CN118148162A - Industrial protection structure for expansive soil side slope and construction method thereof - Google Patents

Abstract

The invention discloses an industrial protective structure for an expansive soil side slope and a construction method thereof, relating to the technical field of geotechnical engineering, comprising a retaining protective system and a drainage system; the supporting and blocking protection system comprises a plurality of supporting and blocking walls and a plurality of composite filling bodies, wherein the supporting and blocking walls are arranged along the trend of the slope, the supporting and blocking walls and the slope form a plurality of filling inner cavities, and the composite filling bodies are respectively filled into the filling inner cavities so as to realize graded supporting and blocking of the slope; the drainage system is semi-embedded in the supporting and retaining protection system and comprises a plurality of intercepting ditches and a plurality of slope drainage pipes; the slope drain pipes are embedded along the slope trend and penetrate through the plurality of retaining walls; according to the invention, a slope construction drainage layer is not required to be attached, steps are not required to be excavated, the slope is supported and blocked in a grading manner through each grade, meanwhile, the weight is arranged to reduce the expansion force of the soil body, and the foam light soil in the composite filling body can better play the roles of heat preservation, heat insulation and water prevention, so that the stability of the slope is improved.

Description

Industrial protection structure for expansive soil side slope and construction method thereof

Technical Field

The invention relates to the technical field of geotechnical engineering, in particular to an industrialized protection structure for an expansive soil side slope and a construction method thereof.

Background

The expansive soil is a clay rich in hydrophilic clay minerals such as montmorillonite or illite and has remarkable swelling property. The expansive soil properties are significantly affected by environmental changes, especially by changes in humidity and heat. Due to the water absorption, expansion, water loss and shrinkage characteristics of the expansive soil, shallow slump and slip damage of the expansive soil side slope often occur under the action of dry and wet circulation.

Aiming at the problem of shallow layer damage of an expansion side slope, in engineering practice, rigid supporting and retaining walls such as grout rubble, retaining walls, anchor rod (cable) frame beams, slide-resistant piles and the like are adopted in the past to treat, the rigid supporting does not allow the soil body to deform, and when the expansion deformation of the soil body is large, supporting facilities are often damaged by expansion force. The existing flexible supporting treatment mode can better solve the problem of shallow layer damage of the expansive soil slope.

The following patent search is carried out by treating the existing flexible support:

Patent application CN111576451a discloses a control structure of expansive soil cutting side slope and construction method thereof, which achieves the purpose of water insulation and heat insulation by bagging cultivated soil layers, drainage layers, geotechnical cloth layers, drainage heat insulation layers and the like which are laminated on the excavated slope, but because of the laminated arrangement, the occupied area is required to be additionally increased, the slope is easy to slide and collapse in the construction process of each layer, and farming and weaving soil needs bagging, so that the construction difficulty is high and the efficiency is low.

Patent application CN111809655A discloses an ecological retaining structure of an expansive soil slope and a construction method, and adopts a novel mode of retaining splicing blocks, a three-dimensional net, green plants, anchor rods and flexible connection structures, but the connection of all components is too complex, and the problem of water seepage caused by rubber layer failure exists.

Patent application CN113373949A discloses a protective structure for an expansive soil side slope and a construction method, and has the advantages of simple structure, light weight, high strength, weight reduction, heat preservation and energy buffer and dissipation, but the problems that the stability of an excavated step is difficult to ensure, the assembly water-proof height of a component is insufficient, the woven bag is subjected to layered construction, the industrialization degree is low and the like are solved.

In summary, the existing flexible support treatment method well solves the problem of shallow layer damage of the expansive soil slope, but has the following problems:

1. The industrialization degree is not high: the flexible protection of expansive soil slopes generally requires the use of flexible materials such as retaining splice blocks, tilling straps, geotextiles, and the like. The existing disposal mode at present often needs manual operation for installing and fixing the materials, and is difficult to be completed by completely relying on mechanical equipment.

2. The drainage layer is easy to collapse: the drainage layer is generally made of coarse sand, broken stone and the like, the natural repose angle of the coarse sand is generally between 30 degrees and 35 degrees, the natural repose angle of the broken stone is generally between 30 degrees and 45 degrees, and the drainage leveling layer is attached to the excavation surface in actual engineering, so that the drainage leveling layer is extremely easy to slide and collapse and difficult to construct. If the step excavating mode is adopted, the construction procedure can be increased, and the stability of the steps in the construction process is difficult to ensure.

