Redundant and safe reinforced soil structure and construction method

Abstract

The invention relates to the technical field of slope supporting construction of constructional engineering, and particularly discloses a redundant and safe reinforced soil structure and a construction method. Reinforced soil is of a multi-step structure and is constructed on a weathered rock foundation; the reinforced soil sequentially comprises a plain concrete foundation, multiple layers of integral steel-plastic geogrids, a graded broken stone drainage layer, a clay water-resisting layer, a waterproof geomembrane, a concrete sealing bottom and plain filling soil from bottom to top, and reinforced concrete panels are poured on the outer sides of the integral steel-plastic geogrids. A reinforced concrete foundation is arranged at the bottom of the reinforced concrete face plate, a cement soil cushion layer is laid at the bottom of the reinforced concrete face plate, drainage holes and pre-embedded steel tie bars are arranged in the reinforced concrete face plate, the pre-embedded steel tie bars and the whole steel-plastic geogrids are bundled up, and a gravel inverted filter bag is arranged in each layer of steel-plastic geogrids. The clay water-resisting layer and the gravel drainage layer are laid to achieve redundant safe water prevention and drainage, the construction period is controllable, and the manufacturing cost is relatively low.

Description

Technical Field

[0001] This invention relates to the field of slope protection construction technology in building engineering, specifically to a redundant and safe reinforced soil structure and its construction method. Background Technology

[0002] With the continuous development of construction technologies for high-speed railways, highways, large civil buildings, and large public buildings both domestically and internationally, more and more construction projects need to cross various terrains, including high slopes, deep foundation pits, and river valleys. Many construction concepts are beginning to lean towards building on mountains, and slope protection technology is becoming more and more mature. How to use more economical, convenient, and safe slope protection methods is a key problem that builders are currently considering. Traditional high-backfill slope support often employs anti-slide piles + inter-pile retaining plates or anchor bolts / cables + lattice structures + soil improvement reinforcement. For example, patent CN113982004B discloses an anchor cable-reinforced soil composite retaining structure and its construction method, including columns and wall modules. The columns have slots, and the wall modules are inserted into the slots of the columns on both sides. Connecting members are provided on the inner side of the wall modules, forming a gap between the connecting members and the wall modules. One end of the reinforcing material is fitted onto the connecting member and secured in the gap. Filler is placed between the upper and lower layers of reinforcing material. When the soil settles, the reinforcing material can move downwards along the connecting member. The columns have pre-drilled anchor holes for the installation of prestressed anchor cables. This approach has drawbacks. Using prestressed anchor cables requires installing anchor bolts inside the slope. Due to the complexity of the slope's interior, a significant amount of time is needed to measure the slope and determine the anchor bolt installation location, resulting in high project costs, long construction periods, and difficulty in controlling project costs and construction progress. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the technical problem solved by this invention is to provide a redundant and safe reinforced soil structure and construction method, thereby solving the problems of high cost and long construction period of existing high backfill slope support.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A redundant and safe reinforced soil structure is disclosed. The reinforced soil is a multi-stage structure constructed on a weathered rock foundation. From bottom to top, the reinforced soil includes a plain concrete foundation, an integral steel-plastic geogrid, a graded crushed stone drainage layer, a clay waterproof layer, a waterproof geomembrane, a concrete bottom seal, and plain fill. The integral steel-plastic geogrid has multiple layers. A reinforced concrete panel is poured on the outside of the steel-plastic geogrid. A reinforced concrete foundation is provided at the bottom of the reinforced concrete panel. A cement-soil cushion layer is laid at the bottom of the reinforced concrete. Drainage holes and pre-embedded tie bars are provided inside the reinforced concrete panel. The pre-embedded tie bars are tied to the integral steel-plastic geogrid. Each layer of steel-plastic geogrid contains a crushed stone filter bag. The extension of the filter bag is fixed with two wire ties and three through-and-through connecting straps, connecting the steel-plastic geogrid of the same layer. One through-and-through connecting strap is provided between the upper and lower steel-plastic geogrids.

[0005] Furthermore, a drainage ditch is provided on the inner side of the plain fill soil, and the drainage ditch abuts against the reinforced concrete panel. A reinforced concrete cap stone is provided on the outer side of the plain fill soil, and the reinforced concrete cap stone extends out of the reinforced concrete panel.

