An expansive soil slope support structure and construction method

Abstract

The present invention discloses an expansive soil slope support structure and a construction method, comprising: a support plate, which is fixed on the stepped expansive soil slope and fits thereto; an anchor rod, which includes an outer rod passing through the support plate and inserted into the expansive soil slope, and a reinforcement component is arranged on the outer rod; a reinforcement agent is pressurized and injected into the outer rod and penetrates into the expansive soil slope; a backfill soil layer, which covers the top end of the support plate, and the top end of the backfill soil layer is set as an inclined surface; a drainage component for preventing water accumulation is arranged on the backfill soil layer, and soil-fixing plants are planted on the backfill soil layer; a baffle, which is arranged at the bottom end of the expansive soil slope, and both the support plate and the backfill soil layer are in contact with the side wall of the baffle, and the drainage component passes through the baffle. The support structure of the present invention is convenient for construction, has high construction efficiency, greatly reduces the construction period, and at the same time organically combines anchoring, water blocking, plant anti-seepage, etc., greatly reduces the construction difficulty, reduces the support cost, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention belongs to the technical field of slope support, and particularly relates to a swelling soil slope support structure and a construction method thereof. Background Art

[0002] Swelling soil refers to cohesive soil that expands violently in volume after being soaked in water and shrinks significantly in volume after losing water. It is widely distributed in China, mainly formed by residual or residual slope deposits. Due to the characteristics of swelling soil, swelling soil slopes are extremely prone to disasters such as collapse and landslide, seriously affecting the safety of the passing roads.

[0003] At present, there are many structures and forms for dealing with swelling soil slopes, such as soil replacement, swelling soil improvement, full paving of grouted rubble masonry slope protection, slope toe retaining wall, greening the slope after reducing the slope ratio, reinforced soil slope protection, rainwater leakage prevention and other measures and methods. However, from the investigation of the actual engineering situation, it is found that soil replacement or soil improvement will increase the project cost and the construction period is relatively long. Full paving of grouted rubble masonry not only has a high cost and is not environmentally friendly, but also the slope stones will arch and crack after a period of use, and the slope will collapse after a long time. Using only the slope toe retaining wall structure alone cannot effectively deal with swelling soil slopes, and the cost of the reinforced soil retaining wall slope protection is too high.

[0004] Therefore, the present application designs a swelling soil slope support structure and a construction method to solve the above technical problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a swelling soil slope support structure and a construction method thereof.

[0006] To achieve the above object, the present invention provides a swelling soil slope support structure, including:

[0007] A support plate, which is fixed on the swelling soil slope excavated in a stepped shape, and the support plate is attached to the surface of the swelling soil slope;

[0008] An anchor rod, the anchor rod includes an outer rod that passes through the support plate and is inserted into the swelling soil slope, and a reinforcement component is arranged on the outer rod; the outer rod is pressurized to inject a reinforcement agent into the swelling soil slope;

[0009] A backfill soil layer, which covers the top of the support plate, and the top of the backfill soil layer is set as an inclined surface; a drainage component for preventing water accumulation is arranged on the backfill soil layer, and soil-fixing plants are planted on the backfill soil layer;

[0010] A baffle, which is arranged at the bottom end of the swelling soil slope, and both the support plate and the backfill soil layer are abutted against the side wall of the baffle, and the drainage component passes through the baffle.

[0011] Preferably, the reinforcement component includes a reinforcement hole penetrating through the side wall of the outer rod. A reinforcement rod is arranged in the reinforcement hole. One end of the reinforcement rod extends into the inner cavity of the outer rod and is fixedly connected with a contact head arranged in an arc shape. An inner rod is inserted into the outer rod. The outer wall of the inner rod abuts against the contact head. During the process of inserting the outer rod, the tip of the reinforcement rod is pushed out of the reinforcement hole and inserted into the expansive soil.

[0012] Preferably, the reinforcement rod is provided with an extension hole penetrating along the extending direction. A hollow extension rod is hermetically slidably connected in the extension hole. A bearing plate is fixedly connected at the inlet of the inner cavity of the extension rod. One end of the extension rod away from the inner rod extends out of the extension hole and is fixedly connected with a thorn head.

