Flexible expansive soil slope supporting system

Abstract

The invention discloses a flexible expansive soil side slope supporting system, which belongs to the technical field of geotechnical engineering expansive soil side slope construction, and comprises a flexible supporting unit arranged on the upper side of an expansive soil side slope, the flexible supporting unit comprises a water-resisting layer, a water flow layer, a reinforced soil layer and an additional layer which are sequentially attached to the expansive soil slope from near to far, the water-resisting layer and the water flow layer are each of a step-shaped structure, the lower surface of the reinforced soil layer is of a step-shaped structure, the upper surface of the reinforced soil layer is of a slope surface structure, and a drainage unit is arranged at the lower end of the flexible supporting unit; drainage pipes are inserted into the flexible supporting units, the upper ends of the drainage pipes extend to the upper side of the slope surface and are provided with filter screens, the lower ends of the drainage pipes are inserted into the expansive soil slope, and drainage channels are formed in the drainage pipes. Rainwater infiltration is effectively blocked, water in the slope surface and the soil layer can be drained in time, meanwhile, the strength of the slope soil body is enhanced, and the stability of the slope is comprehensively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction of expansive soil slopes in geotechnical engineering, and particularly relates to a flexible support system for expansive soil slopes. Background Art

[0002] Expansive soil has the characteristic of significantly changing its volume with the change of water content. In a dry environment, the particles of expansive soil are relatively tightly bonded, and the overall structure is in a relatively stable state; however, when infiltrated by rainwater, the thickness of the double electric layer on the surface of soil particles will increase, and the repulsive force between particles will increase accordingly, thereby causing the soil body to expand. This expansion effect is particularly prominent in the surface environment of slopes, because it not only includes the volume change inside the soil body, but also involves the displacement and deformation of the soil body under the action of gravity.

[0003] As rainwater continuously penetrates, the deformation process of the expansive soil slope will gradually intensify. On the one hand, the expansion of the soil body will cause stress concentration inside the slope, especially at the contact interface between the rigid support structure and the soil body, and this stress concentration is more significant. Due to the limited anti-deformation ability of the rigid support structure material, when the stress it bears exceeds its bearing capacity, damage such as cracks, dislocation, and even fracture will occur. On the other hand, the expansion of the soil body may cause the overall sliding or collapse of the slope, which further aggravates the damage degree of the support structure. Based on this, two key problems need to be solved simultaneously: one is the flexible support design problem of the expansive soil slope, and the other is the anti-sliding stability problem of the flexible support system itself. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a flexible support system for expansive soil slopes, which has the advantages of flexible support and anti-sliding, and solves the problems of the prior art.

[0005] The present invention is implemented as follows. A flexible support system for expansive soil slopes includes a flexible support unit arranged on the upper side of the expansive soil slope. The flexible support unit is inclined. The flexible support unit includes a water-proof layer, a water-flow layer, a reinforced soil layer, and an additional layer arranged in a close-fitting manner from near to far from the expansive soil slope. Both the water-proof layer and the water-flow layer are in a stepped structure. The lower surface of the reinforced soil layer is in a stepped structure, and the upper surface of the reinforced soil layer is in a slope structure. A drainage unit is arranged at the lower end of the flexible support unit; A drain pipe is inserted into the flexible support unit. The upper end of the drain pipe extends to the upper side of the slope and has a filter screen. The lower end of the drain pipe is inserted into the expansive soil slope. A drainage channel is arranged inside the drain pipe. Water inlet holes and drainage holes are arranged on the drain pipe. The water inlet holes are located inside the flexible support unit, and the drainage holes are located inside the expansive soil slope; A rotating shaft is provided in the drainage channel. Spiral blades are arranged around the rotating shaft. The spiral blades are attached to the inner wall of the drainage pipe, and the upper ends of the spiral blades and the rotating shaft extend to the outside of the drainage channel.