[0006] Furthermore, the drainage holes are arranged in a staggered pattern using 50mm PVC pipes, with holes drilled at the ends of the PVC pipes and geotextile wrapped around them for filtration.

[0007] Furthermore, the graded crushed stone drainage layer is a single layer with a thickness of 400 mm, and the clay waterproof layer is a double layer with a thickness of 800 mm.

[0008] Furthermore, anti-slide piles are poured on the outer side of the reinforced soil bottom step, and a pile baffle is provided between the anti-slide piles and the reinforced soil. The reinforced soil has multiple settlement joints, with a distance of 10m-15m between the settlement joints and a width of 20mm.

[0009] A redundant and safe method for constructing reinforced soil includes the following steps: S1: Foundation treatment in reinforced soil backfill area: Before backfilling with reinforced soil, the bottom foundation is treated, the original topsoil and silty clay are removed, and the weathered rock layer is chiseled to form a stepped shape. S2: Bottom plain concrete foundation pouring: After the stepped weathered rock layer is formed, the bottom of the foundation is hardened with concrete; S3: Crushed stone filter layer paving: A vertical crushed stone filter layer with a width of 300mm is set along the reinforced soil wall or the inner side of the existing anti-slide pile; S4: Steel-plastic geogrid laying: Select steel-plastic geogrids of different tensile strength grades according to the thickness of the fill soil, lay the steel-plastic geogrids flat along the inner side of the reinforced soil, and lay the steel-plastic geogrids perpendicular to the direction of the reinforced soil to the weathered rock layer. S5: Laying of crushed stone drainage layer and clay waterproof layer: Within a depth of 1.2m below the top of each layer of reinforced soil, lay one 400mm thick graded crushed stone drainage layer and two 800mm thick clay waterproof layers in sequence, and compact and roll them flat; the clay waterproof layer is used to prevent surface water from seeping into the reinforced soil, and the crushed stone drainage layer is used to prevent surface water that has seeped into the soil from being discharged from the reinforced soil in a timely manner, so as to achieve redundant and safe waterproofing and drainage; S6: Construction of reinforced concrete panel foundation with reinforced soil: The foundation is a cast-in-place reinforced concrete foundation. Before construction, a cement-soil cushion layer is constructed under the foundation and compacted to meet the bearing capacity requirements of the foundation.

[0010] S7: Repeated steps of laying crushed stone filter layer, laying steel-plastic geogrid, pre-embedded tie bars, backfill soil compaction and rolling, laying crushed stone drainage layer and clay waterproof layer; S8: Reinforcement binding of reinforced soil and reinforced concrete panel, installation of drainage holes, formwork erection and concrete pouring. After the single-stage reinforced soil is backfilled to the top elevation of the wall, the working scaffolding is erected to bind the wall reinforcement, and drainage holes and settlement joints are reserved. The drainage holes are arranged in a quincunx pattern using 50 PVC pipes. The ends of the PVC pipes need to be drilled and filtered with geotextile. The pouring of the reinforced concrete panel is then completed. S9: Concrete sealing of the top of the single-stage reinforced soil, laying of waterproof geomembrane, construction of drainage ditch and backfilling of plain soil. After the reinforced concrete panel of the single-stage reinforced soil is poured, concrete sealing is carried out on the top of the wall. After the bottom sealing concrete is poured, waterproof geomembrane is laid, drainage ditch is built and plain soil is backfilled in time to prevent surface water from seeping into the reinforced soil.

[0011] Furthermore, before pouring the plain concrete foundation at the bottom of S2, the bottom surface of the foundation pit is excavated to form a 1:0.1 reverse slope, which increases the overall safety and stability of the concrete structure.

[0012] Furthermore, the S3 crushed stone filter layer consists of 300mm thick bags of 2-40mm crushed stone filter bags stacked in a staggered pattern, with a slope ratio of 1:0.1, wrapped with geotextile, and extending at both horizontal ends into the wall by at least 200mm.