[0013] Preferably, a plurality of liquid inlet holes are formed in the extension rod. A containing cavity is formed at the bottom end of the liquid inlet hole. A pressure-bearing spring is fixedly connected at the bottom end of the containing cavity. The top end of the pressure-bearing spring is fixedly connected with a frustum-shaped pressure-bearing block. The pressure-bearing block blocks the outlet of the liquid inlet hole. A plurality of liquid outlet holes are formed in the bottom end of the containing cavity in a penetrating manner. The outlets of the liquid outlet holes are communicated with the inner cavity of the extension rod.

[0014] Preferably, a plurality of seepage holes are formed in the outer wall of the extension rod. After the reinforcement liquid is pressurized, it seeps out from the seepage holes to improve the soil quality of the expansive soil slope.

[0015] Preferably, the support plate includes a plurality of horizontally arranged first plates and a plurality of longitudinally arranged second plates. The first plates are horizontally attached to the step horizontal planes of the expansive soil slope through the anchor rods. The second plates are longitudinally attached to the step vertical planes of the expansive soil slope through the anchor rods. The contact surfaces of the first plates and the second plates are arranged in an inclined angle and joined together.

[0016] Preferably, both the first plates and the second plates include a plurality of joined plates that are sequentially lapped. The anchor rods respectively penetrate through the joined plates and fixedly connect the joined plates to the expansive soil slope. First joints and second joints are respectively arranged at the contact ends of the two mutually joined joined plates. A bolt groove is formed at the top end of the first joint. A nut corresponding to the bolt groove is embedded and fixedly connected at the bottom end of the second joint. A bolt passing through the bolt groove is threadedly connected with the nut.

[0017] Preferably, a soil-fixing grid is arranged in the backfill soil layer. The bottom end of the soil-fixing grid is fixedly connected with the support plate. A geogrid for fixing soil is covered at the top end of the backfill soil layer. The soil-fixing plants are planted in the spaces of the geogrid.

[0018] Preferably, the drainage component includes a plurality of mutually connected water channels arranged on the surface of the backfill soil layer. The water channels are located below the geogrid. A plurality of water outlet holes are formed in the baffle plate. The water channels are communicated with the water outlet holes.

[0019] A construction method for a support structure of an expansive soil slope, comprising the following construction steps:

[0020] Step 1: Excavation of expansive soil. The surface of the slope to be reinforced is excavated into a stepped expansive soil slope.

[0021] Step 2: Laying of the support plate. The support plate is attached to the expansive soil slope and ensured to be relatively sealed and impermeable.

[0022] Step 3: Construction of the anchor rod. The anchor rod is passed through the support plate and inserted into the expansive soil slope, and then the reinforcement component is unfolded to fix the support plate.

[0023] Step 4: Pressurized grouting. The reinforcement agent is injected into the inner cavity of the outer rod of the anchor rod under high pressure through high-pressure grouting equipment, and the reinforcement agent penetrates into the expansive soil outside the anchor rod to modify and reinforce the expansive soil.

[0024] Step 5: Construction of the baffle. The baffle is constructed at the lowest point of the expansive soil slope according to the design requirements.

[0025] Step 6: Construction of the backfill soil layer. The backfill soil layer is laid on the support plate and tamped, and the height of the backfill soil layer is not higher than the top of the baffle.

[0026] Step 7: Construction of the drainage component. The drainage component is constructed on the backfill soil layer for drainage.

[0027] Step 8: Planting of fixed plants. Soil-fixing plants with developed roots are planted on the backfill soil layer to biologically fix the backfill soil layer.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention discloses a support structure and a construction method for an expansive soil slope. The support plate is attached and covered on the stepped expansive soil slope, and then fixed by the anchor rod, reducing the precipitation penetrating into the expansive soil slope, reducing the geological changes caused by the expansion and contraction of the expansive soil, improving the stability of the expansive soil slope, and reducing the occurrence probability of geological disasters such as collapse and landslide; The anchor rod includes an outer rod and a reinforcement component, which can improve the bonding strength between the anchor rod and the coating and improve the stability of the support plate; The reinforcement agent is injected into the anchor rod under high pressure, and the reinforcement agent penetrates into the expansive soil slope under high pressure to improve the characteristics of the expansive soil, increase the adhesion between the components of the expansive soil, reduce the amplitude of its expansion and contraction, and thus improve the stability; The backfill soil layer is laid on the support plate to cover the support plate, improving the aesthetics. The drainage component accelerates the drainage during rainfall, reduces the infiltration of rainwater, and at the same time, the planted soil-fixing plants improve the bonding of the backfill soil layer and reduce the soil erosion of the backfill soil layer; The baffle is arranged at the lowest point of the expansive soil slope to support and block the backfill soil layer.