Disclosure of Invention

The invention aims to provide an industrial protection structure for an expansive soil side slope and a construction method thereof, which solve the problems of low industrialization degree and easy collapse of a drainage layer.

The invention solves the technical problems through the following technical scheme that the invention comprises a supporting and retaining protection system and a drainage system;

The supporting and blocking protection system comprises a plurality of supporting and blocking walls and a plurality of composite filling bodies, wherein the supporting and blocking walls are arranged along the trend of the slope, the supporting and blocking walls and the slope form a plurality of filling inner cavities, and the composite filling bodies are respectively filled into the filling inner cavities so as to realize graded supporting and blocking of the slope;

The drainage system is semi-embedded in the supporting and retaining protection system and comprises a plurality of intercepting ditches and a plurality of slope drainage pipes; the slope drainage pipes are embedded along the slope trend and penetrate through the supporting walls, the intercepting ditches are embedded at the bottommost sides of the composite filling bodies, the intercepting ditches are connected with the supporting walls, and the intercepting ditches are communicated with the slope drainage pipes.

Preferably, the retaining wall comprises a plurality of piles and a plurality of latch plates, wherein a plurality of piles are meshed through a concave-convex structure, a gap is reserved between every two piles at a certain distance, the slope drain pipe penetrates through the gap, and the latch plates are meshed and inserted into the gap.

Preferably, the lower side of the latch plate is provided with a through groove, the shape of the through groove is an arch gate structure, and the slope drain pipe penetrates through the through groove.

Preferably, the composite filling body comprises a cultivated soil layer, a water-proof heat-insulating layer and a gentle slope layer; wherein:

The gentle slope layer sets up in the bottom position of cavity of filling, separate water insulating layer and set up in gentle slope layer upside, gentle slope layer sets up in the upside that separates water insulating layer, separate water insulating layer and gentle slope layer all cover the cavity of filling entirely.

Preferably, the downside position between gentle slope layer and the insulating layer that separates water is provided with ponding and leads the drainage and consider the layer, ponding is led and arrange the pipe in advance in the drainage and consider the layer, just ponding is led the lower extreme of arranging the pipe and is run through the connection pile body, ponding is led the pipe outside and has been seted up a plurality of through-holes.

Preferably, the height of the gentle slope layer close to the supporting wall is 20-60 cm, and the slope rate is 1: 2-1: 5, a step of; the height of the water-proof heat-insulating layer close to the supporting wall is 20cm, and the slope rate is 1:1.5 to 1:3, a step of; the height of the accumulated water drainage layer close to the retaining wall is 15-30 cm, and the slope rate of the accumulated water drainage layer is filled to be 1: 2-1: 10; the slope rate of the cultivated soil layer is 1: 2-1: 5.

Preferably, the lower end of the intercepting ditch is connected with a vertical drain pipe through a pipe joint, and the lower end of the vertical drain pipe is communicated with the slope drain pipe through a three-way joint.

Preferably, sedimentation tanks are arranged on the intercepting ditches at two sides of the vertical drain pipe, and a cover plate fixed on the intercepting ditches is arranged at the upper side of the vertical drain pipe.

Preferably, the outside of the intercepting ditch is provided with a falling clamping groove, and the falling clamping groove is fixedly clamped with the pile body; a plurality of lower hanging wing plates are fixed on the lower side of the intercepting ditch.

The invention also provides a construction method for the expansive soil slope industrialized protection structure, which comprises the following steps:

Step one: processing each component in a prefabrication factory and transporting to a construction site;

step two: finishing the slope to the design slope rate, leveling the slope, and constructing the slope in divided areas;

step three: installing pile bodies of each level of retaining wall along the direction of the slope trend, and reserving a gap for paving a slope drain pipe between the two corresponding pile bodies according to the setting;

step four: then paving slope drain pipes on the slope, enabling the paving paths of the slope drain pipes to pass through gaps of the retaining walls of each level, installing latch plates in the gaps, and installing vertical drain pipes on the slope drain pipes;

step five: sequentially filling a gentle slope layer and a water-proof heat-insulating layer in the filling cavity;

Step six: installing a water intercepting ditch, and connecting the water intercepting ditch with a vertical drain pipe;

step seven: opening holes in the pile body, installing a ponding drainage pipe at the through holes, wrapping the surface of the ponding drainage pipe by adopting reverse filtration geotextile, and then filling a ponding drainage layer covering the ponding drainage pipe on the water-proof heat-insulating layer;

step eight: paving a cultivated soil layer on the top of the accumulated water drainage layer, and planting green plants on the cultivated soil layer.

