A safe and eco-friendly road slope landslide prevention supporting method

Abstract

The application discloses a road slope anti-landslide supporting method with safety and ecological environmental protection, and relates to the field of road slope anti-landslide supporting methods. The road slope anti-landslide supporting method comprises an anti-scouring structure (2) and a local pressure grouting anti-slide pile (3). The supporting frame (24) of the anti-scouring structure (2) is a long rectangular container without a closed top, and the bottom is a grid (241). The inside of the anti-scouring structure (2) is filled with matrix soil (21) and water-repellent agent modified soil (22) from bottom to top. The root system of vegetation (23) is located in the matrix soil (21), and the top of the vegetation (23) exceeds the water-repellent agent modified soil (22). The upper end of the local pressure grouting anti-slide pile (3) is connected with the bottom of the supporting frame (24) of the anti-scouring structure (2), and the other end is vertically downward into the slope body. The drainage ditch (4) is arranged along the slope surface from top to bottom. The vegetation (23) is selected from tall fescue, and the matrix soil (21) is selected from modified dredged soil. The application can not only beautify the supporting structure, but also avoid the direct impact of rainfall on the soil body, improve the stability of the slope body, and beautify the environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of road slope support, in particular to a road slope landslide prevention support method with safety and ecological environmental protection. BACKGROUND

[0002] The slope is an important part of the road. In actual engineering, the natural slope is often weak and loose, and is prone to shallow landslide. Therefore, the slope needs to be reinforced. Under the condition of rainfall, the soil is loose and lost due to rainwater erosion, and the specific gravity increases due to rainwater infiltration, which easily causes slope landslide. In order to prevent landslide caused by rainfall, the slope needs to be reinforced by using support structure.

[0003] The document with application number 202120619953.1 discloses a prefabricated support structure for road slope reinforcement. The blocking plate can effectively block the sandstone rolling on the slope, improve the reliability and stability, and improve the safety factor of the workers during construction. However, the prefabricated support structure for road slope reinforcement only blocks the soil inside the frame by the first and second protective screens. In heavy rainfall, the soil and water mix to produce a large amount of mud flow, which still causes the slope to collapse and is difficult to coagulate and consolidate the soil fundamentally.

[0004] The Chinese patent with application number 202323081641.8 discloses a prefabricated support structure for road slope. The planting cylinder can plant green plants on the slope, and the roots of the green plants further tighten the slope soil to avoid the loosening and loss of the soil inside the frame. At the same time, the brush can buffer the heavy rainfall. However, the problem is that the number of planting cylinders is limited, and a not small area is directly affected by rainwater. In addition, this structure only buffers the impact of rainfall on the soil, and cannot drain water in time. Rainwater will continue to infiltrate, increase the specific gravity, increase the vertical force, and cause the formation of potential sliding surface of the slope.

[0005] At present, the primary task of road slope engineering is to follow the safety principle and eliminate landslide safety hazards through slope reinforcement. However, while preventing rainfall-induced landslide, sufficient attention should also be paid to following the ecological environment coordination principle, and the selected green plants should be coordinated with the surrounding environment. The greening process of the slope should be consistent with the scenery nearby, so as to form coordination between the scenery and achieve the compatibility of road slope reinforcement and greening.

[0006] In view of this, in order to solve the actual problem, a road slope landslide prevention support method with safety and ecological environmental protection is proposed to overcome the shortcomings of the existing structure. SUMMARY

[0007] In order to overcome the deficiencies in existing structures, the purpose of the present invention is to provide a road slope anti-landslide support method that takes into account both safety and ecological environmental protection, while preventing landslides caused by rainfall, achieving ecological beauty and coordination with the surrounding environment.