[0006] Preferably, as the present invention, the drainage unit includes a U-shaped drainage ditch. A retaining wall is provided on the right side of the U-shaped drainage ditch. An upper water outlet pipe and a lower water outlet pipe are provided inside the retaining wall. A drainage pool is provided on the right side of the retaining wall. The left side of the drainage pool is connected to the retaining wall. A gravel filling structure is laid inside the drainage pool. The right side of the gravel filling structure is communicated with the lower end of the water flow layer, and the left side is communicated with the lower water outlet pipe.

[0007] Preferably, as the present invention, the slope includes a top support surface, a first inclined support surface, an intermediate support surface, and a second inclined support surface that are sequentially connected end to end from top to bottom. A top trench intercepting ditch is provided on the top support surface, and a platform intercepting ditch is provided on the intermediate support surface. The additional layer includes a geogrid, a geocell, and a greening layer. The greening layer is provided on the top support surface, and the geogrid and the geocell are both provided on the first inclined support surface and the second inclined support surface.

[0008] Preferably, as the present invention, two adjacent drainage pipes up and down are connected by a first support mechanism and a second support mechanism. The first support mechanism, the second support mechanism, and the drainage pipe form a triangular structure.

[0009] Preferably, as the present invention, the second support mechanism is a support rod. The two ends of the support rod are respectively fixedly connected to two adjacent drainage pipes up and down.

[0010] Preferably, as the present invention, a communication channel is provided inside the support rod, and the communication channel is communicated with the two drainage pipes up and down. Water holes communicated with the communication channel are provided on the support rod. The inclination degree of the support rod is the same as that of the water flow layer, and the support rod is located in the water flow layer.

[0011] Preferably, as the present invention, the first support mechanism is a rod-shaped or tubular mechanism.

[0012] Preferably, as the present invention, the first support mechanism includes a filter box. The upper end and the lower end of the filter box are respectively fixedly connected to two adjacent drainage pipes up and down, and the lower end of the filter box is communicated with the lower drainage pipe. Filter holes arranged in a circumferential array are provided on two opposite side walls of the filter box. A rotating shaft is provided in the middle of the filter box. The rotating shaft is fixedly connected with a turntable. A plurality of annularly and equidistantly arranged scraping plates are fixedly connected to the edge of the turntable. The side part of the scraping plate is attached to the inner wall of the filter box, and the end part of the scraping plate extends between the pitches of the spiral blades.

[0013] Preferably, in the present invention, the scraping plate is an elastic plate. The spiral blade is sleeved on the rotating shaft, and both ends of the spiral blade are fixedly connected with connecting rings, and the connecting rings are sleeved on the rotating shaft. A plurality of jacks are provided on the rotating shaft, and the connecting ring is fixedly connected to the jack through a locking screw, and the spiral blade can be axially elastically deformed.

[0014] Preferably, in the present invention, a scraping piece is provided at the edge of the scraping plate. The scraping piece fits against the inner wall of the filter box, and the length of the scraping piece is less than the length of the scraping plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The stepped structure design makes the layers fit tightly together, improving the integrity and stability of the support unit, and at the same time facilitating the flow and drainage of rainwater. The use of flexible materials enables the support unit to adapt to the deformation of the slope, avoiding the damage of the support structure caused by soil deformation and extending the service life of the support system. The multi-layer structure works together to effectively block the infiltration of rainwater, timely drain the water on the slope surface and in the soil layer, and at the same time enhance the strength of the slope soil, comprehensively improving the stability of the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a flexible expansive soil slope support system provided by an embodiment of the present invention; Figure 2 is provided by an embodiment of the present invention Figure 1 an enlarged structural diagram of part A in; Figure 3 is a schematic structural diagram of a support rod, a filter box and a drain pipe provided by an embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a filter box and a drain pipe provided by an embodiment of the present invention; Figure 5 is provided by an embodiment of the present invention Figure 4 an enlarged structural diagram of part B in; Figure 6 is a schematic internal structural diagram of a drain pipe provided by an embodiment of the present invention; Figure 7 is provided by an embodiment of the present invention Figure 6 an enlarged structural diagram of part C in.

