Flexible supporting system and method based on expansive soil slope

Abstract

The invention discloses a flexible supporting system and method based on an expansive soil side slope. The flexible supporting system comprises a drainage ditch structure, and the section of the drainage ditch structure is in a U shape; the bottom of the parapet wall structure is aligned with the bottom of the drainage ditch structure, the section of the parapet wall structure is in an L shape, the lower side portion of the parapet wall structure is attached to the lower side portion of the drainage ditch structure, and the parapet wall structure and the drainage ditch structure are of an integrated structure. An upper drainage pipe and a lower drainage pipe are arranged in the parapet wall structure; the drainage structure comprises a drainage pool, one side of the drainage pool is connected with the parapet wall structure, and a gravel filling structure is laid in the drainage pool. On one hand, the sealing layer is arranged at the bottom of the flexible supporting structure, rainwater can be prevented from seeping into the expansive soil side slope, and expansive soil deformation is reduced. On the other hand, when the expansive soil side slope deforms, the flexible supporting structure cannot be damaged by deformation of the expansive soil side slope.

Description

Technical Field

[0001] The invention belongs to the technical field of slope support, and in particular relates to a flexible support system and method based on an expansive soil slope. Background Art

[0002] The volume of expansive soil changes significantly with changes in water content. In a dry state, the connection between expansive soil particles is relatively tight and the overall structure is relatively stable; however, once it encounters rainwater infiltration, the thickness of the double electrical layer on the surface of the soil particles increases, and the repulsive force between the particles increases, causing the soil to expand. This expansion effect is particularly obvious on slopes, because it not only involves the volume change inside the soil, but also the displacement and deformation of the soil under the action of gravity. With the continuous infiltration of rainwater, the deformation process of the expansive soil slope gradually intensifies. On the one hand, the expansion of the soil causes stress concentration inside the slope, especially at the contact interface between the rigid support structure and the soil, where this stress concentration is particularly significant.

[0003] Since the material properties of the rigid support structure determine that its anti-deformation ability is limited, when the stress exceeds its bearing capacity, damage phenomena such as cracks, dislocations, and even fractures will occur. On the other hand, the expansion of the soil may also cause the entire slope to slip or collapse, further exacerbating the degree of damage to the support structure. Therefore, two problems need to be solved at the same time: one is the problem of flexible support for expansive soil slopes, and the other is the problem of the flexible support system itself sliding downward. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a flexible support system based on expansive soil slope, which has the advantages of firm flexible support and solves the problems of the prior art.

[0005] The present invention is implemented in this way: a flexible support system based on expansive soil slope, comprising:

[0006] A gutter structure, wherein the gutter structure has a U-shaped cross section;

[0007] A retaining wall structure, wherein the bottom of the retaining wall structure is aligned with the bottom of the drainage ditch structure, the cross-section of the retaining wall structure is L-shaped, the lower side of the retaining wall structure is in contact with the lower side of the drainage ditch structure, and the retaining wall structure and the drainage ditch structure are an integrated structure; an upper drainage pipe and a lower drainage pipe are provided inside the retaining wall structure;

[0008] A drainage structure, the drainage structure comprising a drainage pool, one side of the drainage pool is connected to the retaining wall structure, and a crushed stone filling structure is laid inside the drainage pool;

[0009] A flexible supporting structure, the flexible supporting structure includes a sealing layer, a crushed stone layer, a reinforced soil layer, and a strengthening layer which are arranged in sequence from bottom to top, the sealing layer and the crushed stone layer are both stepped layered structures, the sealing layer is attached to the expansive soil slope, the crushed stone layer is attached to the sealing layer, and the lower end of the crushed stone layer is connected to the crushed stone filling structure, the reinforced soil layer is arranged on the crushed stone layer, and the lower surface of the reinforced soil layer is stepped, and the upper surface is a plurality of slope surfaces, the slope surfaces are provided with intercepting ditches, and the strengthening layer is arranged on the slope surfaces.