[0008] To achieve the above-mentioned purpose of the present invention, a road slope anti-landslide support method that takes both safety and ecological protection into consideration adopts the following technical solutions:

[0009] The present invention provides a method for supporting road slopes against landslides, which takes both safety and ecological protection into consideration. The prefabricated supporting structure for road slopes adopted in the design includes an anti-scour structure, local grouting anti-slip piles and a drainage ditch. The supporting frame of the anti-scour structure is a rectangular container with an open top and a mesh grid at the bottom. The interior of the anti-scour structure is filled with matrix soil and water-repellent modified soil from bottom to top. The roots of vegetation are located in the matrix soil, and the tops of the vegetation extend beyond the water-repellent modified soil. The upper ends of the local grouting anti-slip piles are connected to the bottom of the supporting frame of the anti-scour structure, and the lower parts of the local grouting anti-slip piles pass through the potential sliding surface of the slope body. After grouting, loose piles are formed, which enhances interface friction and makes it difficult for a fracture surface to form. The local grouting anti-slip piles are composed of a combination of rigid piles and bulk piles. The rigid piles are as long as the local grouting anti-slip piles. The bulk piles are located in the lower grouting section of the rigid piles and surround the lower part of the rigid piles. The lower part of the bulk piles passes through the potential slip surface of the slope. The drainage channel is arranged obliquely along the slope surface from top to bottom and is connected to the anti-scour structure through an open mortise and tenon structure. A flood interception ditch is also provided in the upper flat part of the road slope, and the water outlet of the flood interception ditch is connected to the upper water inlet of the drainage channel.

[0010] The vegetation is tall fescue, which has strong growth ability, a well-developed root system, high temperature resistance, and strong stress resistance. The matrix soil is modified dredged soil, and 4-10 g of a high molecular weight water-absorbing resin, 0.4-0.7 g of polyacrylamide, and 30-50 g of straw are added to every 1 kg of dredged soil. The water repellent added to the water repellent-modified soil is octadecyl primary amine, and the addition amount is 0.6%-1.0% of the total mass of the water repellent-modified soil. The thickness of the matrix soil is 15-30 cm, and the thickness of the water repellent-modified soil is 10-20 cm.

[0011] The depth H of the local grouting anti-slide pile below the sliding surface should not be less than the critical value H0, which is calculated according to the following formula:

[0012] H0=d*tanα;

[0013] Where: d is the radius of the loose pile; α is the angle between the tangent of the slip surface and the horizontal direction at the intersection of the rigid pile and the slip surface.

[0014] Preferably, the open mortise and tenon structure is composed of two parts, namely the upper open mortise and tenon structure and the lower open mortise and tenon structure; the upper open mortise and tenon structure is the outer wall of the drainage ditch, and the lower open mortise and tenon structure is the outer wall of the anti-scour structure; the mortise and tenon parts of the upper open mortise and tenon structure and the lower open mortise and tenon structure can be mutually attached and fixed by clamping.

[0015] Generally, the volume of the granular pile located in the lower part of the sliding surface accounts for 40%-70% of the overall volume of the granular pile.

[0016] Preferably, the partial grouting anti-slide pile is arranged in a plum blossom shape on the slope surface, so as to facilitate the stress redistribution of the soil body, form a soil arch effect, and resist the sliding force.

[0017] Preferably, a plurality of sealing rubber strips are arranged on the open mortise and tenon structure to ensure that the water in the drainage ditch does not leak into the lower slope body.

[0018] Preferably, the matrix soil is filled horizontally on the surface, and the water-repellent agent modified soil is filled in an arc-shaped arch top, which is beneficial to the rapid concentration of rainwater into the drainage ditch.

[0019] Further, the matrix soil is modified dredged soil, 5-7 g of high molecular water-absorbing resin, 0.4-0.6 g of polyacrylamide, and 30-40 g of straw are added to every 1 kg of the dredged soil; the water-repellent agent added to the water-repellent agent modified soil is selected from octadecyl primary amine, and the addition amount is 0.7%-0.9% of the total mass of the water-repellent agent modified soil.

[0020] Further, the thickness of the matrix soil is 20-30 cm, and the thickness of the water-repellent agent modified soil is 15-20 cm.

[0021] Further, the high molecular water-absorbing resin is preferably a potassium salt type high molecular water-absorbing resin (SAP).

[0022] The road slope anti-landslide supporting method with safety and ecological environmental protection has the following beneficial effects after adopting the above technical scheme:

[0023] (1) The method of the present application adopts tall fescue to repair the vegetation around the slope, and the root system of tall fescue is mainly located in the matrix soil, and the preferred matrix soil ratio can ensure that the tall fescue grows vigorously and has a developed root system. The bottom of the supporting frame is in a grid type, and the root system of tall fescue can penetrate into the slope to strengthen the reinforcement effect of the vegetation root system. The part of tall fescue growing out of the water-repellent agent modified soil can not only beautify the supporting structure, but also avoid the direct impact of rain on the soil.