[0013] Furthermore, the length L of the steel-plastic geogrid in S4 is increased by 4m, and the ultra-reflective filter bag is 2.7m. It is fixed by two layers of iron wire binding and three layers of connecting tape with a spacing of 0.5m, connecting the geogrid in this layer. The upper and lower geogrids are connected by one layer of connecting tape. The direction of the steel-plastic geogrid with greater strength is perpendicular to the reinforced soil wall surface. Overlapping is not allowed. The overlap in the width direction is 150mm.

[0014] Compared with existing technologies, the beneficial effects of this solution are: 1. By laying a clay waterproofing layer within a depth of 1.2m below the top of each layer of reinforced soil to prevent surface water from seeping into the reinforced soil, and a crushed stone drainage layer to prevent surface water that has already seeped into the soil from being discharged into the reinforced soil in a timely manner, redundant and safe waterproofing and drainage are achieved. The top of the reinforced soil is sealed with concrete, a waterproof geomembrane is laid, and drainage ditches are set up to prevent surface water from seeping into the reinforced soil.

[0015] 2. Based on the traditional anti-slide pile support system, an improved high backfill soil support treatment scheme is adopted. The reinforced soil is a multi-stage structure. Each stage of reinforced soil has a plain concrete foundation, an integral steel-plastic geogrid, a graded crushed stone drainage layer, a clay waterproof layer, a waterproof geomembrane, a concrete bottom seal, and plain fill soil, so as to achieve stable support of the reinforced soil. It can effectively solve the problem of 5~30m high backfill soil support, and the construction period is controllable and the cost is relatively low. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the reinforced soil structure of the present invention; Figure 2 This is a schematic diagram of the overall steel-plastic geogrid of the present invention; Figure 3 This is a schematic diagram of the drainage hole of the present invention; Figure 4 This is a schematic diagram of the settlement joint of the present invention; In the diagram: 1-Anti-slide pile, 2-Pile baffle, 3-Plain concrete foundation, 4-Stepped treatment line for weathered rock foundation, 5-Naturally weathered rock layer line, 6-Integral steel-plastic geogrid, 7-Graded crushed stone drainage layer, 8-Clay waterproof layer, 9-Waterproof geomembrane, 10-Concrete bottom seal, 11-Plain fill, 12-Drainage ditch, 13-Reinforced concrete capstone, 14-Cement-soil cushion layer, 15-Reinforced concrete foundation, 16-Reinforced concrete panel, 17-Drainage hole, 18-Embedded tie bar, 19-Crushed stone filter bag, 20-Wire, 21-Through connecting strip, 22-Settlement joint. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Implementation, for example, attached Figures 1 to 4 As shown: A redundant and safe reinforced soil structure, wherein the reinforced soil is a multi-stage structure and is constructed on a weathered rock foundation, such as... Figure 1As shown, before the reinforced soil construction, the weathered rock layer was chiseled to form a stepped shape. The figure marks the natural weathered rock layer line 5 and the stepped treatment line for the weathered rock foundation 4. The reinforced soil, from bottom to top, includes a plain concrete foundation 3, an integral steel-plastic geogrid 6, a graded crushed stone drainage layer 7, a clay waterproofing layer 8, a waterproof geomembrane 9, a concrete bottom seal 10, and plain fill 11. The integral steel-plastic geogrid 6 has multiple layers, and a reinforced concrete panel 16 is poured on the outside of the steel-plastic geogrid. The bottom of the reinforced concrete panel 16... The unit is equipped with a reinforced concrete foundation 15, a cement-soil cushion layer 14 is laid at the bottom of the reinforced concrete, and a drainage hole 17 and a pre-embedded tie bar 18 are provided in the reinforced concrete panel 16. The pre-embedded tie bar 18 is tied to the integral steel-plastic geogrid 6. Each layer of steel-plastic geogrid is equipped with a crushed stone filter bag 19. The extension of the filter bag is tied and fixed with two iron wires 20 and three through-wrap connecting strips 21 to connect the steel-plastic geogrid of this layer. One through-wrap connecting strip 21 is set between the upper and lower steel-plastic geogrids.