[0010] As a preferred embodiment of the present invention, the upper drain pipe is located above the lower drain pipe, the upper drain pipe is obliquely arranged at the vertical part of the retaining wall structure, the lower drain pipe is obliquely arranged at the horizontal part of the retaining wall structure, and the lower drain pipe passes through the side wall of the drainage ditch structure; the upper drain pipe and the lower drain pipe are each provided with a plurality of groups, and the upper drain pipe and the lower drain pipe are arranged equidistantly in the horizontal direction.

[0011] As a preferred embodiment of the present invention, the slope surface includes a top supporting surface, an inclined supporting surface and an intermediate supporting surface; the upper side of the top supporting surface extends to the upper side of the expansive soil slope, and the lower side of the inclined supporting surface is flush with the upper edge of the retaining wall structure; the top supporting surface is provided with a cutting top intercepting ditch, and the intermediate supporting surface is provided with a platform intercepting ditch.

[0012] As a preferred embodiment of the present invention, the reinforcement layer includes a geogrid, a geocell and a greening layer, the greening layer is arranged on the top supporting surface, and the geogrid and the geocell are arranged on the inclined supporting surface.

[0013] As a preferred embodiment of the present invention, a drainage frame is fixedly connected to the back side of the retaining wall structure, and a water inlet filter plate is provided on the side of the drainage frame away from the retaining wall structure; the upper end of the lower drainage pipe is fixedly connected and connected to the drainage frame, and the upper end of the upper drainage pipe is fixedly connected and connected to the drainage frame.

[0014] As a preferred embodiment of the present invention, a first screw hole is provided on the drainage frame, a second screw hole is provided on the water inlet filter plate, and the positions of the second screw hole and the first screw hole correspond to each other; the upper drainage pipe and the lower drainage pipe are both fixedly connected with a threaded sleeve, the upper end of the threaded sleeve is a closed end, and the threaded sleeve is connected to the first screw hole and the second screw hole;

[0015] The threaded sleeve is provided with a water inlet hole.

[0016] As a preferred embodiment of the present invention, a lifting plate is provided inside the drainage frame, a driving rod is fixedly connected to the upper surface of the lifting plate, an upper cover plate is fixedly connected to the upper end of the driving rod, the upper cover plate is attached to the upper side of the drainage frame, and a roller is rotatably connected to the side of the lifting plate close to the water inlet filter plate, the roller is provided with spikes, and the spikes can penetrate the filter holes of the water inlet filter plate.

[0017] As a preferred embodiment of the present invention, the lower drain pipe is internally rotatably connected to a rotating shaft, a spiral sheet is arranged around the rotating shaft, a blade is fixedly connected to the lower end of the rotating shaft, and the blade is located in the drainage ditch structure; a baffle is arranged on the upper side of the drainage ditch structure, a drainage outlet is opened on the baffle, and the drainage outlet is located above the blade.

[0018] As a preferred embodiment of the present invention, a support plate is fixedly connected to the upper side of the drainage frame, and the lower end of the support plate is fixedly connected to the bottom wall of the drainage pool; a water flow channel is provided inside the support plate, the inlet of the water flow channel is located in the reinforced soil, and the outlet of the water flow channel is located in the gravel filling structure.

[0019] As a preferred embodiment of the present invention, a reinforcing tube is fixedly connected to the lower side of the support plate, the lower end of the reinforcing tube is fixedly connected to the drainage frame, and the reinforcing tube is communicated with the water flow channel and the drainage frame.

[0020] A flexible support method based on expansive soil slope includes the following steps:

[0021] Accurately measure and stake out slopes;

[0022] Carry out fissure grouting treatment on the top of the slope to improve its stability;

[0023] Excavate the slope step by step to form regular excavation steps;

[0024] Transporting the excavated earth away;

[0025] Construct retaining wall structures to enhance the stability of the slope;

[0026] Level the slope surface and roll it to the specified density;

[0027] Compact the slopes to ensure the soil is dense;

[0028] Backfill with crushed stone to facilitate slope drainage;

[0029] Backfill reinforced soil as the main filling material of the slope;