[0029] The supporting structure of the present invention is convenient for construction and has high construction efficiency, greatly reducing the construction period. At the same time, it combines anchoring, water blocking, plant anti-seepage, etc. organically, greatly reducing the construction difficulty and the cost of support, and is suitable for large-scale popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0031] Figure 1 is an axonometric view of the expansive soil slope supporting structure of the present invention;

[0032] Figure 2 is a schematic diagram of the anchor rod structure of the present invention;

[0033] Figure 3 For the present invention Figure 2 is a partial enlarged view of A in;

[0034] Figure 4 is a schematic diagram of the bearing plate structure of the present invention;

[0035] Figure 5 For the present invention Figure 4 is a partial enlarged view of B in;

[0036] Figure 6 is an axonometric view of the anchor rod of the present invention;

[0037] Figure 7 is a side view of the support plate of the present invention;

[0038] Figure 8 For the present invention Figure 7 is a partial enlarged view of C in;

[0039] Figure 9 is a schematic diagram of the structure of the splicing plate of the present invention;

[0040] In the figure: 1, expansive soil slope; 2, support plate; 3, anchor rod; 4, backfill soil layer; 5, baffle; 6, soil-fixing plant; 21, first plate; 22, second plate; 23, assembled plate; 24, first joint; 25, second joint; 26, bolt groove; 27, nut; 28, bolt hole; 29, first screw sleeve; 210, gasket; 31, outer rod; 32, reinforcement hole; 33, reinforcement rod; 34, contact head; 35, inner rod; 36, extension hole; 37, extension rod; 38, bearing plate; 39, barb; 310, liquid inlet hole; 311, accommodation cavity; 312, pressure-bearing spring; 313, pressure-bearing block; 314, liquid outlet hole; 315, seepage hole; 316, grouting channel; 317, grout outlet hole; 318, second screw sleeve; 319, drill bit; 320, soil guiding groove; 41, geogrid; 42, soil-fixing grid; 43, water channel; 45, extrusion pad; 51, water outlet hole. Detailed implementation manners

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0043] Referring to Figures 1-9 As shown, this embodiment provides a support structure for an expansive soil slope, including:

[0044] A support plate 2, which is fixed on the expansive soil slope 1 excavated into a stepped shape, and the support plate 2 is in contact with the surface of the expansive soil slope 1;

[0045] An anchor rod 3, the anchor rod 3 includes an outer rod 31 that passes through the support plate 2 and is inserted into the expansive soil slope 1, and a reinforcement component is arranged on the outer rod 31; a reinforcement agent is pressurized and injected into the outer rod 31 to penetrate into the expansive soil slope 1;

[0046] A backfill soil layer 4, which covers the top of the support plate 2, and the top of the backfill soil layer 4 is set as an inclined surface; a drainage component for preventing water accumulation is arranged on the backfill soil layer 4, and soil-fixing plants 6 are planted on the backfill soil layer 4;

[0047] A baffle 5, which is arranged at the bottom of the expansive soil slope 1, and both the support plate 2 and the backfill soil layer 4 are in contact with the side wall of the baffle 5, and the drainage component passes through the baffle 5.

[0048] The present invention discloses a support structure and construction method for an expansive soil slope 1. The support plate 2 is attached and covered on the expansive soil slope 1 excavated in a stepped shape, and then fixed by the anchor rod 3, reducing the precipitation penetrating into the expansive soil slope 1, reducing the geological changes caused by the expansion and contraction of the expansive soil, improving the stability of the expansive soil slope 1, and reducing the occurrence probability of geological disasters such as collapse and landslide; the anchor rod 3 includes an outer rod 31 and a reinforcement component, which can improve the bonding strength between the anchor rod 3 and the coating and improve the stability of the support plate 2; the anchor rod 3 injects a reinforcement agent under high pressure, and the reinforcement agent penetrates into the expansive soil slope 1 under high pressure to improve the characteristics of the expansive soil, increase the adhesion between the components of the expansive soil, reduce the amplitude of its expansion and contraction, and thus improve the stability; a backfill soil layer 4 is laid on the support plate 2 to cover the support plate 2, improving the aesthetics, and the drainage component accelerates the drainage during rainfall, reducing the infiltration of rainwater. At the same time, the planted soil-fixing plants 6 improve the bonding to the backfill soil layer 4 and reduce the soil erosion of the backfill soil layer 4; the baffle 5 is arranged at the lowest point of the expansive soil slope 1 to support and block the backfill soil layer 4.

