1. A light two-ash soil roadbed construction method based on solid waste utilization is characterized by comprising the following steps:

foundation treatment: leveling the surface of the foundation, paving an anti-seepage geotextile layer on the foundation, paving a gravel cushion layer on the anti-seepage geotextile layer, and paving a water-seepage geotextile layer on the gravel cushion layer;

a drainage treatment step: paving a gravel cushion layer, and arranging waterproof ditches on two sides of the gravel cushion layer;

layered pouring: the method comprises the following steps of pouring a lower-layer foamed light soil layer, a middle-layer foamed light soil layer and an upper-layer foamed light soil layer on a gravel cushion layer in a layered mode, wherein the densities of the lower-layer foamed light soil layer, the middle-layer foamed light soil layer and the upper-layer foamed light soil layer are different, and fiber net layers are laid between adjacent layers;

tensioning treatment: tensioning the geocell, wherein in the tensioning process, the strength detection values of the welding points and the riveting points of each geocell are both more than 150N/cm;

filling treatment: fixing the geocell in the upper foam light soil layer;

moisture preservation and maintenance: and paving a waterproof geotechnical cloth layer on the upper-layer foam light soil layer, and after construction is finished, performing moisture preservation and maintenance.

2. The light-weight two-ash soil roadbed construction method based on solid waste utilization is characterized in that the layered pouring step specifically comprises the following steps: pouring a lower layer foam light soil layer, a middle layer foam light soil layer and an upper layer foam light soil layer on the gravel cushion layer in a layered manner, wherein the lower layer foam light soil layer adopts a wet density of 650kg/m³-850kg/m³The foam light-weight two-lime soil is poured, and the foam light-weight soil layer in the middle layer adopts the wet density of 850kg/m³-950kg/m³The foamed light-weight two-lime soil is poured, and the upper foamed light-weight soil layer adopts the wet density of 1200kg/m³-1300 kg/m³The foam light-weight two-ash soil is poured, and fiber mesh layers are paved between adjacent layers.

3. The light-weight two-ash soil roadbed construction method based on solid waste utilization is characterized in that in the layered pouring step, the foamed light-weight two-ash soil comprises the following components in percentage by mass: 1 to 6 percent of spherical EPS polystyrene foam, 5 to 8 percent of lime, 10 to 25 percent of fly ash and 4 to 10 percent of water glass.

4. The light-weight two-ash soil roadbed construction method based on solid waste utilization is characterized in that the filling treatment step specifically comprises the following steps: and fixing the geocell on the surface of the upper foam light soil layer, and filling the geocell with foam light two-ash soil with the density same as that of the upper foam light soil layer to form the geocell reinforced light soil layer.

5. The method for constructing a light-weight two-ash soil roadbed based on solid waste utilization according to claim 1, wherein in the tensioning treatment step, the geocell is in a three-dimensional grid structure formed by riveting a plurality of reinforcing strips and a plurality of anchoring elements.

6. The construction method of a light-weight two-ash soil roadbed based on solid waste utilization according to claim 5, wherein in the tensioning treatment step, the 'reinforcing strips' are made of polyethylene terephthalate.

7. The construction method of a light-weight two-ash soil roadbed based on solid waste utilization is characterized in that in the tensioning treatment step, the outside of the anchoring piece is wrapped with protective plastic.

8. The construction method of the light-weight two-ash soil roadbed based on solid waste utilization is characterized in that the drainage treatment step specifically comprises the following steps: when the gravel cushion layer is paved, waterproof ditches are arranged on two sides of the gravel cushion layer, and gravel is filled in the waterproof ditches.

9. The method for constructing a light-weight two-ash soil roadbed based on solid waste utilization according to claim 1, wherein in the foundation treatment step, the anti-seepage geotextile layer and the water-seepage geotextile layer are both made of synthetic fibers.

10. The construction method of a light-weight two-ash soil roadbed based on solid waste utilization according to claim 1, wherein in the step of moisture-retaining maintenance, the waterproof geotextile layer is polyethylene geotextile or polyvinyl chloride geotextile.

Background

The soft soil is widely distributed, the soft soil foundation is easy to settle due to the overlying load in the engineering construction, so that the roadbed structure is easy to destabilize, the light soil is adopted as the filling material, the upper filling load can be reduced, the additional stress of the soft foundation is reduced, a new technical means is provided for solving the engineering problem, and the method is widely applied to the aspects of soft soil foundation, abutment back filling, engineering backfilling and the like at the present stage. However, in the prior art, the conventional construction method of the soft soil roadbed generally has higher construction difficulty, longer construction period and higher construction cost, and has certain limitations.