[0030] The geogrid is reversed to enhance the flexible support effect of the slope.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The application of this flexible support system has brought significant beneficial effects. On the one hand, it effectively reduces the stability problem of the expansive soil slope caused by moisture changes through the efficient drainage system and sealing layer design, and prolongs the service life of the slope. On the other hand, the adaptive design of the flexible support structure can flexibly respond to the slight deformation of the slope, reduce the structural damage caused by deformation, and improve the reliability and durability of the overall support system. In addition, the close combination of the retaining wall structure and the drainage ditch structure not only enhances the stability of the support structure, but also facilitates maintenance and management, reducing the subsequent maintenance costs. At the same time, the greening layer design in the strengthening layer also promotes the ecological restoration of the slope, achieving the dual benefits of environmental protection and support. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic cross-sectional structure diagram of a flexible support system based on an expansive soil slope provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the three-dimensional structure of the drainage frame part provided by an embodiment of the present invention from a first viewing angle;

[0035] Figure 3 is a schematic diagram of the three-dimensional structure of the drainage frame part provided by an embodiment of the present invention from a second viewing angle;

[0036] Figure 4 The embodiment of the present invention provides Figure 3 A schematic diagram of the enlarged structure of part A;

[0037] Figure 5 is a schematic side structural diagram of a drainage frame portion provided by an embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of the exploded structure of the drainage frame part provided by an embodiment of the present invention;

[0039] Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the enlarged structure of part B.

[0040] In the figure: 1. drainage ditch structure; 2. retaining wall structure; 3. upper drainage pipe; 4. lower drainage pipe; 5. drainage structure; 6. drainage pool; 7. crushed stone filling structure; 8. flexible support structure; 9. sealing layer; 10. crushed stone layer; 11. reinforced soil layer; 12. strengthening layer; 131. top support surface; 132. inclined support surface; 133. middle support surface; 14. intercepting ditch; 15. drainage frame; 16. water inlet filter plate; 17. threaded sleeve; 18. water inlet hole; 19. lifting plate; 20. driving rod; 21. roller shaft; 22. spike; 23. rotating shaft; 24. spiral sheet; 25. blade; 26. baffle; 27. drainage outlet; 28. support plate; 29. ​​reinforcement pipe. DETAILED DESCRIPTION

[0041] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0042] The structure of the present invention is described in detail below in conjunction with the accompanying drawings.

[0043] like Figures 1 to 7 As shown, an embodiment of the present invention provides a flexible support system based on an expansive soil slope, comprising:

[0044] A gutter structure 1, wherein the cross section of the gutter structure 1 is U-shaped;

[0045] A retaining wall structure 2, wherein the bottom of the retaining wall structure 2 is aligned with the bottom of the gutter structure 1, the cross-section of the retaining wall structure 2 is L-shaped, and the lower side of the retaining wall structure 2 is in contact with the lower side of the gutter structure 1, and the retaining wall structure 2 and the gutter structure 1 are an integrated structure; an upper drain pipe 3 and a lower drain pipe 4 are provided inside the retaining wall structure 2;

[0046] A drainage structure 5, the drainage structure 5 comprises a drainage pool 6, one side of the drainage pool 6 is connected to the retaining wall structure 2, and a gravel filling structure 7 is paved inside the drainage pool 6;

[0047] A flexible supporting structure 8, wherein the flexible supporting structure 8 comprises a sealing layer 9, a crushed stone layer 10, a reinforced soil layer 11, and a strengthening layer 12, which are arranged in sequence from bottom to top. The sealing layer 9 and the crushed stone layer 10 are both stepped layered structures. The sealing layer 9 is attached to the expansive soil slope, the crushed stone layer 10 is attached to the sealing layer 9, and the lower end of the crushed stone layer 10 is connected to the crushed stone filling structure 7. The reinforced soil layer 11 is arranged on the crushed stone layer 10, and the lower surface of the reinforced soil layer 11 is stepped, and the upper surface is a plurality of slope surfaces, a drainage ditch 14 is opened on the slope surface, and the strengthening layer 12 is arranged on the slope surface.