[0017] In the figure: 1, impervious layer; 2, water flow layer; 3, reinforced soil layer; 4, additional layer; 5, drain pipe; 6, drainage channel; 7, water inlet hole; 8, drain hole; 9, rotating shaft; 10, spiral blade; 11, U-shaped drainage ditch; 12, retaining wall; 13, upper outlet pipe; 14, lower outlet pipe; 15, gravel filling structure; 16, drainage pool; 17, top support surface; 18, first inclined support surface; 19, middle support surface; 20, second inclined support surface; 21, top intercepting ditch; 22, platform intercepting ditch; 23, support rod; 24, filter box; 25, filter hole; 26, rotating shaft; 27, turntable; 28, scraper; 29, connecting ring; 30, jack; 31, locking screw; 32, scraping blade. Detailed implementation mode

[0018] In order to further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail with reference to the accompanying drawings as follows.

[0019] The structure of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] As Figures 1 to 7 shown, a flexible expansive soil slope support system provided by an embodiment of the present invention includes a flexible support unit arranged on the upper side of the expansive soil slope. The flexible support unit is inclined. The flexible support unit includes an impervious layer 1, a water flow layer 2, a reinforced soil layer 3 and an additional layer 4 which are arranged in a close-fitting manner from near to far from the expansive soil slope. The impervious layer 1 and the water flow layer 2 are both stepped structures. The lower surface of the reinforced soil layer 3 is a stepped structure. The upper surface of the reinforced soil layer 3 is a slope structure. A drainage unit is arranged at the lower end of the flexible support unit; A drain pipe 5 is inserted into the flexible support unit. The upper end of the drain pipe 5 extends to the upper side of the slope and has a filter screen. The lower end of the drain pipe 5 is inserted into the expansive soil slope. A drainage channel 6 is arranged inside the drain pipe 5. Water inlet holes 7 and drain holes 8 are arranged on the drain pipe 5. The water inlet holes 7 are located inside the flexible support unit. The drain holes 8 are located inside the expansive soil slope; A rotating shaft 9 is arranged inside the drainage channel 6. Spiral blades 10 are arranged around the rotating shaft 9. The spiral blades 10 are attached to the inner wall of the drain pipe 5. The upper ends of the spiral blades 10 and the rotating shaft 9 extend to the outside of the drainage channel 6.

[0021] Through the above settings, the specific working principle is as follows: The impervious layer 1 is made of impervious materials, such as waterproof membranes, etc. Its stepped structure is adapted to the slope terrain and closely adheres to the surface layer of the slope. When rainwater falls on the slope surface, the impervious layer 1 can effectively block the rainwater from infiltrating into the surface layer of the expansive soil slope, reducing the deformation of the surface expansive soil caused by water absorption, and controlling the adverse effects of water on the slope from the source. The water flow layer 2 is made of gravel, forming a stepped drainage channel. On the one hand, rainwater can flow into the drainage unit through the slope surface. On the other hand, after infiltrating downward into the water flow layer 2, it flows downward along the slope of the stepped structure through the gaps between the gravel, and finally converges into the drainage unit, realizing the rapid drainage of rainwater. The reinforced soil layer 3 is flexible, for example, made of reinforced soil materials. The stepped structure on its lower surface closely adheres to the water flow layer 2, and the slope surface structure on its upper surface adapts to the inclination angle of the slope. When the expansive soil slope deforms, the reinforced soil layer 3 can deform accordingly, absorb the energy generated by the deformation through its own flexibility, and avoid the damage of the support structure caused by rigid support. At the same time, the reinforced soil layer 3 can also enhance the strength and integrity of the soil layer on the surface of the slope.

[0022] The functions of the drain pipe 5 are as follows: First, water conduction and pressure reduction: Part of the water in the flexible support unit enters the drain pipe 5 through the water inlet hole 7, and is introduced into the deep part of the expansive soil slope through the drainage channel 6 from the drain hole 8, reducing the water pressure in the flexible support unit and avoiding the damage of the support structure caused by excessive water pressure. Second, fixing the support unit: The drain pipe 5, as a support structure, is inserted into the slope and the support unit, enhancing the connection between the support unit and the slope and preventing the flexible support unit from landsliding.