[0024] (2) The method of the present application fills the water-repellent agent modified soil in an arc-shaped arch top, which is beneficial to the rapid sliding of rainwater to the two side drainage ditches, and avoids the slope sliding damage caused by the increase of soil bulk density and the decrease of shear strength due to rainwater infiltration in a short time.

[0025] (3) The top of the locally grouting anti-slide pile forms a structure similar to a multi-stage anti-slide pile under the connection effect of the anti-scour structure. At the same time, due to the redistribution of stress in the soil behind the pile, the shear strength of the soil plays a role, resulting in a soil arch effect, and the anti-slide force of the soil is significantly increased.

[0026] (4) In addition, the grouting section of the local grouting anti-slide pile is located on the potential sliding surface of the slope. Local grouting increases the shear strength of the sliding surface, making it difficult for the sliding surface to form and improving the stability of the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a road slope anti-landslide support method that takes both safety and ecological protection into consideration in the present invention;

[0028] Figure 2 is a cross-sectional view of the method of the present invention;

[0029] Figure 3 Schematic diagram of the bottom mesh grid 241 of the anti-scour structure used in the method of the present invention;

[0030] Figure 4 This is a schematic diagram of the open tenon structure used in the method of the present invention;

[0031] Figure 5 Layout diagram of the relationship between the local grouting anti-slide piles designed for the method of the present invention and the sliding surface and the following structure.

[0032] The accompanying drawings are marked as follows: 1-slip surface; 2-anti-scour structure; 21-matrix soil; 22-water repellent modified soil; 23-vegetation; 24-support frame; 3-local grouting anti-slip piles; 31-rigid piles; 32-bulk piles; 241-grid; 4-drainage channel; 5-open mortise and tenon structure; 51-upper open mortise and tenon structure; 52-lower open mortise and tenon structure; 53-sealing strip. DETAILED DESCRIPTION

[0033] To further illustrate the present invention, a roadside slope anti-landslide support method that balances safety and environmental protection is described in more detail below, with reference to the accompanying drawings. Obviously, the embodiments described herein represent only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments herein without inventive effort are considered within the scope of protection of the present invention.

[0034] Depend on Figure 1 The overall structural diagram of the road slope anti-landslide support method of the present invention is shown in FIG. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As can be seen, the prefabricated road slope support structure designed for a road slope anti-landslide support method that balances safety and environmental protection includes an anti-scour structure 2, locally grouting anti-slide piles 3, and a drainage channel 4. The support frame 24 of the anti-scour structure 2 is a rectangular container with an open top and a mesh grid 241 at the bottom, allowing plant roots to extend and take root in the slope soil. The interior of the anti-scour structure 2 is filled from bottom to top with matrix soil 21 and water-repellent modified soil 22. The roots of vegetation 23 are located in the matrix soil 21, and the tops of the vegetation 23 extend beyond the water-repellent modified soil 22. The surface of the matrix soil 21 is laid horizontally, while the surface of the water-repellent modified soil 22 is laid in an arc-shaped vault. The locally grouting anti-slide piles 3 are arranged in a plum blossom pattern on the slope surface. The upper ends of the locally grouting anti-slide piles 3 are connected to the bottom of the support frame 24 of the anti-scour structure 2, and the lower portions of the locally grouting anti-slide piles 3 extend through the potential slip surface 1 of the slope. The drainage channel 4 is arranged obliquely along the slope from top to bottom and is connected to the anti-scour structure 2 via an open mortise and tenon structure 5. The open mortise and tenon structure 5 consists of two parts: an upper open mortise and tenon structure 51 and a lower open mortise and tenon structure 52. The upper open mortise and tenon structure 51 forms the outer wall of the drainage channel 4, while the lower open mortise and tenon structure 52 forms the outer wall of the anti-scour structure 2. The mortise and tenon parts of the upper and lower open mortise and tenon structures 51 and 52 can fit together and be fixed together. Multiple sealing strips 53 are arranged on the open mortise and tenon structure 5.