[0048] The working principle of flexible support is:

[0049] On the one hand, the bottom of the flexible support structure 8 is a sealing layer 9, which can prevent rainwater from penetrating into the expansive soil slope and reduce the deformation of the expansive soil. Specifically, rainwater can flow into the intercepting ditch 14 and the drainage ditch structure 1 at the bottom through the slope, and can also penetrate into the gravel layer 10 downward, and flow into the drainage structure 5 along the gravel layer 10 (the gravel layer 10 is composed of gravel, and there are gaps between the gravel), and then flow into the drainage ditch structure 1 at the bottom through the upper drainage pipe 3 and the lower drainage pipe 4 inside the retaining wall structure 2.

[0050] On the other hand, when the expansive soil slope deforms, the sealing layer 9, the reinforced soil layer 11 and the crushed stone layer 10 will deform accordingly, so the flexible support structure 8 will not be damaged by the deformation of the expansive soil slope. The reinforced soil layer 11 is flexible and can absorb the energy of deformation, and the crushed stone layer 10 can help drain water.

[0051] The retaining wall structure 2 can support the flexible supporting structure 8 to prevent the flexible supporting structure 8 from sliding. The retaining wall structure 2 and the drainage ditch structure 1 are integrated structures, such as reinforced concrete structures, so the stability of the retaining wall structure 2 can be increased, thereby improving the stability of the flexible supporting structure 8.

[0052] Furthermore, the upper drain pipe 3 is located above the lower drain pipe 4, the upper drain pipe 3 is obliquely arranged at the vertical part of the retaining wall structure 2, the lower drain pipe 4 is obliquely arranged at the horizontal part of the retaining wall structure 2, and the lower drain pipe 4 passes through the side wall of the drainage ditch structure 1; the upper drain pipe 3 and the lower drain pipe 4 are each provided with a plurality of groups, and the upper drain pipe 3 and the lower drain pipe 4 are arranged equidistantly in the horizontal direction.

[0053] Furthermore, the slope surface includes a top supporting surface 131, an inclined supporting surface 132 and an intermediate supporting surface 133; the upper side of the top supporting surface 131 extends to the upper side of the expansive soil slope, and the lower side of the inclined supporting surface 132 is flush with the upper edge of the retaining wall structure 2; a cutting top intercepting ditch is provided on the top supporting surface 131, and a platform intercepting ditch is provided on the intermediate supporting surface 133.

[0054] Furthermore, the reinforcement layer 12 includes a geogrid, a geocell and a greening layer. The greening layer is arranged on the top supporting surface 131 , and the geogrid and the geocell are arranged on the inclined supporting surface 132 .

[0055] The working principle of this design is mainly based on a multi-level support structure and water interception system. The slope surface is carefully divided into a top support surface 131, an inclined support surface 132 and an intermediate support surface 133, which work together to provide a stable support. The top support surface 131 is closely connected to the expansive soil slope, and the inclined support surface 132 is connected to the lower edge of the retaining wall, ensuring the continuity and stability of the overall structure. At the same time, the setting of the cut-top interception ditch 14 and the platform interception ditch 14 effectively intercepts external water sources such as rainwater, reducing the risk of soil erosion.

[0056] The beneficial effects of this design are as follows: First, the multi-level support structure enhances the stability of the slope and reduces the probability of geological disasters such as landslides. Second, the application of the water interception system effectively prevents the erosion of the slope by external water sources such as rainwater, protecting the soil and vegetation. In addition, the setting of the greening layer not only beautifies the environment, but also fixes the soil through the roots of the vegetation, further enhancing the stability of the slope. At the same time, the use of geogrids and geocells improves the shear strength and bearing capacity of the soil, providing more reliable support for the slope.

[0057] Furthermore, a drainage frame 15 is fixedly connected to the back side of the retaining wall structure 2 (for example, fixedly connected by expansion bolts), and a water inlet filter plate 16 is provided on the side of the drainage frame 15 away from the retaining wall structure 2; the upper end of the lower drainage pipe 4 is fixedly connected and connected to the drainage frame 15, and the upper end of the upper drainage pipe 3 is fixedly connected and connected to the drainage frame 15.

[0058] This setting has the following effects:

[0059] First, the drainage frame 15 is attached to the back side of the retaining wall structure 2 and is fixedly connected to the retaining wall structure 2, so as to reinforce the retaining wall structure 2; in specific implementation, the main body of the drainage frame 15 can be made of stainless steel or aluminum alloy, which has strong structural strength on the one hand and is rust-resistant on the other.