[0023] The spiral blade 10 is used to discharge the impurities in the drain pipe 5. Specifically, the spiral blade 10 can be driven to rotate by the rotating shaft 9, and the sediment impurities in the drain pipe 5 can be discharged.

[0024] Specifically, the drainage unit includes a U-shaped drainage ditch 11. A retaining wall 12 is provided on the right side of the U-shaped drainage ditch 11. An upper drain pipe 13 and a lower drain pipe 14 are provided inside the retaining wall 12. A drainage pool 16 is provided on the right side of the retaining wall 12. The left side of the drainage pool 16 is connected to the retaining wall 12. A gravel filling structure 15 is laid inside the drainage pool 16. The right side of the gravel filling structure 15 is communicated with the lower end of the water flow layer 2, and the left side is communicated with the lower drain pipe 14.

[0025] Specifically, the slope surface includes a top supporting surface 17, a first oblique supporting surface 18, an intermediate supporting surface 19 and a second oblique supporting surface 20 which are connected end to end from top to bottom; the top supporting surface 17 is provided with a cutting top intercepting ditch 21, and the intermediate supporting surface 19 is provided with a platform intercepting ditch 22; the additional layer 4 includes a geogrid, a geocell and a greening layer, the greening layer is arranged on the top supporting surface 17, and the geogrid and the geocell are both arranged on the first oblique supporting surface 18 and the second oblique supporting surface 20.

[0026] The additional layer 4 includes geogrids, geocells and a greening layer. The greening layer is arranged on the top supporting surface 17, which plays a role in beautifying the environment and stabilizing the surface soil; the geogrids and geocells are arranged on the first oblique supporting surface 18 and the second oblique supporting surface 20, which can further enhance the tensile strength and shear strength of the surface layer of the slope and improve the stability of the slope. The top intercepting ditch 21 is arranged on the top supporting surface 17 to intercept rainwater above the top of the slope and prevent rainwater from overflowing onto the slope surface; the platform intercepting ditch 22 is arranged on the middle supporting surface 19 to intercept the slope water flow in sections and reduce the scouring of the slope by water flow. The setting of the intercepting ditch effectively reduces the scouring of the slope by rainwater and protects the surface soil of the slope. The use of the material of the additional layer 4 improves the stability and erosion resistance of the surface layer of the slope, and realizes the combination of engineering measures and ecological protection.

[0027] Furthermore, two upper and lower adjacent drain pipes 5 are connected via a first supporting mechanism and a second supporting mechanism, and the first supporting mechanism, the second supporting mechanism and the drain pipe 5 form a triangular structure.

[0028] The second supporting mechanism is a supporting rod 23, and the two ends of the supporting rod 23 are respectively fixedly connected to two upper and lower adjacent drainage pipes 5. Preferably, a connecting passage (not shown in the figure) is provided inside the supporting rod 23, and the connecting passage is connected to the upper and lower drainage pipes 5; a water hole (not shown in the figure) connected to the connecting passage is provided on the supporting rod 23, and the supporting rod 23 and the water flow layer 2 have the same inclination, and the supporting rod 23 is located in the water flow layer 2.

[0029] Through this arrangement, the support rod 23 has the following three effects: First, the support rod 23 can serve as a support for the drain pipe 5 to prevent the drain pipe 5 from bending. On the one hand, it provides protection for the use of the spiral blade 10, and on the other hand, it increases the fixing effect of the flexible support unit and reduces the risk of landslides.

[0030] Second, since the drain pipe 5 is inserted into the expansive soil slope, it can, conversely, provide a limit for the support rod 23. The support rod 23 is located in the water flow layer 2 and can limit the water flow layer 2, reducing the risk of the water flow layer 2 becoming a slip surface (the water flow layer 2 is a layer composed of gravel. The gravel layer has gaps that allow water to pass through, but it is also prone to becoming a slip surface for the flexible support unit).