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

1. The slope surface construction drainage layer is not required to be attached, steps are not required to be excavated, the slope surface of each level is supported and blocked in a grading manner, meanwhile, the weight is arranged to reduce the expansion force of the soil body, the foam light soil in the composite filling body can better play the roles of heat preservation, heat insulation and water prevention, and the stability of the slope is improved;

2. The semi-hidden drainage system is formed by the slope intercepting ditches, the slope, the vertical drainage pipes and the like, so that the slope water can be efficiently discharged, and meanwhile, the slope landscape greening effect is not influenced;

3. The whole industrialized construction degree is high, the heat preservation and humidity control capability of the expansive soil side slope is strong, the anti-scouring capability is strong, the mechanization degree is high, and the construction is convenient.

4. The water-proof heat-insulating layer of the foam light soil separates the expansive soil side slope from the atmospheric environment by utilizing the water-proof heat-insulating property of the foam light soil, so that the change of moisture is prevented, the influence of excavation unloading is reduced, and the development of cracks is prevented;

5. Because the expansive soil is easy to absorb water and expand and lose water and shrink, the traditional single back pressure filling soil is adopted, so that the aims of weight pressing and water and heat insulation are difficult to realize at the same time; based on the requirement of the expansive soil slope for protecting water and heat insulation, and considering the difficulty in fitting and excavating a slope construction weight layer, the invention discloses a non-uniform-thickness composite filling body, and realizes the triple functions of water and heat insulation, weight and industrialized construction.

Drawings

FIG. 1 is a cross-sectional plan view of a retaining wall and drainage system of the present invention;

FIG. 2 is a cross-sectional view of the shield system of the present invention;

FIG. 3 is a cross-sectional view of the drainage system of the present invention;

FIG. 4 is an axial view of a retaining wall and drainage system of the present invention;

FIG. 5 is an axial view of the present invention in a water cut-off channel;

fig. 6 is a schematic structural view of two piles according to the present invention.

The figures represent the numbers:

1-A type pile body; 2-B type pile body; 3-latch plates; 4-intercepting ditches; 401-lower hanging wing plate; 402-cover plate; 403-a sedimentation tank; 404-dropping a clamping groove; 405-pipe joint; 5-slope drain pipe; 6-a vertical drain pipe; 7-ponding drainage pipes; 8-a gentle slope layer; 9-ponding draining and filtering layer; 10-a water-proof heat insulation layer; 11-ploughing and planting soil layers.

Detailed Description

The above and further technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

Example 1

The embodiment provides a technical scheme: an industrial protective structure for an expansive soil side slope, as shown in figure 1, comprises a supporting and retaining protective system and a drainage system;

The retaining and protecting system comprises a cultivated soil layer 11, a ponding drainage filtering layer 9, a water-proof heat insulation layer 10, a gentle slope layer 8, a plurality of pile bodies and a plurality of latch plates 3; the pile bodies and the latch plates 3 are spliced to form a plurality of supporting walls which are arranged from top to bottom along the slope; the tillage soil layer 11, the ponding drainage filtering layer 9, the water-proof heat insulation layer 10 and the gentle slope layer 8 are sequentially arranged from top to bottom to form a composite filling body, a transverse filling inner cavity is formed between the supporting wall and the slope, the composite filling body is filled in the filling inner cavity to realize graded supporting through each level of slope, and meanwhile, the weight is arranged to reduce the soil expansion force; the pile body is solid, the appearance is a rectangular strip plate-shaped structure, and the thickness is 0.8-2 cm; in other embodiments, the U-shaped steel sheet pile structure type or other forms can be adopted;

The pile body is divided into an A-type pile body 1 and a B-type pile body 2, the two sides of the A-type pile body 1 are respectively provided with a concave part and a convex part, the two ends of the B-type pile body 2 are respectively provided with a concave part, the concave part and the convex part are in clearance plug fit, the width of the concave part and the convex part is 0.3 cm-0.7 cm, and the depth of the concave part and the convex part is 0.3 cm-0.7 cm; pile bodies are mutually meshed through concave-convex structures along the supporting and blocking direction of the side slope trend, the exposed slope height of the A-type pile body 1 and the B-type pile body 2 is about 0.5-1.5 m, and the embedded depth of the A-type pile body 1 and the B-type pile body 2 is generally not less than 0.7 times of the exposed height.