[0060] Second, when draining, water enters the drainage frame 15 after passing through the water inlet filter plate 16, and then enters the lower drainage pipe 4 from the inside of the drainage frame 15. On the one hand, it can prevent the lower drainage pipe 4 from being blocked. On the other hand, after the water enters the drainage frame 15, it can flow quickly into the lower drainage pipe 4 to prevent the water from accumulating on the back of the retaining wall structure 2 and damaging the retaining wall structure 2.

[0061] Third, if there is a lot of water in the drainage frame 15, when the liquid level reaches the upper drainage pipe 3, it can be discharged through the upper drainage pipe 3. In addition, the drainage frame 15 can connect the upper ends of several lower drainage pipes 4, so that even if some of the drainage pipes are blocked, it can be discharged through other drainage pipes, thereby improving fault tolerance.

[0062] Further, the drainage frame 15 is provided with a first screw hole, the water inlet filter plate 16 is provided with a second screw hole, and the position of the second screw hole corresponds to the position of the first screw hole; the upper drainage pipe 3 and the lower drainage pipe 4 are both fixedly connected with a threaded sleeve 17, the upper end of the threaded sleeve 17 is a closed end, and the threaded sleeve 17 is connected to the first screw hole and the second screw hole;

[0063] The threaded sleeve 17 is provided with a water inlet hole 18 .

[0064] This setting has the following effects:

[0065] First, the threaded sleeve 17 is connected to the first screw hole and the second screw hole, so as to fix and support the drainage frame 15 and the water inlet filter plate 16 to prevent them from being squeezed and deformed.

[0066] Second, the device can be easily installed through threaded connection.

[0067] Furthermore, a lifting plate 19 is provided inside the drainage frame 15, and a driving rod 20 is fixedly connected to the upper surface of the lifting plate 19, and an upper cover plate is fixedly connected to the upper end of the driving rod 20, and the upper cover plate is attached to the upper side of the drainage frame 15. The lifting plate 19 is rotatably connected to a roller 21 on one side close to the water inlet filter plate 16, and the roller 21 is provided with spikes 22, and the spikes 22 can penetrate the filter holes of the water inlet filter plate 16.

[0068] With this arrangement, during normal use, the lifting plate 19 is located at the bottom of the drainage frame 15. If there are impurities in the drainage frame 15, they will accumulate on the lifting plate 19. By moving the driving rod 20 upward, the lifting plate 19 can be moved upward, thereby cleaning the impurities (such as fine sand) inside the drainage frame 15 to prevent blockage. In addition, due to the provision of the roller 21, the lifting plate 19 can be easily moved upward; and the spikes 22 can clear the blocked filter holes on the water inlet filter plate 16.

[0069] Furthermore, the lower drain pipe 4 is internally rotatably connected to a rotating shaft 23, a spiral sheet 24 is arranged around the rotating shaft 23, a blade 25 is fixedly connected to the lower end of the rotating shaft 23, and the blade 25 is located in the drain ditch structure 1; a baffle plate 26 is arranged on the upper side of the drain ditch structure 1, a drain outlet 27 is opened on the baffle plate 26, and the drain outlet 27 is located above the blade 25.

[0070] By this arrangement, when the drain ditch structure 1 drains water, the water flow can move the blades 25, so as to facilitate the cleaning of impurities in the lower drain pipe 4; the baffle 26 is used to block the soil to prevent the soil from entering the drain ditch structure 1, and the water flows into the drain ditch structure 1 through the drain port 27, and the blades 25 can be moved to rotate by the potential energy of the water, so as to facilitate the cleaning of impurities in the lower drain pipe 4. If the lower drain pipe 4 is partially blocked, the water level in the drainage frame 15 rises and is discharged through the upper drain pipe 3, and the water in the upper drain pipe 3 can move the blades 25 when falling, so that the spiral piece 24 rotates to facilitate the cleaning of impurities in the lower drain pipe 4. In a specific implementation, the spiral piece 24 can be set to a plastic material, which has the advantage of not being corroded. Preferably, the outer diameter of the spiral piece 24 is smaller than the inner diameter of the lower drain pipe 4. By this arrangement, since the spiral piece 24 does not fit the inner wall of the lower drain pipe 4, the resistance during rotation is small, and the spiral piece 24 has less obstruction to drainage.