[0031] Third, since the water holes are located in the water flow layer 2, after the water on the slope enters the drain pipe 5, in addition to being guided into the expansive soil slope, it can also flow into the water flow layer 2 through the water holes. Through this setting, the drainage efficiency can be improved, and the weight of the reinforced soil layer 3 can be reduced, reducing the landslide risk (this part of the water can directly enter the water flow layer 2 without passing through the reinforced soil layer 3). In addition, the water in the water flow layer 2 can also enter the drain pipe 5 through the water holes and the communication channels, thereby discharging the water into the expansive soil slope. In addition, the support rod 23 can enable the water flow between several drain pipes 5. During specific operation, according to different situations, a dynamic water flow system can be formed to make the water flow from the place with high water pressure to the place with low water pressure).

[0032] In one embodiment, the first support mechanism is a rod-shaped or tubular mechanism. For example, it can be set to the same structure as the second support mechanism.

[0033] In another embodiment, the first support mechanism can also be set as follows: The first support mechanism includes a filter box 24. The upper and lower ends of the filter box 24 are respectively fixedly connected to two adjacent drain pipes 5 above and below, and the lower end of the filter box 24 communicates with the lower drain pipe 5; a circumferentially arrayed filter hole 25 is provided on two opposite side walls of the filter box 24. A rotating shaft 26 is provided in the middle of the filter box 24. The rotating shaft 26 is fixedly connected with a turntable 27. A plurality of annularly and equidistantly arranged scraping plates 28 are fixedly connected to the edge of the turntable 27. The side part of the scraping plate 28 is attached to the inner wall of the filter box 24, and the end of the scraping plate 28 extends between the pitches of the spiral blades 10.

[0034] It should be noted that in the prior art, since the first support mechanism is arranged in the reinforced soil layer 3, it is usually set as a rod-shaped or tubular mechanism. Because if it is set as a movable structure, it usually requires a motor drive, but the motor is usually difficult to work continuously underground and is also difficult to repair when damaged.

[0035] And through the above settings in this application, the following effects are achieved: First, the water in the reinforced soil layer 3 can be injected into the drain pipe 5 more quickly and in larger amounts through the filter box 24, thereby reducing the weight of the reinforced soil layer 3.

[0036] Second, when the spiral blade 10 rotates, it can not only push the impurities in the drain pipe 5 upward for discharge, but also simultaneously push the scraper 28 to rotate, so that the scraper 28 cleans the inner wall of the filter box 24, and the impurities therein are pushed and fall into the drain pipe 5, and are pushed and discharged by the spiral blade 10, thereby preventing blockage. Through this setting, not only can power be provided for the rotation of the scraper 28, but also the impurities in the filter box 24 can be discharged together.

[0037] Third, the water on the slope flows into the filter box 24 through the drain pipe 5, and then flows into the reinforced soil layer 3, which improves the infiltration rate of this part of the water in the reinforced soil layer 3 (whether the water flows into or out of the filter box 24 mainly depends on the water pressure inside and outside the filter box 24). Through this setting, according to different situations, a dynamic water circulation system can be formed, so that the water flows from the place with high water pressure to the place with low water pressure.

[0038] Furthermore, the scraper 28 is an elastic plate. The spiral blade 10 is sleeved on the rotating shaft 9. Both ends of the spiral blade 10 are fixedly connected with connecting rings 29, and the connecting rings 29 are sleeved on the rotating shaft 9; a plurality of jacks 30 are opened on the rotating shaft 9, and the connecting rings 29 are fixedly connected to the jacks 30 through locking screws 31, and the spiral blade 10 can be axially elastically deformed (such as a plastic sheet or an aluminum alloy sheet).

[0039] Through this setting, the following advantages are obtained: First, during normal drainage, the spiral blade 10 is in a state of a large pitch. When the drain pipe 5 drains water, the water needs to spiral down through the spiral blade 10. Therefore, a large pitch of the spiral blade 10 helps the water to flow down quickly. And in this state, the spiral blade 10 can just push the scraper 28 to rotate continuously to clean the filter box 24.