Disclosure of Invention

Aiming at the technical problems, the invention provides a light-weight two-ash soil roadbed construction method based on solid waste utilization, which aims to solve the problems that the conventional soft soil roadbed construction method in the prior art is generally higher in construction difficulty, longer in construction period, higher in construction cost and limited to a certain extent.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a light two-ash soil roadbed construction method based on solid waste utilization, which comprises the following steps:

foundation treatment: leveling the surface of the foundation, paving an anti-seepage geotextile layer on the foundation, paving a gravel cushion layer on the anti-seepage geotextile layer, and paving a water-seepage geotextile layer on the gravel cushion layer;

a drainage treatment step: paving a gravel cushion layer, and arranging waterproof ditches on two sides of the gravel cushion layer;

layered pouring: the method comprises the following steps of pouring a lower-layer foamed light soil layer, a middle-layer foamed light soil layer and an upper-layer foamed light soil layer on a gravel cushion layer in a layered mode, wherein the densities of the lower-layer foamed light soil layer, the middle-layer foamed light soil layer and the upper-layer foamed light soil layer are different, and fiber net layers are laid between adjacent layers;

tensioning treatment: tensioning the geocell, wherein in the tensioning process, the strength detection values of the welding points and the riveting points of each geocell are both more than 150N/cm;

filling treatment: fixing the geocell in the upper foam light soil layer;

moisture preservation and maintenance: and paving a waterproof geotechnical cloth layer on the upper-layer foam light soil layer, and after construction is finished, performing moisture preservation and maintenance.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization, and further the layered pouring steps are as follows: pouring a lower layer foam light soil layer, a middle layer foam light soil layer and an upper layer foam light soil layer on the gravel cushion layer in a layered manner, wherein the lower layer foam light soil layer adopts a wet density of 650kg/m³-850kg/m³The foam light-weight two-lime soil is poured, and the foam light-weight soil layer in the middle layer adopts the wet density of 850kg/m³-950kg/m³The foamed light-weight two-lime soil is poured, and the upper foamed light-weight soil layer adopts the wet density of 1200kg/m³-1300kg/m³The foam light-weight two-ash soil is poured, and fiber mesh layers are paved between adjacent layers.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization, and further in the step of layered pouring, the foamed light two-ash soil comprises the following components in percentage by mass: 1 to 6 percent of spherical EPS polystyrene foam, 5 to 8 percent of lime, 10 to 25 percent of fly ash and 4 to 10 percent of water glass.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization, further, the filling treatment steps are as follows: and fixing the geocell on the surface of the upper foam light soil layer, and filling the geocell with foam light two-ash soil with the density same as that of the upper foam light soil layer to form the geocell reinforced light soil layer.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization, and further the drainage treatment steps are as follows: when the gravel cushion layer is paved, waterproof ditches are arranged on two sides of the gravel cushion layer, and gravel is filled in the waterproof ditches.

The invention provides a light-weight two-ash soil roadbed construction method based on solid waste utilization.

The light-weight two-ash soil roadbed construction method based on solid waste utilization further comprises the step of moisturizing and maintaining, wherein the waterproof geotextile layer is polyethylene geotextile or polyvinyl chloride geotextile.

The technical scheme has the following advantages or beneficial effects:

the invention provides a light two-ash soil roadbed construction method based on solid waste utilization, which comprises the following steps: the method comprises the steps of foundation treatment, drainage treatment, layered pouring, tensioning treatment, filling treatment and moisturizing maintenance. On one hand, the invention inherits the advantages of light soil for pouring the roadbed, has small required operation area, does not need large-scale equipment, does not need rolling vibration during construction, has small construction difficulty and overcomes the problem that the roadbed is not compact by rolling and tamping in the filling process; on the other hand, a lower-layer foamed light soil layer, a middle-layer foamed light soil layer and an upper-layer foamed light soil layer with different densities are respectively poured in a layered pouring mode, the density of each foamed light soil layer can be adaptively changed according to the actual engineering during construction, and compared with a roadbed which is completely poured by light soil, the roadbed has higher controllability and applicability; in addition, the upper layer is filled with geocell reinforced light soil, so that the thickness of an overlying soil layer can be effectively reduced to a certain extent while the bearing strength of the roadbed is ensured, and the construction period and the cost are further reduced; meanwhile, the geocell adopts a stress tensioning process, so that the lateral resistance effect is improved to a greater extent, the plastic deformation of the pavement is reduced by 30-50%, the elastic modulus is improved by 40-50%, the phenomena of greater deflection and deformation of the roadbed are avoided, and further, the reduction of the continuous settlement rate caused by the cyclic load is facilitated.