The pile bodies and the bolt plates 3 are made of high polymer materials, the bolt plates 3 are arranged between the two corresponding pile bodies, through grooves are formed in the bottoms of the bolt plates 3, and the through grooves are in an arch door-shaped structure;

During installation, the concave parts and the convex parts of the A-shaped pile bodies 1 are matched and spliced, a certain gap is reserved at the corresponding position of the supporting wall according to the path paved by the slope drain pipe 5, then the B-shaped pile body 2 is installed, the A-shaped pile bodies 1 are continuously installed on one side of the B-shaped pile body 2, the concave parts are formed on the sides, close to each other, of the A-shaped pile bodies 1 and the B-shaped pile bodies 2, the latch plates 3 are inserted into the concave parts of the A-shaped pile bodies 1 and the B-shaped pile bodies 2, and the installation of the latch plates 3 can be completed, so that the combination of the latch plates 3, the A-shaped pile bodies 1 and the B-shaped pile bodies 2 forms the blocking supporting wall.

The gentle slope layer 8 is arranged at the bottom of the filling inner cavity, the vertical section of the gentle slope layer 8 is of a triangular structure, the gentle slope layer 8 is made of common filling soil, and the gentle slope layer 8 is generally pressed by a digging machine and mainly plays a role in supporting and slowing down the filling gradient of the water-proof heat-insulating layer 10, so that the construction is facilitated.

The water-proof and heat-insulating layer 10 is foamed light soil, the filling thickness is at least 20cm, the filling cavity is covered on the whole surface, the water-proof and heat-insulating properties of the foamed light soil are mainly utilized to separate the expanded soil side slope from the atmospheric environment, the moisture change is prevented, the influence of excavation unloading is reduced, and the crack development is prevented.

The ponding drainage layer 9 is mainly made of crushed stone materials, and the maximum grain diameter is smaller than 5cm.

The cultivated soil layer 11 is directly filled with cultivated soil layer, and the upper surface of the cultivated soil layer is obliquely arranged so as to facilitate the downward flow of water.

The drainage system comprises a water intercepting ditch 4, a vertical drain pipe 6, a slope drain pipe 5 and a ponding drainage pipe 7; the upper part of the intercepting ditch 4 is rectangular, the width of the intercepting ditch is 20-60 cm, the height of the intercepting ditch is 15-40 cm, the lower part of the intercepting ditch is semicircular, the diameter of the intercepting ditch is 20-60 cm, the intercepting ditch 4 is pre-buried at the lowest side position of each level of filled cultivated soil layer 11, and rainfall on the upper surface of the cultivated soil layer 11 can flow into the intercepting ditch 4;

The slope water drain pipe 5 is embedded along the slope, the top end is closed, the bottom end is opened, the grooving width is slightly larger than that of the slope water drain pipe 5, and the slope water drain pipe 5 penetrates through the grooving of a plurality of retaining walls to fix the slope water drain pipe 5.

The intercepting drain 4 is provided with a lower hanging wing plate 401, a pipe joint 405, a sedimentation tank 403, a cover plate 402 and a falling clamping groove 404; the lower hanging wing plate 401 is fixed on the lower side of the intercepting ditch 4, and the lower hanging wing plate 401 is used for enabling the water drainage ditch to be better embedded into a filling body; the cover plate 402 is fixed on the upper side of the intercepting ditch 4, and the position of the cover plate 402 corresponds to that of the vertical drain pipe 6, and the cover plate 402 is used for preventing soil on the surface of the slope surface from directly flowing into a drainage system when the slope surface is wrapped by the rainwater runoff, so that the blockage is easily caused for a long time; the vertical drain pipe 6 is connected with the pipe joint 405, the lower end of the vertical drain pipe 6 is connected with the slope drain pipe 5, so that water flowing into the intercepting ditch 4 can be drained to the slope drain pipe 5 through the vertical drain pipe 6, the slope drain pipe 5 can drain water to the lower side of a slope, a drain ditch is excavated at the lower side of the slope, water can be drained into a river through the drain ditch, the slope drain pipe 5 and the vertical drain pipe 6 are made of common pvc or high polymer materials, and the diameters of the slope drain pipe 5 and the vertical drain pipe 6 are 315-630 mm;