[0040] Second, when cleaning and removing impurities, the pitch of the spiral blade 10 can be reduced by adjusting the position of the connecting ring 29. On the one hand, the following effects are achieved when removing impurities: First, a smaller pitch means that the spiral blade 10 pushes the impurities more times per unit length. This can make the impurities receive a more uniform thrust during the transportation process, reduce the accumulation and sliding of impurities, and thus achieve more stable impurity removal. Second, the pitch is small, the inclination angle of the spiral blade 10 is relatively small, and the stirring and impact effect on the impurities during rotation is relatively weak. This helps to maintain the original state of the impurities and reduce the instability such as blockage and overhead caused by excessive disturbance of the impurities. On the other hand, at this time, the pitch of the spiral blade 10 and the scraper 28 are no longer adapted. When rotating, individual scrapers 28 do not extend into the pitch of the spiral blade 10, but are against the spiral blade 10. At this time, the spiral blade 10 can squeeze the scraper 28 to make it elastically bend, and then straighten it after being separated from the spiral blade 10. In this process, the mud and sand impurities sticking on the scraper 28 can be vibrated off. For example, the scraper 28 may be provided in a wave-shaped structure.

[0041] Preferably, a scraper blade 32 is provided at the edge of the scraper 28, and the scraper blade 32 is attached to the inner wall of the filter box 24, and the length of the scraper blade 32 is less than the length of the scraper blade 28 (the part of the scraper 28 that does not overlap with the scraper blade 32 can be elastically bent, providing a basis for the elastic bending of the scraper blade 28). Through this arrangement, on the one hand, the scraper blade 32 can be convenient for cleaning impurities on the inner wall of the filter box 24, and on the other hand, since the filter holes 25 are distributed in a circular array, they are divided into a part where the filter holes 25 are arranged and a gap part between the filter holes 25. When the scraper blade 32 is in different positions, it can block part or all of the filter holes 25, thereby closing the water flow of the filter box 24 or the degree of water flow.

[0042] Furthermore, a shift block (not shown in the figure) is fixedly connected to the upper end of the rotating shaft 9; a motor (not shown in the figure) is also included, and a shift cylinder (not shown in the figure) is fixedly connected to the output end of the motor, and a shift groove (not shown in the figure) is provided inside the shift cylinder, and the shift groove can be engaged with the shift block. The motor and the shift cylinder are external auxiliary devices that can drive different rotating shafts 9 to rotate.

[0043] Working principle of the present invention: The waterproof layer 1 prevents rainwater from penetrating into the surface layer of the expansive soil slope, reducing deformation of the surface expansive soil. Rainwater can flow in through the slope surface, flow into the drainage unit through the slope surface, or penetrate downward into the water flow layer 2, and flow into the drainage unit along the water flow layer 2. When the expansive soil slope is deformed, the waterproof layer 1, the reinforced soil layer 3 and the water flow layer 2 will all deform accordingly, so that the flexible support unit will not be damaged by the deformation of the expansive soil slope. The reinforced soil layer 3 is flexible and can absorb the energy of deformation. The material of the water flow layer 2 is gravel, which can help drainage.

[0044] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flexible expansive soil slope support system, including a flexible support unit arranged on the upper side of the expansive soil slope, characterized in that, The flexible support unit is arranged obliquely. The flexible support unit includes a water isolation layer (1), a water flow layer (2), a reinforced soil layer (3), and an additional layer (4) that are arranged in close contact and arranged in sequence from near to far from the expansive soil slope. The water isolation layer (1) and the water flow layer (2) are both stepped structures. The lower surface of the reinforced soil layer (3) is a stepped structure, and the upper surface of the reinforced soil layer (3) is a slope structure. A drainage unit is provided at the lower end of the flexible support unit; A drain pipe (5) is inserted into the flexible support unit. The upper end of the drain pipe (5) extends to the upper side of the slope and has a filter screen. The lower end of the drain pipe (5) is inserted into the expansive soil slope. A drainage channel (6) is provided inside the drain pipe (5). Water inlet holes (7) and drain holes (8) are provided on the drain pipe (5). The water inlet holes (7) are located inside the flexible support unit, and the drain holes (8) are located inside the expansive soil slope; A rotating shaft (9) is provided in the drainage channel (6). A spiral blade (10) is provided around the rotating shaft (9). The spiral blade (10) is attached to the inner wall of the drain pipe (5), and the upper ends of the spiral blade (10) and the rotating shaft (9) extend to the outside of the drainage channel (6).