Drawings

The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a schematic partial flow chart of a light-weight two-ash soil roadbed construction method based on solid waste utilization provided by embodiment 1 of the invention;

FIG. 2 is a schematic diagram of a partial structure of a roadbed structure cross section formed by the light-weight two-ash roadbed construction method based on solid waste utilization provided by the embodiment 1 of the invention;

fig. 3 is a schematic structural diagram of a single geocell in the light-weight two-ash soil roadbed construction method based on solid waste utilization provided by the embodiment 1 of the invention.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention are clearly and completely described 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 embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, belong to the protection scope of the invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

the soft soil is widely distributed, the soft soil foundation is easy to settle due to the overlying load in the engineering construction, so that the roadbed structure is easy to destabilize, the light soil is adopted as the filling material, the upper filling load can be reduced, the additional stress of the soft foundation is reduced, a new technical means is provided for solving the engineering problem, and the method is widely applied to the aspects of soft soil foundation, abutment back filling, engineering backfilling and the like at the present stage. However, in the prior art, the conventional construction method of the soft soil roadbed generally has higher construction difficulty, longer construction period and higher construction cost, and has certain limitations.

In order to solve the above technical problems, an embodiment 1 of the present invention provides a light-weight two-ash soil roadbed construction method based on solid waste utilization, as shown in fig. 1, including the following steps:

a foundation treatment step S101: leveling the surface of the foundation, paving an anti-seepage geotextile layer 11 on the foundation, paving a broken stone cushion layer 12 on the anti-seepage geotextile layer 11, and paving a water-seepage geotextile layer 13 on the broken stone cushion layer 12; specifically, the thickness of the crushed stone pad 12 is 100 mm;

a drainage processing step S102: when the gravel cushion layer 12 is paved, waterproof ditches 111 are arranged on two sides of the gravel cushion layer 12;

a layered casting step S103: pouring a lower-layer foam light soil layer 14, a middle-layer foam light soil layer 15 and an upper-layer foam light soil layer 16 on the gravel cushion layer 12 in a layered manner, wherein the densities of the lower-layer foam light soil layer 14, the middle-layer foam light soil layer 15 and the upper-layer foam light soil layer 16 are different, and fiber mesh layers 110 are paved among adjacent layers; specifically, the thickness of the lower foamed light soil layer 1414 is 500mm-600 mm; the thickness of the middle layer of foamed light soil is 200mm-300mm, and the thickness of the upper layer of foamed light soil is 400mm-600 mm; each fiber net layer 110 is composed of impermeable geotextile, and is fixed between adjacent foam light soil layers through a metal net and an anchor rod, and the metal net adopts a galvanized wire netting, so that the phenomena of local slippage between the adjacent foam light soil layers, interlocking type sliding between the soil layers and the like can be effectively avoided, the bonding firmness between the adjacent soil layers is improved, and the overall structural strength of the roadbed is further improved.

Tension processing step S104: tensioning the geocell, wherein in the tensioning process, the strength detection values of the welding points and the riveting points of each geocell are both more than 150N/cm;

filling processing step S105: fixing the geocell in the upper foam light soil layer 16;

a moisturizing and maintaining step S106: and paving a waterproof geotechnical cloth layer 18 on the upper foamed light soil layer 16, and after construction is finished, performing moisture preservation and maintenance.

The invention provides a light two-ash soil roadbed construction method based on solid waste utilization, which realizes the construction of a light two-ash soil roadbed structure 1 based on solid waste utilization through the steps, wherein the specific roadbed structure in the embodiment is shown in the attached drawing 2 and comprises an anti-seepage geotextile layer 11, a gravel cushion layer 12, a water seepage geotextile layer 13, a lower layer foam lightweight soil layer 14, a middle layer foam lightweight soil layer 15, an upper layer foam lightweight soil layer 16, a geocell reinforcement lightweight soil layer 17, a waterproof geotextile layer 18 and a side slope 19 which are sequentially paved in a trapezoidal shape from bottom to top; the side slope 19 extends from the anti-seepage geotextile layer 11 to the waterproof geotextile layer 18, and the side slope 19 is distributed on two sides of the anti-seepage geotextile layer 11, the broken stone cushion layer 12, the water-seepage geotextile layer 13, the lower layer foam light soil layer 14, the middle layer foam light soil layer 15, the upper layer foam light soil layer 16, the geocell reinforcement light soil layer 17 and the waterproof geotextile layer 18 and inclines outwards; the geocell reinforced light soil layer 17 is arranged in the upper foamed light soil layer 16; specifically, the slope of the roadbed slope 19 in the present embodiment is 1: 1.5.