[0019] The inner side of the plain fill 11 is provided with a drainage ditch 12, which abuts against the reinforced concrete panel 16. The outer side of the plain fill 11 is provided with a reinforced concrete cap stone 13, which extends out of the reinforced concrete panel 16. The drainage holes 17 are arranged in a staggered pattern using 50 PVC pipes. The ends of the PVC pipes are drilled and filtered with geotextile. The graded crushed stone drainage layer 7 is one layer with a thickness of 400 mm. The clay waterproof layer 8 is two layers with a thickness of 800 mm. Anti-slide piles 1 are poured on the outer side of the reinforced soil bottom step. A pile baffle 2 is provided between the anti-slide piles 1 and the reinforced soil. The reinforced soil has multiple settlement joints 22, which are spaced 10 m to 15 m apart and are 20 mm wide.

[0020] A redundant and safe method for constructing reinforced soil includes the following steps: S1: Foundation treatment in reinforced soil backfill area: Before backfilling with reinforced soil, the bottom foundation is treated, the original topsoil and silty clay are removed, and the weathered rock layer is chiseled to form a stepped shape. S2: Bottom plain concrete foundation pouring: After the stepped weathered rock layer is formed, the bottom of the foundation is hardened with concrete. Before pouring the bottom plain concrete foundation, the bottom of the foundation pit is excavated to form a 1:0.1 reverse slope to increase the overall safety and stability of the concrete structure. S3: Crushed stone filter layer installation: Along the reinforced soil wall or the inner side of the existing anti-slide pile, a vertical 300mm wide crushed stone filter layer is installed. The crushed stone filter layer consists of 300mm thick bags of 2-40mm crushed stone filter bags stacked in a staggered manner, with a slope ratio of 1:0.1. The horizontal ends penetrate into the wall by no less than 200mm (Note: The reinforced soil wall is the surface during the construction of the reinforced soil, and can also be regarded as the reinforced concrete panel on the surface of the reinforced soil. Since the reinforced concrete panel is constructed in a later step, and since the reinforced soil can be called a retaining wall, it is referred to as the reinforced soil wall for convenience. The "wall" in this article refers to this meaning). When stacking the crushed stone filter bags, pre-embedded tie bars are installed, protruding 10cm from the wall surface. The part buried in the soil is wrapped with two layers of asphalt fiberglass cloth for corrosion protection, and the hooks are anchored into the cast-in-place panel. 22 threaded bars are pre-embedded to a depth of 3m, with a spacing of 1.2m×0.8m. The hooks are anchored into the reinforced concrete panel by no less than 100mm, and the hook length is no less than 60mm. S4: Steel-plastic geogrid laying: Select steel-plastic geogrids of different tensile strength grades according to the fill thickness. Lay the steel-plastic geogrid flat along the inner side of the reinforced soil. Perpendicular to the reinforced soil direction, lay the entire steel-plastic geogrid to the weathered rock layer. Increase the length L of the steel-plastic geogrid by 4m and the ultra-reverse filter bag by 2.7m. Use two wire ties to fix it and three connecting strips with a spacing of 0.5m to connect the geogrid in this layer. The upper and lower steel-plastic geogrids are connected by one connecting strip. The direction of the stronger steel-plastic geogrid is perpendicular to the reinforced soil wall. Overlap is not allowed. The overlap in the width direction is 150mm. Before laying the steel-plastic geogrid, spread a fill material thicker than 5cm, and then lay the steel-plastic geogrid on it. Place a layer of geotextile between the steel-plastic geogrid and the crushed stone filter bag to prevent fill material loss. Pre-embed tie bars and tie them to the steel-plastic geogrid. S5: Laying of crushed stone drainage layer and clay waterproof layer: Within a depth of 1.2m below the top of each layer of reinforced soil, lay one 400mm thick graded crushed stone drainage layer and two 800mm thick clay waterproof layers in sequence, and compact and roll them flat; the clay waterproof layer is used to prevent surface water from seeping into the reinforced soil, and the crushed stone drainage layer is used to prevent surface water that has seeped into the soil from being discharged from the reinforced soil in a timely manner, so as to achieve redundant and safe waterproofing and drainage; S6: Construction of reinforced concrete panel foundation with reinforced soil: The foundation is a cast-in-place reinforced concrete foundation. Before construction, a cement-soil cushion layer is constructed under the foundation and compacted to meet the bearing capacity requirements of the foundation.