2. A flexible expansive soil slope support system according to claim 1, characterized in that: The drainage unit includes a U-shaped drainage ditch (11). A retaining wall (12) is provided on the right side of the U-shaped drainage ditch (11). An upper drain pipe (13) and a lower drain pipe (14) are provided inside the retaining wall (12). A drainage pool (16) is provided on the right side of the retaining wall (12). The left side of the drainage pool (16) is connected to the retaining wall (12). A gravel filling structure (15) is laid inside the drainage pool (16). The right side of the gravel filling structure (15) is communicated with the lower end of the water flow layer (2), and the left side is communicated with the lower drain pipe (14).

3. A flexible expansive soil slope support system according to claim 2, characterized in that: The slope includes a top support surface (17), a first inclined support surface (18), an intermediate support surface (19), and a second inclined support surface (20) that are connected end to end in sequence from top to bottom; A top intercepting ditch (21) is provided on the top support surface (17), and a platform intercepting ditch (22) is provided on the intermediate support surface (19); The additional layer (4) includes a geogrid, a geocell, and a greening layer. The greening layer is provided on the top support surface (17), and the geogrid and the geocell are both provided on the first inclined support surface (18) and the second inclined support surface (20).

4. A flexible expansive soil slope support system according to claim 1, characterized in that: Two adjacent drain pipes (5) up and down are connected by a first support mechanism and a second support mechanism. The first support mechanism, the second support mechanism, and the drain pipe (5) form a triangular structure.

5. A flexible expansive soil slope support system according to claim 4, characterized in that: The second support mechanism is a support rod (23), and two ends of the support rod (23) are respectively fixedly connected to two adjacent upper and lower drain pipes (5).

6. A flexible expansive soil slope support system according to claim 5, wherein: A communication channel is provided inside the support rod (23), and the communication channel communicates with the two upper and lower drain pipes (5); Water holes communicating with the communication channel are provided on the support rod (23). The inclination degree of the support rod (23) is the same as that of the water flow layer (2), and the support rod (23) is located in the water flow layer (2).

7. A flexible expansive soil slope support system according to claim 6, wherein: The first support mechanism is a rod-shaped or tubular mechanism.

8. A flexible expansive soil slope support system according to claim 6, characterized in that: The first support mechanism includes a filter box (24). The upper end and the lower end of the filter box (24) are respectively fixedly connected to two adjacent upper and lower drain pipes (5), and the lower end of the filter box (24) communicates with the lower drain pipe (5); Filter holes (25) arranged in a circumferential array are provided on two opposite side walls of the filter box (24). A rotating shaft (26) is provided in the middle of the filter box (24). The rotating shaft (26) is fixedly connected with a turntable (27). A plurality of annularly and equidistantly arranged scraping plates (28) are fixedly connected to the edge of the turntable (27). The side part of the scraping plate (28) is attached to the inner wall of the filter box (24), and the end part of the scraping plate (28) extends between the pitches of the spiral blades (10).

9. A flexible expansive soil slope support system according to claim 8, wherein: The scraping plate (28) is an elastic plate. The spiral blade (10) is sleeved on the rotating shaft (9). Connection rings (29) are fixedly connected to both ends of the spiral blade (10), and the connection rings (29) are sleeved on the rotating shaft (9); A plurality of jacks (30) are formed on the rotating shaft (9). The connection ring (29) is fixedly connected to the jack (30) through a locking screw (31), and the spiral blade (10) can elastically deform axially.

10. A flexible expansive soil slope support system according to claim 9, characterized in that: A scraping piece (32) is provided at the edge of the scraping plate (28). The scraping piece (32) is attached to the inner wall of the filter box (24), and the length of the scraping piece (32) is smaller than the length of the scraping plate (28).

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