High-bearing-capacity slope revetment structure in sandy soil environment

Abstract

The utility model discloses a high bearing capacity slope revetment structure in a sandy soil environment, which comprises a slope body, a slope toe section is arranged at the lower end of the slope body, a slope top section is arranged at the higher end of the slope body, retaining side walls are arranged on the outer sides of the slope toe section and the slope top section, and the retaining side walls are connected with the slope toe section and the slope top section. A downwards-sunken arc pit is dug in a side slope body in the direction from a slope toe section to a slope top section, geotechnical cloth layers are arranged on the top face of the slope toe section, the top face of the slope top section and the bottom in the arc pit, geocell layers are arranged on the surfaces of the geotechnical cloth layers, and the geocell layers are fixed to the side slope body through anchor rod assemblies. A non-woven fabric cushion layer, a thick sand soil layer and a planting soil layer are sequentially arranged on the top surface of the geogrid layer from bottom to top. According to the utility model, the construction period can be greatly shortened, the construction and maintenance cost can be reduced, the stability of the slope body can be improved, the overall bearing capacity and stability of the sand slope can be greatly improved, and a better revetment slope protection effect can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive environmental protection management, and particularly relates to a high-bearing-capacity slope revetment structure in a sandy soil environment. Background Technique

[0002] Creating an artificial natural water body in a desert environment is an ideal environmental protection method for current desert environment management. At present, after the excavation of the existing sandy soil slope, the stratum mainly consists of fine sand with a particle size of 1 - 3 mm, the soil layer thickness is 2.8 - 6 m, the sand quality is uniform, belonging to the slightly dense to medium-dense state, the characteristic value of bearing capacity fak is 120 KPa, the deformation modulus E0 is 25, and the cohesion C = 0 KPa. It is easy to have the phenomenon of sandy soil slip on the slope body, and it is necessary to carry out revetment and slope protection treatment on the desert slope to improve the bearing capacity of the slope body. In the existing technology, the common methods to enhance the tensile strength of sandy soil and reduce the risk of slip mainly include vegetation coverage, reducing the slope, and strengthening the bottom of the slope. The above methods are mainly realized by using building materials such as stones, concrete, and brick masonry. These methods have the disadvantages of long implementation period, large investment, high energy consumption, non-renewability, and poor slope protection effect. Therefore, it is objectively necessary to develop a high-bearing-capacity slope revetment structure in a sandy soil environment that is easy to construct, low in cost, can significantly improve the bearing capacity and stability of the overall sandy soil, and achieve a good slope protection effect. Summary of the Invention

[0003] The purpose of the utility model is to provide a high-bearing-capacity slope revetment structure in a sandy soil environment that is easy to construct, low in cost, can significantly improve the bearing capacity and stability of the overall sandy soil, and achieve a good slope protection effect.

[0004] The purpose of the utility model is realized as follows: it includes a slope body, a slope foot section is arranged at the lower end of the slope body, a slope top section is arranged at the higher end of the slope body, retaining walls are arranged on the outer sides of both the slope foot section and the slope top section. An arc-shaped pit that sinks downward is dug on the slope body along the direction from the slope foot section to the slope top section. Geotextile layers are arranged on the top surface of the slope foot section, the top surface of the slope top section, and the bottom of the arc-shaped pit. A geogrid layer is arranged on the surface of the geotextile layer. The geogrid layer is fixed on the slope body through bolt components. Sandy soil is filled in each geogrid chamber of the geogrid layer. A non-woven fabric cushion layer, a thick sandy soil layer, and a planting soil layer are sequentially arranged on the top surface of the geogrid layer from bottom to top.