on one hand, the invention inherits the advantages of light soil for pouring the roadbed, has small required operation area, does not need large-scale equipment, does not need rolling vibration during construction, has small construction difficulty and overcomes the problem that the roadbed is not compact by rolling and tamping in the filling process; on the other hand, the lower-layer foam light soil layer 14, the middle-layer foam light soil layer 15 and the upper-layer foam light soil layer 16 which are different in density are respectively poured in a layered pouring mode, the density of each layer of foam light soil layer can be adaptively changed according to the actual engineering during construction, and compared with a roadbed which is completely poured by adopting light soil, the roadbed is higher in controllability and applicability; in addition, the upper layer is filled with geocell reinforced light soil, so that the thickness of an overlying soil layer can be effectively reduced to a certain extent while the bearing strength of the roadbed is ensured, and the construction period and the cost are further reduced; meanwhile, the geocell adopts a stress tensioning process, so that the lateral resistance effect is improved to a greater extent, the plastic deformation of the road surface is reduced by 30-50%, the elastic modulus is improved by 40-50%, and the phenomena of greater deflection and deformation of the roadbed and the like are avoided, so that the reinforcement constraint force of the geocell on the soil body is improved, and further, the continuous settlement rate caused by cyclic load is favorably reduced. Therefore, the light-weight two-ash soil roadbed construction method based on solid waste utilization is simple in construction and convenient and fast to maintain, and effectively solves the problems that a conventional soft soil roadbed construction method in the prior art is large in construction difficulty, long in construction period, high in construction cost and limited to a certain extent.

In order to solve the problem of lack of highway construction resources and high-quality construction materials, the light-weight two-ash soil roadbed construction method based on solid waste utilization provided by the embodiment further includes the step S103 of layered pouring: a lower layer foam light soil layer 14, a middle layer foam light soil layer 15 and an upper layer foam light soil layer 16 are poured on the gravel cushion layer 12 in a layered mode, wherein the lower layer foam light soil layer 14 adopts a wet density of 650kg/m³-850kg/m³The foam light-weight two-lime soil is poured, and the foam light-weight soil layer 15 in the middle layer adopts the wet density of 850kg/m³-950kg/m³The upper foamed light soil layer 16 is formed by pouring foamed light two-lime soil, and the wet density is 1200kg/m³-1300kg/m³The foam light-weight lime-clay is poured, and fiber mesh layers 110 are paved between adjacent layers. The foam light-weight two-ash soil comprises the following components in percentage by mass: 1 to 6 percent of spherical EPS polystyrene foam, 5 to 8 percent of lime, 10 to 25 percent of fly ash and 4 to 10 percent of water glass.

The strength of each layer of foamed lightweight soil was measured by the unconfined compressive strength test, and the peak stress of the stress-strain curve was taken as the unconfined compressive strength, and the results are shown in table 1:

TABLE 1 foam light two-lime soil unconfined compressive strength values (kPa) of different ages

As can be seen from Table 1, the unconfined compressive strength of the foamed light lime-clay soil for roadbed meets the current road roadbed design Specification (JTG D30-2015).

In the prior art, in the highway engineering construction, a large amount of natural resources are needed for constructing the roadbed and the base course by adopting a traditional method, the natural environment is seriously damaged by blasting mountain stones and digging a river to take sand, and the original gravel materials can not meet the increasing requirements of the engineering construction, so that the problems of large resource investment, serious waste and the like are caused. Therefore, by utilizing the lime, the fly ash, the waste foam and other bulk solid wastes in the roadbed material, on one hand, the problem of environmental pollution caused by the waste solid materials can be effectively solved, the recovery and the cyclic utilization of the waste solid materials are realized, meanwhile, the serious damage of mining stones to the ecology is reduced, and the pollution to the environment is further reduced; on the other hand, the method can also reduce the source problem of highway engineering construction materials to a greater extent, and further solve the problem that highway construction resources and high-quality construction materials are deficient. In addition, because the lower foamed light soil layer 14, the middle foamed light soil layer 15 and the upper foamed light soil layer 16 are all formed by filling lightweight and high-strength fillers in a layered mode, the settlement value of the foundation caused by additional stress generated by the fillers is reduced, and the bearing strength of the roadbed is further improved.