[0071] Furthermore, a support plate 28 is fixedly connected to the upper side of the drainage frame 15, and the lower end of the support plate 28 is fixedly connected to the bottom wall of the drainage pool 6; a water flow channel is provided inside the support plate 28, the inlet of the water flow channel is located in the reinforced soil, and the outlet of the water flow channel is located in the gravel filling structure 7.

[0072] This setting has the following effects:

[0073] First, the support plate 28, the drainage frame 15 and the bottom of the drainage pool 6 form a triangular structure, which can reinforce the drainage frame 15 and improve the stability of the retaining wall structure 2;

[0074] Second, the support plate 28 itself has a supporting effect on the flexible support structure 8, which can reduce the risk of landslide;

[0075] Thirdly, the water in the reinforced soil layer 11 can be quickly introduced into the drainage pool 6 to reduce the water content of the reinforced soil layer 11, thereby improving the drainage effect.

[0076] Furthermore, a reinforcing tube 29 is fixedly connected to the lower side of the support plate 28, the lower end of the reinforcing tube 29 is fixedly connected to the drainage frame 15, and the reinforcing tube 29 is connected to the water flow channel and the drainage frame 15. The water in the water flow channel can flow into the drainage pool 6 and the drainage frame 15, thereby improving the drainage effect.

[0077] A flexible support method based on expansive soil slope includes the following steps:

[0078] Accurately measure and stake out slopes;

[0079] Carry out fissure grouting treatment on the top of the slope to improve its stability;

[0080] Excavate the slope step by step to form regular excavation steps;

[0081] Transporting the excavated earth away;

[0082] Construct retaining wall structures to enhance the stability of the slope;

[0083] Level the slope surface and roll it to the specified density;

[0084] Compact the slopes to ensure the soil is dense;

[0085] Backfill with crushed stone to facilitate slope drainage;

[0086] Backfill reinforced soil as the main filling material of the slope;

[0087] The geogrid is reversed to enhance the flexible support effect of the slope.

[0088] Specifically, the precise measurement and setting out of the slope includes the following steps:

[0089] 1. According to the control points provided by the design institute, carry out the following measurements:

[0090] Lay out the center line and side lines of the roadbed.

[0091] Lay out the excavation lines on both sides of the roadbed.

[0092] Remeasure the original ground elevation.

[0093] 2. Draw the following drawings:

[0094] Plan view: mark the roadbed center line, side lines, section pile numbers, etc.

[0095] Cross-section diagram: The spacing between cross-sections is 20 meters, and additional cross-sections will be added when the longitudinal terrain changes are complex.

[0096] 3. Measure the cross-sectional area for engineering quantity verification:

[0097] The cross-sectional area is measured based on the center pile and the corresponding elevation.

[0098] 4. Measurement accuracy requirements:

[0099] The error of the weakest point is within ±50mm.

[0100] The relative position error of the weakest adjacent point is ±30mm.

[0101] The relative mean error of the side length of the weakest adjacent point is less than 1 / 20000.

[0102] 5. Organize measurement data and results.

[0103] Specifically, the slope is excavated step by step to form regular excavation steps:

[0104] 1. Conduct a detailed investigation on the stability of the expansive soil landslide slope, deal with unsafe factors, arrange monitoring points, and monitor the slope stability during construction.

[0105] 2. The steps are designed to be tilted outward by 3% to facilitate drainage, and a supporting seepage ditch is set at the outlet to connect with the platform gravel layer.

[0106] 3. Excavate a temporary slope according to the temporary excavation line, using a slope ratio of 1:1.75, a step width of 2.0 to 4.0 m, and the steps are also inclined outward by 3%.

[0107] 4. Excavation of expansive soil slopes is carried out step by step and protection is provided step by step. Unprotected slopes are covered with waterproof cloth, and the recycling rate of waterproof cloth is 30%.

[0108] 5. During the construction process, re-measure the step edges every 3-5m of excavation and conduct comprehensive sorting.