[0005] Compared with the traditional revetment structure, the advantages of the present utility model are as follows: First, an arc-shaped pit is dug on the slope surface of the slope body of the slope, and then a reasonable revetment structure is arranged in the arc-shaped pit. The dug arc-shaped pit is to facilitate the arrangement of the revetment structure, which is beneficial to improving the connection ability between the revetment structure and the slope body. The set revetment structure is scientific and reasonable. The geotextile layer arranged in the arc-shaped pit can effectively prevent water from penetrating into the slope body, avoiding the sand and soil on the slope body from slipping. At the same time, the geogrid layer in the revetment structure is used to reinforce the slope body. The geogrid cells of the geogrid layer can expand and contract freely, can open and be filled with sand-based soil, reducing the fluidity of the sand and soil. By the compaction method, the cohesion between the sand and soil is increased, and the lateral displacement of the sand-based soil filled therein can be completely restricted or partially restricted, enhancing the strength of the revetment structure, improving the overall bearing capacity and stability of the sand and soil. Moreover, the sand-based soil used in this project is the sand and soil excavated from the slope body of the slope, and the sand and soil can be recycled and filled in the geogrid cells, which can improve the recycling of the sand and soil and reduce the costs of subsequent soil excavation, transportation, etc. In addition, the set non-woven fabric cushion layer can reduce the contact between rainwater and the geogrid layer. The thick sand soil layer and the planting soil layer act together, with good gradation and good water storage capacity. After planting vegetation on the planting layer, a flexible protection system can be formed, which can reduce slope erosion, play a role in fixing the slope and improving the bearing capacity. In summary, the revetment structure set in this device can not only greatly reduce the construction period, lower the construction and maintenance costs, but also divide the large-area sandy soil slope into a geogrid-type unit structure, which can improve the stability of the slope body, reduce the risk of sand sliding on the slope body, enhance the stability of the slope body, greatly improve the overall bearing capacity and stability of the sandy soil slope, achieve a good revetment and slope protection effect, and is applicable to occasions such as wetlands, rivers, lakes, reservoirs, and ecological storage ponds with arid and little rain, inconvenient transportation, and scarce materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is the front view schematic diagram of the present utility model;

[0007] Figure 2 is Figure 1 the view A-A in

[0008] Figure 3 is Figure 2 the enlarged schematic diagram of part B in

[0009] In the figure: 1 - slope body, 2 - toe section, 3 - crest section, 4 - retaining wall, 5 - geotextile layer, 6 - geogrid layer, 7 - anchor bolt assembly, 71 - anchor bolt body, 72 - connecting nut, 73 - upper ring plate, 74 - lower ring plate, 75 - elastic member, 76 - spike, 8 - non-woven fabric cushion layer, 9 - thick sand soil layer, 10 - planting soil layer, 11 - bentonite waterproof felt, 12 - non-woven fabric protective layer, 13 - pressure groove, 14 - sandbag. SPECIFIC EMBODIMENTS

[0010] The present utility model will be further described below in conjunction with the accompanying drawings, but it is not limited in any way. Any changes or improvements made based on the teachings of the present utility model fall within the protection scope of the present utility model.

[0011] As Figures 1 to 3 shown, the present utility model includes a slope body 1. The sand slope body is sandy soil with relatively large fluidity. To maintain the shape of the revetment as a slope structure with an angle of 15 - 45°, a toe section 2 is provided at the lower end of the slope body 1, and a crest section 3 is provided at the higher end of the slope body 1. The arranged toe section 2 and crest section 3 are for facilitating the layout of the revetment structure, improving the bearing capacity and slope protection ability of the revetment structure. A retaining wall 4 is provided on the outer sides of both the toe section 2 and the crest section 3. The retaining wall 4 can enclose the edges of the toe section 2 and the crest section 3, facilitating the installation of the revetment structure and improving the connection stability between the revetment structure and the slope body 1. An arc-shaped pit that sinks downward is dug on the slope body 1 along the direction from the toe section 2 to the crest section 3. Geotextile layers 5 are arranged on the top surface of the toe section 2, the top surface of the crest section 3, and the bottom of the arc-shaped pit. A geogrid layer 6 is provided on the surface of the geotextile layer 5. The geogrid layer 6 is fixed to the slope body 1 through an anchor rod assembly 7. Sand-based soil is filled in each geogrid chamber of the geogrid layer 6. A non-woven fabric cushion layer 8, a thick sand layer 9, and a planting soil layer 10 are sequentially arranged from bottom to top on the top surface of the geogrid layer 6. Corresponding vegetation can be planted on the planting layer 10 according to environmental conditions.