[0021] S7: Repeat the steps of laying the crushed stone filter layer, laying the steel-plastic geogrid, pre-embedding the reinforcing bars, compacting the backfill soil, laying the crushed stone drainage layer and the clay waterproof layer. The backfill material should be selected based on the test results of the backfill test section. Based on the geomechanical parameters obtained from the test section, such as the maximum dry density, optimum moisture content, compaction degree, internal friction angle, internal cohesion, and unit weight, select the soil-stone ratio, particle size, and layer thickness requirements of the soil material. When unloading, the distance between the equipment and the reinforced soil wall should not be less than 1.5m. The equipment must not drive on the reinforcement material that is not covered with fill material and must not disturb the lower layer of reinforcement. The fill material can be laid manually or mechanically, with a uniform thickness, a smooth surface, and a cross slope of not less than 3%. When laying mechanically, the paving machine should be at least 1.5m away from the panel, and its direction of travel should be perpendicular to the reinforcement. It is forbidden to drive or park on reinforcement without cover. Within 1.5m of the wall, manual laying should be used. After each layer of fill material is laid and leveled, it should be compacted promptly. Depending on the fill material type, a 12t-18t vibratory roller should be used, compacting 6-8 times, starting with light compaction and gradually increasing the intensity. The work should begin from the middle of the reinforcement and gradually compact towards the tail, then compact the area near the panel. For the fill material within 1.5m of the wall, small machinery (a 1.5t roller can be used) should be used to lightly compact from behind the panel to the center of the line to avoid disturbing the surface layer. The roller tracks should overlap by 1 / 3-1 / 4, proceeding along the wall line, and abrupt changes in direction or speed are prohibited. Large machinery should not travel within 1.5m behind the wall. S8: Reinforcement binding of reinforced soil and reinforced concrete panel, installation of drainage holes, formwork erection and concrete pouring. After the single-stage reinforced soil is backfilled to the top elevation of the wall, the working scaffolding is erected to bind the wall reinforcement, and drainage holes and settlement joints are reserved. The drainage holes are arranged in a quincunx pattern using 50 PVC pipes. The ends of the PVC pipes need to be drilled and filtered with geotextile. The pouring of the reinforced concrete panel is then completed. S9: Concrete sealing of the top of the single-stage reinforced soil, laying of waterproof geomembrane, construction of drainage ditch and backfilling of plain soil. After the reinforced concrete panel of the single-stage reinforced soil is poured, concrete sealing is carried out on the top of the wall. After the bottom sealing concrete is poured, waterproof geomembrane is laid, drainage ditch is built and plain soil is backfilled in time to prevent surface water from seeping into the reinforced soil.

[0022] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A redundant and safe reinforced soil structure, wherein the reinforced soil is a multi-stage structure and is constructed on a weathered rock foundation, characterized in that: The reinforced soil structure, from bottom to top, comprises a plain concrete foundation, an integral steel-plastic geogrid, a graded crushed stone drainage layer, a clay waterproofing layer, a waterproof geomembrane, a concrete bottom seal, and plain fill. The integral steel-plastic geogrid has multiple layers. A reinforced concrete panel is poured on the outside of the steel-plastic geogrid, and a reinforced concrete foundation is provided at the bottom of the reinforced concrete panel. A cement-soil cushion layer is laid at the bottom of the reinforced concrete. Drainage holes and pre-embedded tie bars are provided inside the reinforced concrete panel. The pre-embedded tie bars are tied to the integral steel-plastic geogrid. Each layer of steel-plastic geogrid contains a crushed stone filter bag. The extension of the filter bag is fixed with two wire ties and three through-and-through connecting straps, connecting the steel-plastic geogrid of this layer. One through-and-through connecting strap is provided between the upper and lower steel-plastic geogrids.

2. The redundant and safe reinforced soil structure according to claim 1, characterized in that: A drainage ditch is provided on the inner side of the plain fill soil, and the drainage ditch abuts against the reinforced concrete panel. A reinforced concrete cap stone is provided on the outer side of the plain fill soil, and the reinforced concrete cap stone extends out of the reinforced concrete panel.

3. The redundant and safe reinforced soil structure according to claim 1, characterized in that: The drainage holes are arranged in a staggered pattern using 50mm PVC pipes, with holes drilled at the ends of the PVC pipes and geotextile wrapped around them for filtration.