[0109] Specifically, the construction of the retaining wall structure includes the following steps:

[0110] 1. Calculate the position coordinates and elevation of the retaining wall structure and conduct layout. Place guard piles where they will not affect the construction, use a total station to determine the construction location, and use lime to lay out the excavation line.

[0111] 2. Ensure that the ground drainage facilities are complete, mechanical excavation to the design elevation of 20cm, manual excavation to the design elevation. Check the size, elevation, and bearing capacity of the foundation pit, and carry out foundation and wall construction after meeting the requirements. Take reinforcement measures in case of groundwater seepage.

[0112] 3. Fix the foundation formwork according to the layout line, check the formwork size and line shape, and pour the foundation concrete after acceptance by the supervising engineer.

[0113] 4. Pre-buried PVC drainage pipes with a diameter of 150mm, inclined at 10°, with a longitudinal spacing of 2m and the outlet no less than 300mm from the bottom of the drainage ditch.

[0114] 5. After the concrete of the foundation reaches the designed strength, install the wall formwork to ensure smooth connection of the formwork to avoid leakage. After acceptance by the supervising engineer, pour the concrete.

[0115] 6. After pouring the concrete, maintain it, moisturize the exposed surface, and sprinkle water to avoid dry cracks. When removing the formwork, pay attention to protecting the wall and corners.

[0116] Working principle of the present invention:

[0117] The working principle of the flexible support system is mainly reflected in the all-round protection of the expansive soil slope. First, the sealing layer 9 effectively blocks rainwater from directly penetrating into the expansive soil slope, reducing the expansion and deformation of the soil caused by moisture changes. Rainwater can be quickly drained away through the gravel layer 10 and the intercepting ditch 14, and further guided to the drainage ditch structure 1 through the upper drainage pipe 3 and the lower drainage pipe 4 in the retaining wall structure 2 to ensure that the inside of the slope is dry. At the same time, the reinforced soil layer 11 and the gravel layer 10 in the flexible support structure 8 have good deformation adaptability and can be adjusted with the deformation of the slope to avoid structural damage. The integrated design of the retaining wall structure 2 and the drainage ditch structure 1 not only enhances the stability of the structure, but also provides additional support to prevent the flexible support structure 8 from landslides.

[0118] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0119] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flexible support system based on expansive soil slope, characterized in that: include: A drainage ditch structure (1), wherein the cross section of the drainage ditch structure (1) is U-shaped; A retaining wall structure (2), wherein the bottom of the retaining wall structure (2) is aligned with the bottom of the drainage ditch structure (1), the cross-section of the retaining wall structure (2) is L-shaped, the lower side of the retaining wall structure (2) is in contact with the lower side of the drainage ditch structure (1), and the retaining wall structure (2) and the drainage ditch structure (1) are an integrated structure; an upper drainage pipe (3) and a lower drainage pipe (4) are provided inside the retaining wall structure (2); A drainage structure (5), the drainage structure (5) comprising a drainage pool (6), one side of the drainage pool (6) being connected to the retaining wall structure (2), and a crushed stone filling structure (7) being paved inside the drainage pool (6); A flexible support structure (8), the flexible support structure (8) comprising a sealing layer (9), a crushed stone layer (10), a reinforced soil layer (11), and a strengthening layer (12) arranged in sequence from bottom to top, the sealing layer (9) and the crushed stone layer (10) are both stepped layer structures, the sealing layer (9) is attached to the expansive soil slope, the crushed stone layer (10) is attached to the sealing layer (9), and the lower end of the crushed stone layer (10) is connected to the crushed stone filling structure (7), the reinforced soil layer (11) is arranged on the crushed stone layer (10), and the lower surface of the reinforced soil layer (11) is stepped, and the upper surface is a plurality of slope surfaces, the slope surface is provided with a drainage ditch (14), and the strengthening layer (12) is arranged on the slope surface.