[0012] In the present utility model, the dug arc-shaped pit is for facilitating the layout of the revetment structure, which is beneficial to improving the connection ability between the revetment structure and the slope body 1. The arranged revetment structure is scientific and reasonable. The geotextile layer 5 arranged in the arc-shaped pit can effectively prevent water from penetrating into the slope body 5, avoiding the sliding of the sandy soil of the slope body 5. At the same time, in the revetment structure, the geogrid layer 6 is used to reinforce the slope body 1. The geogrid chambers of the geogrid layer 6 can expand and contract freely, can open and be filled with sand-based soil, reducing the fluidity of the sandy soil. By the compaction method, the cohesion between the sandy soils is increased. The lateral displacement of the filled sand-based soil can be completely restricted or partially restricted, enhancing the strength of the revetment structure, improving the overall bearing capacity and stability of the sandy soil. Moreover, the sand-based soil used in this project is the sandy soil excavated from the slope body 6. The sandy soil is recycled and filled in the geogrid chambers, which can improve the recycling of the sandy soil and reduce the costs of subsequent soil excavation, transportation, etc. In addition, the arranged non-woven fabric cushion layer 8 can reduce the contact between rainwater and the geogrid layer 6. The thick sand layer 9 and the planting soil layer 10 act together, with good gradation and good water storage capacity. After planting vegetation on the planting layer 10, a flexible protection system can be formed, which can reduce slope erosion, play a role in fixing the slope and improving the bearing capacity. The construction method of the revetment structure set in the present utility model is:

[0013] ① On the slope body 1 that needs revetment, the foot section 2 and the top section 3 are arranged, and then an arc pit is excavated on the slope surface of the slope body 1. The arc pit is higher in the foot section and the top section and lower in the middle of the slope body. After the arc pit is excavated to a suitable elevation, the sand foundation in the arc pit is compacted and leveled. At the same time, retaining walls are piled up on the outside of the foot section and the top section;

[0014] ② Lay a geotextile layer 5 on the top surface of the slope foot section 2, the top surface of the slope top section 3 and the bottom of the arc pit. The geotextile used in the geotextile layer 5 is an existing technology, which is directly purchased on the market;

[0015] ③ Lay geocells on the paved geotextile layer along the slope body. The geocells are fixed on the slope body with anchor rod assemblies. The anchor rod assembly position is determined according to the size of the geocell and the detailed size of the geocell. The anchor rod assembly must be perpendicular to the slope body 1, and the diameter and fixing method of the anchor rod assembly must meet the design requirements. The depth of the anchor rod assembly inserted into the slope body 1 is about 30 cm. After the geocell is laid, the sand base soil should be filled in time. The sand base soil filled in the geotextile room is the sand dug out of the arc pit. A certain proportion of gravel can be added to the surface of the sand base soil to improve the slope protection capacity of the sand base soil. After the sand base soil is filled, it needs to be vibrated and compacted, and the surface of the geocell layer 6 is cleared of sharp objects, stones, wood blocks and other debris;

[0016] ④ According to the revetment structure, a non-woven fabric cushion layer 8, a thick sand layer 9 and a planting soil layer 10 are laid on top of the geogrid layer 6. The planting layer 10 can be filled into an inclined structure along the slope of the slope body 1. Afterwards, a water filling test is carried out on the completed revetment structure. The poured water will not penetrate into the slope body 1. This can improve the bearing capacity of the slope body 1 and achieve a better slope protection effect. After the water filling test is completed, vegetation can be planted on the planting layer 10.

[0017] Furthermore, in order to improve the anti-seepage effect of the revetment structure and prevent moisture from penetrating into the slope body 1, bentonite waterproofing felt 11 and non-woven protective layer 12 are arranged from bottom to top between the non-woven fabric cushion layer 8 and the thick sand layer 9 in the arc pit. The bentonite waterproofing felt 11 and the non-woven protective layer 12 are structures used in the prior art. The finished products can be directly purchased according to the needs of use. The model of the bentonite waterproofing felt 11 is 6kg / m 2 The non-woven fabric type of the non-woven fabric protective layer 12 is 150-200g / m 2 .