the sedimentation tanks 403 are arranged at intervals of 10-20 cm in the intercepting ditches 4, and the sedimentation tanks 403 mainly have the function of reducing suspended particles and coarse particles in rainwater through gravity sedimentation and reducing the particles flowing into a drainage system; the falling clamping groove 404 is located at one side of the intercepting ditch 4, and the width of the falling clamping groove 404 is adapted to the thickness of the pile body, so that the intercepting ditch 4 can be hung to the upper end of the pile body, and the installation stability of the intercepting ditch 4 is improved.

The diameter of the ponding guide and discharge pipe 7 is 50-110 mm, the pipe length is 10-30 cm, the ponding guide and discharge pipe 7 is made of pile body or pvc material, the ponding guide and discharge pipe 7 is pre-buried in the ponding guide and discharge pipe 9, the outer end of the ponding guide and discharge pipe is communicated with the pile body, through holes are formed in the outer surface of the pipe, the through holes are 2-5 cm, water which is convenient to collect water flow enters the ponding guide and discharge pipe 7, water which permeates into the cultivated soil layer 11 flows downwards and passes through the ponding guide and discharge pipe 9, the ponding guide and discharge pipe 9 blocks soil flow of the cultivated soil layer 11, and then the water flows into the ponding guide and discharge pipe 7 through the through holes and finally is discharged to the next cultivated soil layer 11.

The engineering main body pile body, the foam light soil, the drainage system and the like are higher in industrialization degree, more convenient and fast in construction, and better in waterproof and humidity control effects.

The traditional flexible support is provided with a drainage layer at the position of the geosynthetic material and the soil covered by the geosynthetic material and the position of the excavated slope, the drainage layer is mostly attached to the excavated slope for construction, the drainage layer is extremely easy to be unstable in the construction process, and the drainage layer becomes a channel for rainwater accumulation and infiltration, so that the strength of the slope is further weakened. According to the scheme provided by the embodiment, the pile body supporting mode is arranged on the excavated side slope in a grading mode to combine piles, the mode of multi-stage filling is carried out, the protection height of each stage of side slope is reduced, and then each stage of filling Fang Polv is slowed down.

The traditional flexible support has the advantages that the heat insulation layer is mainly made of broken stone materials, compared with broken stone materials, the foam lightweight soil material for the heat insulation layer has the advantages of simple construction and good integrity, has more excellent heat insulation property on the expansive soil side slope, and has water insulation property.

The grading weights inhibit the expansion force, and the pile bodies of the grading supports and the post-pile grading filling weights are arranged to inhibit the expansion force generated by the deformation of the expansion soil body, so that the slope stability is enhanced.

Semi-hidden drainage system forms semi-hidden three-dimensional drainage system through intercepting ditch 4, domatic drain pipe 5, vertical drain pipe 6, ponding drain pipe 7 etc. and semi-hidden three-dimensional drainage system component all arranges in to prop up the barricade rear side or imbed compound and fill the body rear portion, compares in traditional expansive soil flexible support, can effectively get rid of domatic water and infiltration down, does not influence side slope view greening effect simultaneously.

Because of the characteristics of easy water absorption and expansion and water loss and shrinkage of the expansive soil, the traditional single back pressure filling soil is adopted, and the aims of weight pressing and water insulation and heat insulation are difficult to realize at the same time. Based on the requirement of the expansive soil slope for protecting water and heat insulation, and considering the difficulty in fitting and excavating a slope construction weight layer, the invention discloses a non-uniform-thickness composite filling body, and realizes the triple functions of water and heat insulation, weight and industrialized construction.