[0049] For a further optimized solution, the reinforcement component includes a reinforcement hole 32 penetrating through the side wall of the outer rod 31. A reinforcement rod 33 is arranged in the reinforcement hole 32. One end of the reinforcement rod 33 extends into the inner cavity of the outer rod 31 and is fixedly connected with a contact head 34 arranged in an arc shape; an inner rod 35 is inserted into the outer rod 31, and the outer wall of the inner rod 35 abuts against the contact head 34. During the insertion process of the outer rod 31, the tip of the reinforcement rod 33 is pushed out of the reinforcement hole 32 and inserted into the expansive soil. A second screw sleeve 318 is fixedly connected to the top end of the inner cavity of the outer rod 31, and the inner rod 35 is screwed into the inner cavity of the outer rod 31 through the thread adapted to the outer wall of the second screw sleeve 318. The bottom end of the inner rod 35 is in a tapered shape. After contacting the contact head 34, it pushes the reinforcement rod 33 to extend along the reinforcement hole 32 and insert into the soil, increasing the anti-pulling ability of the outer rod 31 and the bonding energy with the external soil layer.

[0050] Furthermore, a drill bit 319 is fixedly connected to the bottom end of the outer rod 31. An inclined soil guiding groove 320 is arranged on the outer wall of the drill bit 319, increasing the tunneling ability of the drill bit 319 and improving the implantation efficiency.

[0051] For a further optimized solution, an extension hole 36 is penetratingly arranged along the extending direction of the reinforcement rod 33. A hollow extension rod 37 is hermetically slidably connected in the extension hole 36; a bearing plate 38 is fixedly connected to the inlet of the inner cavity of the extension rod 37; one end of the extension rod 37 far from the inner rod 35 extends out of the extension hole 36 and is fixedly connected with a thorn head 39. When high-pressure grouting is carried out in the inner cavity of the outer rod 31, the high-pressure reinforcement liquid acts on the bearing plate 38, pushing the extension rod 37 to slide in a direction away from the outer rod 31. The arrangement of the thorn head 39 increases the piercing ability of the extension rod 37.

[0052] For a further optimized solution, a number of liquid inlet holes 310 are formed in the extension rod 37. At the bottom end of each liquid inlet hole 310, there is a receiving cavity 311. At the bottom end of the receiving cavity 311, a pressure-bearing spring 312 is fixedly connected. At the top end of the pressure-bearing spring 312, a frustum-shaped pressure-bearing block 313 is fixedly connected, and the pressure-bearing block 313 blocks the outlet of the liquid inlet hole 310. A number of liquid outlet holes 314 are formed through the bottom end of the receiving cavity 311, and the outlets of the liquid outlet holes 314 communicate with the inner cavity of the extension rod 37. The high-pressure reinforcement liquid enters the liquid inlet hole 310 and acts on the pressure-bearing block 313, pushing the pressure-bearing block 313 to compress the pressure-bearing spring 312, so that the reinforcement liquid enters the receiving cavity 311 and finally enters the inner cavity of the extension rod 37 through the liquid outlet holes 314, which facilitates preparing for subsequent high-pressure seepage while pushing the extension rod 37.

[0053] Furthermore, slurry outlet holes 317 are formed through the outer wall of the inner rod 35, and the slurry outlet holes 317 communicate with the grouting channel 316 inside the inner rod 35. After the reinforcement liquid enters the grouting channel 316, it enters the inner cavity of the outer rod 31 and then enters the extension rod 37.