In order to further improve the stability of the roadbed structure, the light-weight two-ash roadbed construction method based on solid waste utilization provided in this embodiment further includes the following concrete steps: fixing the geocell on the surface of the upper foamed light soil layer 16, and using the same density as the upper foamed light soil layer 16, namely the wet density of 1200kg/m³-1300kg/m³The foam light-weight two-ash soil is filled to form a geocell reinforced light soil layer 17. Specifically, the thickness of the geocell reinforced light soil layer 17 is 10cm, and only one layer is laid. Similarly, geotechnological check room adds muscle light soil layer 17 adopts the two grey soil fill of foam light that are the same with the wet density of upper foam light soil layer 16 to fill, compares in traditional road bed filler, not only can alleviate the dead weight of road bed effectively, and its compressibility is little, concreties soon, can also reduce the internal stress of road bed by a wide margin to avoid the problem that the road bed subsides effectively, further make the structure of road bed more stable.

In order to further improve the bearing strength of the roadbed, the light-weight two-ash soil roadbed construction method based on solid waste utilization provided by the embodiment further includes a tensioning treatment step S104, wherein the number of the geocells is largeThe rib belts are riveted with the anchoring parts to form a three-dimensional grid structure; "Rib" is made of high strength PET, i.e., polyethylene terephthalate; the outside of the anchoring piece is wrapped with protective plastic. The rib belts and the anchoring parts are riveted to form a latticed three-dimensional structure, so that the bearing strength of the geocell reinforced light soil layer 17 is improved, and the integral bearing strength of the roadbed is improved; the polyethylene glycol terephthalate has better mechanical property and chemical property, so that the integral bearing strength of the roadbed can be further improved; in addition, the protective plastic is wrapped outside the anchoring piece, so that the anchoring piece can be effectively protected, the anchoring piece is prevented from being corroded, the service life of the net-shaped rib belt structure is prolonged, and the working reliability of the net-shaped rib belt structure is further ensured; specifically, referring to fig. 3, the length of a single hole of a single geocell is L, L is 20cm-25cm, the width of the single hole is B, B is 10cm-15cm, the thickness of a geocell piece is 2mm, and the area of the single hole is 100cm²-150cm²。

In order to further enhance the drainage effect of the roadbed, the method for constructing the light-weight two-ash roadbed based on solid waste utilization provided by this embodiment further includes the following steps: when the gravel cushion layer 12 is paved, waterproof ditches 111 are arranged on two sides of the gravel cushion layer 12, gravel is filled in the waterproof ditches 111, and the filling height of the gravel is the same as the height of the paved roadbed layer; specifically, the width of the water-repellent trench 111 is about 15 cm. The waterproof ditches 111 are arranged on the two sides of the light two-ash soil roadbed structure, so that roadbed water collected in the anti-seepage geotechnical cloth layer 11 can be effectively prevented from flowing downwards, and the drainage effect of the roadbed is further enhanced.

In the light-weight two-ash soil roadbed construction method based on solid waste utilization provided by the embodiment, further, in the foundation treatment step S101, the anti-seepage geotextile layer 11 and the water-seepage geotextile layer 13 are both made of synthetic fibers. Further, in the moisture-preserving and maintaining step S106, the "waterproof geotextile layer 18" is a polyethylene geotextile or a polyvinyl chloride geotextile.

In conclusion, the light two-ash soil roadbed construction method based on solid waste utilization inherits the advantages of light soil pouring of the roadbed, requires a small operation area, does not need large-scale equipment, does not need rolling vibration during construction, has small construction difficulty and overcomes the problem that the roadbed is not compact in rolling and tamping in the filling process; on the other hand, a lower-layer foamed light soil layer, a middle-layer foamed light soil layer and an upper-layer foamed light soil layer with different densities are respectively poured in a layered pouring mode, the density of each foamed light soil layer can be adaptively changed according to the actual engineering during construction, and compared with a roadbed which is completely poured by light soil, the roadbed has higher controllability and applicability; in addition, the upper layer is filled with geocell reinforced light soil, so that the thickness of an overlying soil layer can be effectively reduced to a certain extent while the bearing strength of the roadbed is ensured, and the construction period and the cost are further reduced; meanwhile, the geocell adopts a stress tensioning process, so that the lateral resistance effect is improved to a greater extent, the plastic deformation of the pavement is reduced by 30-50%, the elastic modulus is improved by 40-50%, the phenomena of greater deflection and deformation of the roadbed are avoided, and further, the reduction of the continuous settlement rate caused by the cyclic load is facilitated.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.