2. A flexible support system based on expansive soil slope according to claim 1, characterized in that: The upper drainage pipe (3) is located above the lower drainage pipe (4), the upper drainage pipe (3) is obliquely arranged on the vertical part of the retaining wall structure (2), the lower drainage pipe (4) is obliquely arranged on the horizontal part of the retaining wall structure (2), and the lower drainage pipe (4) passes through the side wall of the drainage ditch structure (1); the upper drainage pipe (3) and the lower drainage pipe (4) are both provided with a plurality of groups, and the upper drainage pipe (3) and the lower drainage pipe (4) are arranged at equal distances in the horizontal direction.

3. A flexible support system based on expansive soil slope according to claim 1, characterized in that: The slope surface comprises a top supporting surface (131), an inclined supporting surface (132) and an intermediate supporting surface (133); the upper side of the top supporting surface (131) extends to the upper side of the expansive soil slope, and the lower side of the inclined supporting surface (132) is flush with the upper edge of the retaining wall structure (2); a cutting top intercepting ditch is provided on the top supporting surface (131), and a platform intercepting ditch is provided on the intermediate supporting surface (133).

4. A flexible support system based on expansive soil slope as claimed in claim 3, characterized in that: The reinforcement layer (12) comprises a geogrid, a geocell and a greening layer, the greening layer being arranged on the top supporting surface (131), and the geogrid and the geocell being arranged on the inclined supporting surface (132).

5. The flexible support system based on expansive soil slope according to claim 1, characterized in that: A drainage frame (15) is fixedly connected to the back side of the retaining wall structure (2), and a water inlet filter plate (16) is provided on the side of the drainage frame (15) away from the retaining wall structure (2); The upper end of the lower drainage pipe (4) is fixedly connected to and communicated with the drainage frame (15), and the upper end of the upper drainage pipe (3) is fixedly connected to and communicated with the drainage frame (15).

6. A flexible support system based on expansive soil slope according to claim 5, characterized in that: The drainage frame (15) is provided with a first screw hole, and the water inlet filter plate (16) is provided with a second screw hole, and the positions of the second screw hole and the first screw hole correspond; The upper drain pipe (3) and the lower drain pipe (4) are both fixedly connected with a threaded sleeve (17), the upper end of the threaded sleeve (17) is a closed end, and the threaded sleeve (17) is connected to the first screw hole and the second screw hole; The threaded sleeve (17) is provided with a water inlet hole (18).

7. A flexible support system based on expansive soil slope according to claim 6, characterized in that: A lifting plate (19) is provided inside the drainage frame (15), the upper surface of the lifting plate (19) is fixedly connected to a driving rod (20), the upper end of the driving rod (20) is fixedly connected to an upper cover plate, the upper cover plate is attached to the upper side of the drainage frame (15), and the lifting plate (19) is rotatably connected to a roller shaft (21) on a side close to the water inlet filter plate (16), and the roller shaft (21) is provided with spikes (22), and the spikes (22) can penetrate the filter holes of the water inlet filter plate (16).

8. A flexible support system based on expansive soil slope according to claim 7, characterized in that: The lower drain pipe (4) is rotatably connected to a rotating shaft (23), a spiral blade (24) is arranged around the rotating shaft (23), and a blade (25) is fixedly connected to the lower end of the rotating shaft (23), and the blade (25) is located in the drain ditch structure (1); A baffle (26) is provided on the upper side of the drainage ditch structure (1), a drainage port (27) is provided on the baffle (26), and the drainage port (27) is located above the blade (25).

9. A flexible support system based on expansive soil slope according to claim 8, characterized in that: A support plate (28) is fixedly connected to the upper side of the drainage frame (15), and the lower end of the support plate (28) is fixedly connected to the bottom wall of the drainage pool (6); A water flow channel is provided inside the support plate (28), the inlet of the water flow channel is located in the reinforced soil, and the outlet of the water flow channel is located in the gravel filling structure (7).

10. A flexible support method based on expansive soil slope, characterized in that: The following steps are involved: Accurately measure and stake out slopes; Carry out crack grouting treatment on the top of the slope; Excavate the slope step by step to form regular excavation steps; Transporting the excavated earth away; Construction of retaining wall structures; Level the slope surface and roll it to the specified density; Compact the slopes to ensure the soil is dense; Backfill with gravel layer; Backfill reinforced soil; Reverse the geogrid.

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