[0018] Furthermore, the geogrid layer 6 is formed by welding or riveting high-strength HDPE or PP copolymer broadband into a reticulated cell structure. The height of each geocell in the geogrid layer 6 is 100 - 120 mm, and the size of each geocell is 200 mm × 200 mm. When using the geocell structure body to reinforce the slope body 1, during the reinforcement and deformation process of the slope body 1, the geocell first provides a large friction coefficient and cohesion through the friction and adhesion between the slope body 1 and the sand-based soil, while the honeycomb geocell generates a large frictional force and tensile resistance. Secondly, when the geocells are filled with sand-based soil, they interact with each other. The geocells provide a greater lateral restraint force on the sand-based soil, and the side walls of the geocells generate an upward frictional support force on the filler, thereby enhancing the strength of the composite material structure layer, forming rigidity and strength. Just like a raft foundation, it effectively disperses the stress and makes the load distribution more uniform, further improving the stability ability of the geogrid layer 6.

[0019] In order to achieve a better slope protection effect, the thickness of the thick sand layer 9 is 150 - 200 mm, and the thickness of the planting soil layer 10 is 400 - 500 mm.

[0020] Furthermore, on the geogrid layer 6 of the toe section 2 and the crest section 3, there are downward concave pressure grooves 13. The non-woven fabric cushion layer 8 on the toe section 2 and the crest section 3 is arranged along the pressure grooves 13. The pressure grooves 13 are filled with sandbags 14. The gaps between the pressure grooves 13 and the sandbags 14 and between adjacent sandbags 14 are filled with sandy soil. The pressure grooves 13 are set to enhance the connection strength between the geogrid layer 6 and the slope body 1. By using the sandbags 14 to press and fix the top and bottom ends of the geogrid layer 6, the connection strength between the geogrid layer 6 and the slope body 1 can be improved, and further the slope protection ability of the geogrid layer 6 can be improved. Preferably, the height of the pressure groove 13 is 300 mm and the width is 300 mm.

[0021] Furthermore, the anchor rod assembly 7 includes an anchor rod body 71 and a connecting nut 72. Connecting holes are penetrated through the grids of the geogrid layer 6. The lower end of the anchor rod body 71 passes through the connecting holes and is inserted into the slope body 1. A protective sleeve is sleeved on the upper end of the anchor rod body 71. The bottom surface of the protective sleeve abuts against the top surface of the thick sand layer 9. Threads are provided at the upper end of the anchor rod body 71 at the position of the protective sleeve. The connecting nut 72 is threadedly connected to the upper end of the anchor rod body 71 and tightly abuts against the top surface of the protective sleeve. The geogrid is laid on the geotextile layer 5. Then, the anchor rod body 71 is installed at fixed points according to the detailed dimensions of the geogrid. Then, the geogrid is fixed to the slope body 1 by using the anchor rod body 71. After that, the corresponding non-woven fabric cushion layer 8 and thick sand layer 9 are laid as required. Finally, the anchor rod body 71 is fixed to the thick sand layer 9 by using the protective sleeve and the connecting nut 72. The provided protective sleeve can improve the use effect of the anchor rod body 71. If the slope body 1 swells when encountering water, the protective sleeve can shrink accordingly for buffering and release the swelling force, thereby achieving the effect of ensuring the quality of the anchor rod body 71 and the safety of the slope. Its long-term protection effect is good and it will not bring a series of potential safety hazards in the later stage. If the bottom slope body 1 shrinks due to water loss, the protective sleeve can stretch accordingly and apply a certain force to the geogrid layer 6 to keep the geogrid layer 6 and the underlying geotextile layer 5 from separating. Preferably, the protective sleeve includes an upper ring plate 73 and a lower ring plate 74. A plurality of elastic members 75 are evenly arranged between the upper ring plate 73 and the lower ring plate 74 on the outer side of the anchor rod body 71. The elastic members 75 can be springs or rubber rings, which can buffer the swelling force or provide a certain elastic force to the geogrid layer 6 to avoid separation between layers of soil. Preferably, a plurality of spikes 76 are obliquely arranged on the outer wall of the anchor rod body 71 located in the slope body 1. The tips of the spikes 76 are obliquely oriented towards the upper end of the anchor rod body 71. The spikes can improve the connection strength between the anchor rod body 71 and the slope body 7, and thus improve the slope protection effect of the revetment structure.