[0054] For a further optimized solution, a number of seepage holes 315 are formed through the outer wall of the extension rod 37. After the reinforcement liquid is pressurized, it seeps out from the seepage holes 315 to improve the soil quality of the expansive soil slope 1. The high-pressure reinforcement liquid entering the inner cavity of the extension rod 37 shoots out from the seepage holes 315 under high pressure and seeps into the surrounding expansive soil, realizing the modification of the expansive soil and making the anchor rod 3 more tightly combined with the expansive soil at the same time.

[0055] Furthermore, the reinforcement liquid in this embodiment is a mixed solution of urea-hydrolyzing bacteria, calcium chloride, and urea. The urea-hydrolyzing bacteria utilize urea to react to produce carbonate ions and react with the provided calcium source, and finally a calcium carbonate cementation structure is formed between soil particles, thereby strengthening the expansive soil. By injecting microorganisms into the expansive soil to induce calcium carbonate precipitation, the binding property of the expansive soil is improved. Using the microbial liquid injection method to reinforce the slope can reduce the excavation of the slope and environmental damage.

[0056] For a further optimized solution, the support plate 2 includes a number of horizontally arranged first plates 21 and a number of longitudinally arranged second plates 22. The first plates 21 are horizontally attached to the stepped horizontal plane of the expansive soil slope 1 through the anchor rods 3, and the second plates 22 are longitudinally attached to the stepped vertical surface of the expansive soil slope 1 through the anchor rods 3; the contact surfaces of the first plates 21 and the second plates 22 are arranged in an inclined angle splicing manner. The splicing surface of the first plates 21 and the second plates 22 is set as an inclined plane, using the principle of mortise and tenon, and a pressing pad 45 is arranged between them to improve the sealing performance.

[0057] For a further optimized solution, both the first plate 21 and the second plate 22 include a number of spliced plates 23 that are sequentially lapped; the anchor rods 3 respectively penetrate through the spliced plates 23 and fix the spliced plates 23 to the expansive soil slope 1; first joints 24 and second joints 25 are respectively arranged at the contact ends of the two spliced plates 23 that are spliced with each other. A bolt groove 26 is opened at the top end of the first joint 24, and a nut 27 corresponding to the bolt groove 26 is fixedly embedded at the bottom end of the second joint 25. A bolt passing through the bolt groove 26 is threadedly fixed to the nut 27. A bolt hole 28 is opened between the bolt groove 26 and the nut 27. The first joint 24 and the second joint 25 are spliced and fixed by bolts. There is no need for on-site casting, and the construction efficiency is high. The gasket 210 between the first joint 24 and the second joint 25 increases the sealing performance.

[0058] For a further optimized solution, soil-fixing grids 42 are arranged in the backfill soil layer 4, and the bottom ends of the soil-fixing grids 42 are fixedly connected to the support plate 2; a geogrid 41 for fixing soil is covered on the top end of the backfill soil layer 4; soil-fixing plants 6 are planted in the spaces of the geogrid 41. The soil-fixing grids 42 serve as skeletons and are fixed on the support plate 2, playing an effect of supporting the backfill soil layer 4; the geogrid 41 is covered on the backfill soil layer 4, reducing the scouring of rainwater. Combined with the soil-fixing plants 6 in the spaces, the scouring of rainwater on the backfill soil layer 4 is greatly reduced.

[0059] For a further optimized solution, the drainage assembly includes a number of mutually connected water channels 43 arranged on the surface of the backfill soil layer 4, and the water channels 43 are located below the geogrid 41; a number of water outlet holes 51 are opened on the baffle 5, and the water channels 43 are communicated with the water outlet holes 51. The water channels 43 are arranged below the geogrid 41, quickly collecting rainwater and discharging it through the water outlet holes 51, reducing the retention time of rainwater and the infiltration of rainwater.

[0060] A construction method for a support structure of an expansive soil slope 1 includes the following construction steps:

[0061] Step 1: Excavation of expansive soil. The surface of the slope to be reinforced is dug into a stepped expansive soil slope 1; the construction site is cleaned, and the expansive soil to be supported is excavated into a stepped shape to facilitate subsequent construction;

[0062] Step 2: Laying the support plate 2. The support plate 2 is attached to the expansive soil slope 1 and ensured to be relatively sealed and waterproof; the spliced plates 23 are assembled by bolts to form the first plate 21 and the second plate 22, and then laid on the steps of the expansive soil slope 1 and temporarily fixed;

[0063] Step 3: Construction of the anchor rod 3. Pass the anchor rod 3 through the support plate 2 and insert it into the expansive soil slope 1, and then deploy the reinforcement assembly to fix the support plate 2. Rotate the outer rod 31 mechanically. Through the thread of the outer rod 31 and the first screw sleeve 29 provided on the splicing plate 23, the outer rod 31 is implanted into the expansive soil, and then the inner rod 35 is rotated and implanted again to make the reinforcement rod 33 extend out.