4. The redundant and safe reinforced soil structure according to claim 1, characterized in that: The graded crushed stone drainage layer consists of one layer with a thickness of 400 mm, and the clay waterproof layer consists of two layers with a thickness of 800 mm.

5. The redundant and safe reinforced soil structure according to claim 1, characterized in that: Anti-slide piles are poured on the outer side of the reinforced soil bottom step. A pile baffle is provided between the anti-slide piles and the reinforced soil. The reinforced soil has multiple settlement joints with a distance of 10m-15m between them and a width of 20mm.

6. A redundant and safe method for constructing reinforced soil, characterized in that: Includes the following steps: S1: Foundation treatment in reinforced soil backfill area: Before backfilling with reinforced soil, the bottom foundation is treated, the original topsoil and silty clay are removed, and the weathered rock layer is chiseled to form a stepped shape. S2: Bottom plain concrete foundation pouring: After the stepped weathered rock layer is formed, the bottom of the foundation is hardened with concrete; S3: Crushed stone filter layer paving: A vertical crushed stone filter layer with a width of 300mm is set along the reinforced soil wall or the inner side of the existing anti-slide pile; S4: Steel-plastic geogrid laying: Select steel-plastic geogrids of different tensile strength grades according to the thickness of the fill soil, lay the steel-plastic geogrids flat along the inner side of the reinforced soil, and lay the steel-plastic geogrids perpendicular to the direction of the reinforced soil to the weathered rock layer. S5: Laying of crushed stone drainage layer and clay waterproof layer: Within a depth of 1.2m below the top of each layer of reinforced soil, lay one 400mm thick graded crushed stone drainage layer and two 800mm thick clay waterproof layers in sequence, and compact and roll them flat; the clay waterproof layer is used to prevent surface water from seeping into the reinforced soil, and the crushed stone drainage layer is used to prevent surface water that has seeped into the soil from being discharged from the reinforced soil in a timely manner, so as to achieve redundant and safe waterproofing and drainage; S6: Construction of reinforced concrete panel foundation with reinforced soil: The foundation is a cast-in-place reinforced concrete foundation. Before construction, a cement-soil cushion layer is constructed under the foundation and compacted to meet the bearing capacity requirements of the foundation. S7: Repeated steps of laying crushed stone filter layer, laying steel-plastic geogrid, pre-embedded tie bars, backfill soil compaction and rolling, laying crushed stone drainage layer and clay waterproof layer; S8: Reinforcement binding of reinforced soil and reinforced concrete panel, installation of drainage holes, formwork erection and concrete pouring. After the single-stage reinforced soil is backfilled to the top elevation of the wall, the working scaffolding is erected to bind the wall reinforcement, and drainage holes and settlement joints are reserved. The drainage holes are arranged in a quincunx pattern using 50 PVC pipes. The ends of the PVC pipes need to be drilled and filtered with geotextile. The pouring of the reinforced concrete panel is then completed. S9: Concrete sealing of the top of the single-stage reinforced soil, laying of waterproof geomembrane, construction of drainage ditch and backfilling of plain soil. After the reinforced concrete panel of the single-stage reinforced soil is poured, concrete sealing is carried out on the top of the wall. After the bottom sealing concrete is poured, waterproof geomembrane is laid, drainage ditch is built and plain soil is backfilled in time to prevent surface water from seeping into the reinforced soil.

7. As described in claim 1, characterized in that: Before pouring the plain concrete foundation at the bottom of S2, the bottom of the foundation pit will be excavated to form a 1:0.1 reverse slope.

8. As described in claim 1, characterized in that: The S3 medium-sized crushed stone filter layer consists of 300mm thick bags of 2-40mm crushed stone filter bags stacked in a staggered pattern, with a slope ratio of 1:0.

1. It is wrapped with geotextile, and the horizontal ends extend into the wall by no less than 200mm.

9. As described in claim 1, characterized in that: The length L of the S4 steel-plastic geogrid is increased by 4m, and the ultra-reflective filter bag is 2.7m. It is fixed by two layers of iron wire binding and three layers of connecting tape with a spacing of 0.5m. It connects the geogrid in this layer. The upper and lower geogrids are connected by one layer of connecting tape. The direction of the overall steel-plastic geogrid with greater strength is perpendicular to the reinforced soil wall. Overlapping is not allowed. The overlap in the width direction is 150mm.

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