Claims

1. A high-bearing-capacity slope revetment structure in a sandy soil environment, comprising a slope body (1), characterized in that: At the lower end of the slope body (1), there is a toe section (2), and at the higher end of the slope body (1), there is a crest section (3). Retaining walls (4) are provided on the outer sides of both the toe section (2) and the crest section (3). An arc-shaped pit that sinks downward is dug on the slope body (1) along the direction from the toe section (2) to the crest section (3). Geotextile layers (5) are arranged on the top surface of the toe section (2), the top surface of the crest section (3), and the bottom inside the arc-shaped pit. A geogrid layer (6) is provided on the surface of the geotextile layer (5). The geogrid layer (6) is fixed to the slope body (1) through anchor rod assemblies (7). Each geogrid cell of the geogrid layer (6) is filled with sandy soil. On the top surface of the geogrid layer (6), a non-woven fabric cushion layer (8), a thick sandy soil layer (9), and a planting soil layer (10) are sequentially arranged from bottom to top.

2. The high-bearing-capacity slope revetment structure in a sandy soil environment according to claim 1, characterized in that: Between the non-woven fabric cushion layer (8) and the thick sandy soil layer (9) located inside the arc-shaped pit, a bentonite waterproof felt (11) and a non-woven fabric protective layer (12) are sequentially arranged from bottom to top.

3. A high-bearing-capacity slope revetment structure in a sandy soil environment according to claim 1, characterized in that: The geogrid layer (6) is formed by welding or riveting high-strength HDPE or PP copolymer broadband into a mesh grid structure. The height of each geogrid cell of the geogrid layer (6) is 100 - 120 mm, and the size of each geogrid cell is 200 mm × 200 mm.

4. A high bearing capacity slope revetment structure in a sandy soil environment according to claim 1, characterized in that: The thickness of the thick sandy soil layer (9) is 150 - 200 mm, and the thickness of the planting soil layer (10) is 400 - 500 mm.

5. The high-bearing-capacity slope revetment structure in a sandy soil environment according to claim 1, characterized in that: Depressed grooves (13) that sink downward are provided on the geogrid layer (6) of the toe section (2) and the crest section (3). The non-woven fabric cushion layer (8) on the toe section (2) and the crest section (3) is arranged along the depressed grooves (13). Sand bags (14) are filled in the depressed grooves (13), and the gaps between the depressed grooves (13) and the sand bags (14) and between adjacent sand bags (14) are filled with sandy soil.

6. A high bearing capacity slope revetment structure in a sandy soil environment according to claim 5, characterized in that: The height of the depressed groove (13) is 300 mm, and the width is 300 mm.

7. A high-bearing-capacity slope revetment structure in a sandy soil environment according to claim 1, characterized in that: The anchor rod assembly (7) includes an anchor rod body (71) and a connecting nut (72). Connecting holes are penetrated through the grids of the geogrid layer (6). The lower end of the anchor rod body (71) passes through the connecting hole and is inserted into the slope body (1). A protective sleeve is sleeved on the upper end of the anchor rod body (71). The bottom surface of the protective sleeve abuts against the top surface of the thick sandy soil layer (9). Threads are provided at the upper end of the anchor rod body (71) at the position of the protective sleeve. The connecting nut (72) is threadedly connected to the upper end of the anchor rod body (71) and tightly abuts against the top surface of the protective sleeve.

8. A high bearing capacity slope revetment structure in sandy soil environment according to claim 7, characterized in that: The protective sleeve includes an upper ring plate (73) and a lower ring plate (74). A plurality of elastic members (75) are evenly arranged between the upper ring plate (73) and the lower ring plate (74) on the outer side of the anchor rod body (71).

9. A high bearing capacity slope revetment structure in a sandy soil environment according to claim 7, characterized in that: A plurality of spikes (76) are obliquely arranged on the outer wall of the anchor rod body (71) located inside the slope body (1), and the tips of the spikes (76) are obliquely oriented towards the upper end of the anchor rod body (71).

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