[0064] Step 4: Pressure grouting. Inject the reinforcement agent into the inner cavity of the outer rod 31 of the anchor rod 3 under high pressure through high-pressure grouting equipment. The reinforcement agent penetrates into the expansive soil outside the anchor rod 3 to modify and reinforce the expansive soil. Connect the grouting channel 316 of the inner rod 35 to the grouting equipment, and then inject the reinforcement liquid under pressure. The reinforcement liquid first pushes the extension rod 37 to extend out to increase stability, and then seeps out from the seepage holes 315 of the extension rod 37 into the expansive soil. After the reinforcement liquid reacts, the expansive soil is improved.

[0065] Step 5: Construction of the baffle 5. Construct the baffle 5 at the lowest point of the expansive soil slope 1 according to the design requirements. Construct the baffle 5 and reserve drainage holes to facilitate drainage.

[0066] Step 6: Construction of the backfill soil layer 4. Lay the backfill soil layer 4 on the support plate 2 and tamp it. The height of the backfill soil layer 4 is not higher than the top end of the baffle 5. Install the soil-fixing grid 42, then lay the backfill soil layer 4, and tamp the backfill soil layer 4.

[0067] Step 7: Construction of the drainage assembly. Construct the drainage assembly on the backfill soil layer 4 for drainage. Construct the water channel 43 on the backfill soil layer 4 so that the low end of the water channel 43 is communicated with the water outlet hole 51. Finally, cover a layer of geogrid 41 on the backfill soil layer 4 and fix the geogrid 41.

[0068] Step 8: Plant fixed plants. Plant soil-fixing plants 6 with developed roots on the backfill soil layer 4 to biologically fix the backfill soil layer 4. Plant the selected soil-fixing plants 6, and the soil-fixing plants 6 are preferably varieties with developed roots.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0070] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An expansive soil slope support structure, characterized in that, Comprising: A support plate (2), the support plate (2) being fixed on an expansive soil slope (1) excavated in a stepped shape, and the support plate (2) being in contact with the surface of the expansive soil slope (1); An anchor rod (3), the anchor rod (3) including an outer rod (31) passing through the support plate (2) and inserted into the expansive soil slope (1), and a reinforcement component being provided on the outer rod (31); a reinforcement agent is pressure-injected into the outer rod (31) and penetrates into the expansive soil slope (1); A backfill soil layer (4), the backfill soil layer (4) covering the top end of the support plate (2), and the top end of the backfill soil layer (4) being arranged as an inclined surface; a drainage component for preventing water accumulation is provided on the backfill soil layer (4), and soil-fixing plants (6) are planted on the backfill soil layer (4); A baffle plate (5), the baffle plate (5) being arranged at the bottom end of the expansive soil slope (1), and both the support plate (2) and the backfill soil layer (4) abutting against the side wall of the baffle plate (5), and the drainage component passing through the baffle plate (5); The reinforcement component includes a reinforcement hole (32) penetratingly opened on the side wall of the outer rod (31), a reinforcement rod (33) being arranged in the reinforcement hole (32), and one end of the reinforcement rod (33) extending into the inner cavity of the outer rod (31) and fixedly connected with a contact head (34) arranged in an arc shape; an inner rod (35) is inserted into the outer rod (31), and the outer wall of the inner rod (35) abuts against the contact head (34). During the process of inserting the outer rod (31), the tip of the reinforcement rod (33) is pushed out of the reinforcement hole (32) and inserted into the expansive soil; The reinforcement rod (33) is penetratingly provided with an extension hole (36) along the extending direction, and a hollow extension rod (37) is hermetically slidably connected in the extension hole (36); a bearing plate (38) is fixedly connected at the inlet of the inner cavity of the extension rod (37); one end of the extension rod (37) far from the inner rod (35) extends out of the extension hole (36) and is fixedly connected with a barb (39); A plurality of liquid inlet holes (310) are opened on the extension rod (37), a receiving cavity (311) is opened at the bottom end of the liquid inlet hole (310), a pressure-bearing spring (312) is fixedly connected to the bottom end of the receiving cavity (311), a frustum-shaped pressure-bearing block (313) is fixedly connected to the top end of the pressure-bearing spring (312), and the pressure-bearing block (313) blocks the outlet of the liquid inlet hole (310); a plurality of liquid outlet holes (314) are penetratingly opened at the bottom end of the receiving cavity (311), and the outlet of the liquid outlet hole (314) is communicated with the inner cavity of the extension rod (37).