Example two

The construction method for the expansive soil slope industrialized protection structure based on the first embodiment comprises the following steps:

(1) The pile body, the bolt plate 3, the intercepting ditch 4, the vertical drain pipe 6, the slope drain pipe 5 and the accumulated water guide and drainage pipe 7 are processed and finished in a prefabricating factory and are transported to a construction site;

(2) Digging the slope surface of the slope to the corresponding design slope rate, leveling the slope surface, constructing the slope surface in divided areas, and planning the laying positions of the pile body and the slope surface drain pipe 5;

(3) Combining the slope excavation rate and the height of the slope, the slope excavation rate is generally slower than 1:1.5, the oblique center distance on the slope of the adjacent two-stage pile bodies of the grading retaining wall is about 3-6 m, and the number of the specific retaining walls is set to be comprehensively considered by combining the slope rate and the excavation height;

(4) Driving piles required by each level of retaining wall along the direction of the slope trend into the slope, reserving positions for installing latch plates 3 at intervals of 10-20 cm, wherein one side of each latch plate 3 is provided with a B-type pile body 2, and the other piles are provided with A-type pile bodies 1;

(5) The slope surface of the slope is paved with the slope surface drain pipe 5 from top to bottom, the paving path passes through the gap between the A-type pile body 1 and the B-type pile body 2, then the latch plate 3 is inserted into the gap, and meanwhile, the position of the slope surface drain pipe 5 is finely adjusted, so that the position of the slope surface drain pipe 5 is conveniently fixed;

(6) A vertical drain pipe 6 is arranged, and the vertical drain pipe 6 is connected with the slope drain pipe 5 through a three-way joint;

(7) Filling a gentle slope layer 8 at the triangular position of the supporting wall and the excavated slope surface, wherein the gentle slope layer 8 is approximately 20-60 cm higher than the supporting wall, and the method comprises the following steps of 1: 2-1: filling the slope with a 5-slope rate, and beating and pressing by a digging machine;

(8) Foam light soil is directly poured on the gentle slope layer 8 to form a water-proof heat-insulating layer 10, the minimum thickness of the water-proof heat-insulating layer 10 is controlled according to 20cm, and the slope rate of the top surface of the water-proof heat-insulating layer 10 is 1:1.5 to 1:3, controlling;

(9) The water intercepting ditches 4 are installed, namely, the slope water draining pipes 5 are connected with the vertical water draining pipes 6 through tee joints, and the sections of each water intercepting ditch 4 are mutually inlaid and connected or connected through glue so as to ensure tightness; the falling clamping groove 404 of the intercepting ditch 4 is clamped at the upper end of the pile body;

(10) The pile body 1 of type A or the pile body 2 of type B is provided with a hole, the distance between the horizontal hole and the hole is 5-10 m, the water accumulation guide and discharge pipe 7 is arranged at the bottom of the water accumulation and discharge layer 9, the surface of the water accumulation and discharge pipe 7 is wrapped by reverse filtration geotextile, and the contact surface of the water accumulation and discharge pipe 7 and the periphery of the pile body is bonded by high-strength glue;

(11) Filling a small amount of accumulated water drainage layer 9 at the triangular position of the water-proof heat-insulating layer 10 behind the pile body, wherein the height of the accumulated water drainage layer 9 near the pile body is about 15-30 cm, and the slope rate of the top surface of the accumulated water drainage layer 9 is generally 1: 2-1: 10, control;

(12) The top of the accumulated water drainage layer 9 is paved with a cultivated soil layer 11, and the slope rate is generally 1: 2-1: 5, controlling;

(13) And planting green plants with developed root systems and suitable for local climate conditions on the cultivated soil layer 11.

The foregoing description of the preferred embodiment of the invention is merely illustrative of the invention and is not intended to be limiting. It will be appreciated by persons skilled in the art that many variations, modifications, and even equivalents may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. Be used for inflation soil side slope industrialization protective structure, its characterized in that: comprises a supporting and blocking protection system and a drainage system;

The supporting and blocking protection system comprises a plurality of supporting and blocking walls and a plurality of composite filling bodies, wherein the supporting and blocking walls are arranged along the trend of the slope, the supporting and blocking walls and the slope form a plurality of filling inner cavities, and the composite filling bodies are respectively filled into the filling inner cavities so as to realize graded supporting and blocking of the slope;

The drainage system is semi-embedded in the supporting and retaining protection system and comprises a plurality of intercepting ditches and a plurality of slope drainage pipes; the slope drainage pipes are embedded along the slope trend and penetrate through the supporting walls, the intercepting ditches are embedded at the bottommost sides of the composite filling bodies, the intercepting ditches are connected with the supporting walls, and the intercepting ditches are communicated with the slope drainage pipes.

