation device (namely a control device 3, a conveyor belt 4 and cyclic loading equipment 5);

2. the load can be transferred to the steel wire rope 11 through the mooring cable 6 by the cyclic load output by the cyclic stress simulation device, and then transferred to the anchor plate foundation, and the cyclic load reciprocating up and down is applied to the anchor plate, so that a tension type mooring system running in actual ocean engineering can be simulated;

3. the tension force born by the mooring cable 6 and the uplift bearing capacity provided by the anchor plate are measured through the force sensor, and the elongation of the marked section of the mooring cable 6 and the total displacement variation of the anchor plate are measured through the stay wire displacement sensor.

4. The change of the soil body is measured by the soil pressure measuring sensor 20.

5. In addition, the soil groove 19 made of organic glass can slide back and forth on the guide rail, and is locked through the T-shaped groove on the guide rail after sliding, so that the purpose of adjusting the lengths of different mooring rope samples is achieved, namely the adopted soil groove 19 can adjust the position according to the test requirement, and therefore the tightening system formed by the mooring rope and the anchor in the test process can be ensured to be capable of completely simulating and simulating the state in the actual service process.

Example three:

the embodiment provides a model test method for response simulation of an in-service taut mooring system, and the model test device based on the embodiment II comprises the following steps:

a mooring rope 6 to be tested is pulled from a connecting end of the cyclic stress simulator, passes through the water tank 7, bypasses the fixed pulley 9, changes direction and is connected with a steel wire rope 11;

injecting seawater 8 into the water tank 7 until the mooring rope 6 to be tested is submerged, installing the anchor plate foundation structure 13 in a soil groove 19 with a certain depth, and connecting the steel wire rope 11 with the anchor plate foundation structure 13 to be tested;

starting a cyclic stress simulation device, transmitting load to a steel wire rope 11 through a mooring cable 6 to be tested, further transmitting the load to an anchor plate foundation structure 13 to be tested, and applying a cyclic load reciprocating up and down to the anchor plate foundation structure 13 to be tested so as to simulate a running taut mooring system;

the elongation of the mooring rope 6 to be tested is measured by a first displacement sensor 15, the anchor displacement change is measured by a second displacement sensor 16, the tension borne by the mooring rope 6 to be tested is measured by a first tension sensor 17, the bearing capacity of the anchor plate foundation structure 13 to be tested is measured by a second tension sensor 18, and the soil pressure in a soil tank 19 is measured by a soil pressure sensor 20;

the soil groove 19 slides back and forth on the guide rail, and is locked through a T-shaped groove on the guide rail after sliding, so that the purpose of simulating different mooring rope sample lengths is achieved;

the pull-out resistance of the anchor slab foundation structure 13 is changed by changing the depth of embedment of the anchor slab foundation structure 13 to be tested and the weight of the environmental simulation material.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.