2. The swelling soil slope support structure according to claim 1, wherein: A plurality of seepage holes (315) are penetratingly opened on the outer wall of the extension rod (37), and after the reinforcement liquid is pressurized, it seeps out from the seepage holes (315) to improve the soil quality of the expansive soil slope (1).

3. The swelling soil slope support structure according to claim 1, characterized in that: The support plate (2) includes a number of horizontally arranged first plates (21) and a number of longitudinally arranged second plates (22). The first plates (21) are horizontally attached to the stepped horizontal plane of the expansive soil slope (1) through the anchor rods (3), and the second plates (22) are longitudinally attached to the stepped vertical surface of the expansive soil slope (1) through the anchor rods (3); the contact surfaces of the first plates (21) and the second plates (22) are arranged in an inclined angle and joined together.

4. The swelling soil slope support structure according to claim 3, characterized in that: Both the first plates (21) and the second plates (22) include a number of joined plates (23) that are sequentially lapped; the anchor rods (3) respectively penetrate through the joined plates (23) and fix the joined plates (23) to the expansive soil slope (1); the contact ends of two mutually joined joined plates (23) are respectively provided with a first joint (24) and a second joint (25). A bolt groove (26) is opened at the top end of the first joint (24), and a nut (27) corresponding to the bolt groove (26) is embedded and fixed at the bottom end of the second joint (25). A bolt passing through the bolt groove (26) is threadedly fixed to the nut (27).

5. The swelling soil slope support structure according to claim 1, characterized in that: A soil-fixing grid (42) is arranged in the backfill soil layer (4), and the bottom end of the soil-fixing grid (42) is fixedly connected to the support plate (2); a geogrid (41) for fixing soil is covered at the top end of the backfill soil layer (4); the soil-fixing plants (6) are planted in the spaces of the geogrid (41).

6. The swelling soil slope support structure according to claim 5, characterized in that: The drainage assembly includes a number of mutually connected water channels (43) arranged on the surface of the backfill soil layer (4), and the water channels (43) are located below the geogrid (41); a number of water outlet holes (51) are opened on the baffle (5), and the water channels (43) are communicated with the water outlet holes (51).

7. A construction method for an expansive soil slope support structure, according to the expansive soil slope support structure described in any one of claims 1-6, characterized in that It includes the following construction steps: Step 1: Excavation of expansive soil. The surface of the slope to be reinforced is dug into a stepped expansive soil slope (1). Step 2: Laying the support plate (2). The support plate (2) is attached to the expansive soil slope (1) and ensured to be relatively sealed and impermeable. Step 3: Construction of the anchor rods (3). The anchor rods (3) are passed through the support plate (2) and inserted into the expansive soil slope (1), and then the reinforcement assembly is unfolded to fix the support plate (2). Step 4: Pressurized grouting. A reinforcing agent is injected into the inner cavity of the outer rod (31) of the anchor rod (3) under high pressure through high-pressure grouting equipment, and the reinforcing agent penetrates into the expansive soil outside the anchor rod (3) to modify and reinforce the expansive soil. Step 5: Construction of the baffle (5). The baffle (5) is constructed at the lowest point of the expansive soil slope (1) according to the design requirements. Step 6: Construction of the backfill soil layer (4). The backfill soil layer (4) is laid on the support plate (2) and compacted, and the height of the backfill soil layer (4) is not higher than the top end of the baffle (5). Step 7: Construction of the drainage assembly. The drainage assembly is constructed on the backfill soil layer (4) for drainage. Step 8: Planting fixed plants. Root-developed soil-fixing plants (6) are planted on the backfill soil layer (4) to biologically fix the backfill soil layer (4).

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