2. The industrial protection structure for an expansive soil slope according to claim 1, wherein the retaining wall comprises a plurality of piles and a plurality of latch plates, the piles are meshed through a concave-convex structure, a gap is formed between every two piles at a certain distance, the slope drain pipe penetrates through the gap, and the latch plates are meshed and inserted in the gap.

3. The industrial protection structure for an expansive soil slope according to claim 2, wherein the lower side of the latch plate is provided with a through groove, the through groove is in an arched portal structure, and the slope drain pipe passes through the through groove.

4. The industrialized protection structure for an expansive soil slope according to claim 1, wherein the composite filling body comprises a cultivated soil layer, a water-proof heat-insulating layer and a gentle slope layer; wherein:

The gentle slope layer sets up in the bottom position of cavity of filling, separate water insulating layer and set up in gentle slope layer upside, gentle slope layer sets up in the upside that separates water insulating layer, separate water insulating layer and gentle slope layer all cover the cavity of filling entirely.

5. The industrialized protection structure for an expansive soil slope according to claim 4, wherein a water accumulation and drainage filtering layer is arranged at the lower side between the gentle slope layer and the water insulation layer, a water accumulation and drainage pipe is pre-buried in the water accumulation and drainage filtering layer, the lower end of the water accumulation and drainage pipe penetrates through the connecting pile body, and a plurality of through holes are formed in the outer side of the water accumulation and drainage pipe.

6. The industrial protection structure for an expansive soil slope according to claim 5, wherein the height of the gentle slope layer close to the supporting wall is 20-60 cm, and the slope rate is 1: 2-1: 5, a step of; the height of the water-proof heat-insulating layer close to the supporting wall is 20cm, and the slope rate is 1:1.5 to 1:3, a step of; the height of the accumulated water drainage layer close to the retaining wall is 15-30 cm, and the slope rate of the accumulated water drainage layer is filled to be 1: 2-1: 10; the slope rate of the cultivated soil layer is 1: 2-1: 5.

7. The industrialized protection structure for an expansive soil slope according to claim 1, wherein the lower end of the intercepting ditch is connected with a vertical drain pipe through a pipe joint, and the lower end of the vertical drain pipe is communicated with a slope drain pipe through a three-way joint.

8. The industrialized protection structure for an expansive soil slope according to claim 7, wherein sedimentation tanks are arranged on the intercepting ditches at two sides of the vertical drain pipe, and a cover plate fixed on the intercepting ditches is arranged at the upper side of the vertical drain pipe.

9. The industrial protection structure for the expansive soil slope according to claim 1, wherein the outer side of the intercepting ditch is provided with a falling clamping groove, and the falling clamping groove is clamped and fixed with the pile body; a plurality of lower hanging wing plates are fixed on the lower side of the intercepting ditch.

10. A construction method for an expansive soil slope industrial protective structure according to any of claims 1-9, characterized by comprising the steps of:

Step one: processing each component in a prefabrication factory and transporting to a construction site;

step two: finishing the slope to the design slope rate, leveling the slope, and constructing the slope in divided areas;

step three: installing pile bodies of each level of retaining wall along the direction of the slope trend, and reserving a gap for paving a slope drain pipe between the two corresponding pile bodies according to the setting;

step four: then paving slope drain pipes on the slope, enabling the paving paths of the slope drain pipes to pass through gaps of the retaining walls of each level, installing latch plates in the gaps, and installing vertical drain pipes on the slope drain pipes;

step five: sequentially filling a gentle slope layer and a water-proof heat-insulating layer in the filling cavity;

Step six: installing a water intercepting ditch, and connecting the water intercepting ditch with a vertical drain pipe;

step seven: opening holes in the pile body, installing a ponding drainage pipe at the through holes, wrapping the surface of the ponding drainage pipe by adopting reverse filtration geotextile, and then filling a ponding drainage layer covering the ponding drainage pipe on the water-proof heat-insulating layer;

step eight: paving a cultivated soil layer on the top of the accumulated water drainage layer, and planting green plants on the cultivated soil layer.