[0035] Depend on Figure 1 It can be seen from the overall structural diagram of a road slope anti-landslide support method of the present invention that takes both safety and ecological protection into consideration that the local grouting anti-slip piles 3 are composed of a combination of rigid piles 31 and bulk piles 32. The rigid piles 31 are as long as the local grouting anti-slip piles 3. The bulk piles 32 are located in the lower grouting section of the rigid piles 31 and surround the lower part of the rigid piles 31. The lower part of the bulk piles 32 also passes through the potential sliding surface 1 of the slope. The bulk piles 32 are formed when cement mortar is squeezed into the soil on the side of the piles during grouting. Their stiffness and strength are lower than those of the rigid piles 31 but greater than those of the soil. The bulk piles 32 and the corresponding rigid piles 31 both pass through the potential sliding surface 1, which enhances the shear strength of the sliding surface, makes it difficult for a sliding fracture surface to form, and thus enhances the stability of the slope.

[0036] The safety and ecological environmental protection considered road slope landslide prevention supporting method has the following advantages: the matrix soil 21 is modified dredged soil, 6 g of high molecular water-absorbing resin-potassium salt type high molecular water-absorbing resin (SAP), 0.5 g of polyacrylamide and 35 g of straw are added to every 1 kg of the dredged soil, and the matrix soil 21 can greatly improve the germination rate and survival rate of the vegetation 23. The water repellent agent is selected as octadecyl primary amine, and the preferred content is 1%. The water repellent agent modified soil 22 greatly prolongs the time of rainwater infiltration into the soil body, and when the rainwater falls, the water droplets on the surface of the water repellent agent modified soil 22 are full lotus-shaped. The filling surface of the matrix soil 21 is an arc-shaped vault, which is convenient for the rapid sliding of rainwater and the discharge of the rainwater after the drainage ditch 4. After the vegetation 23 has a vigorous growth in the matrix soil 21, the water repellent agent modified soil 22 is paved, and the vegetation 23 is ensured to be higher than the water repellent agent modified soil 22. The vegetation 23 is preferably tall fescue which has strong growth ability, developed root system, high temperature resistance and strong stress resistance. Under the condition of rainfall, the tall fescue can reduce the impact load of rainwater on the soil body, and the developed root system can produce a reinforcing effect in the slope body and improve the shear strength of the soil body.

[0037] As shown in the open mortise structure schematic view of the application, Figure 4 It can be seen that the connection between the scouring resistance structure 2 and the drainage ditch 4 is through the open mortise structure 5, wherein the scouring resistance structure 2 is lower convex, and the drainage ditch 4 is upper convex. A plurality of sealing rubber strips 51 are arranged on the open mortise structure 5 to prevent the decrease of structural stability caused by rainwater infiltration.

[0038] As shown in the partial pressure grouting anti-slide pile and the sliding surface and the partial structure relationship arrangement view of the application method design, Figure 5 The depth H of the partial pressure grouting anti-slide pile 3 below the sliding surface 1 should not be less than the critical value H0, and H0 is calculated according to the following formula:

[0039] H0=d*tan alpha;

[0040] Wherein: d is the radius of the granular pile 32; alpha is the included angle between the tangent of the sliding surface 1 at the intersection of the rigid pile 31 and the sliding surface 1 and the horizontal direction.

[0041] Although the embodiments of the application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A road slope anti-landslide support method that takes both safety and ecological protection into consideration, characterized in that The following technical solutions are adopted: The road slope prefabricated support structure adopted in the design includes an anti-scour structure (2), a local grouting anti-slide pile (3) and a drainage channel (4); the support frame (24) of the anti-scour structure (2) is a rectangular container with an open top and a mesh grid (241) at the bottom. The interior of the anti-scour structure (2) is filled with matrix soil (21) and water-repellent modified soil (22) from bottom to top. The root system of the vegetation (23) is located in the matrix soil (21), and the top of the vegetation (23) exceeds the water-repellent modified soil (22); the upper end of the local grouting anti-slide pile (3) is connected to the bottom of the support frame (24) of the anti-scour structure (2), and the local grouting anti-slide pile (3) is connected to the bottom of the support frame (24) of the anti-scour structure (2). The lower part passes through the potential sliding surface (1) of the slope body; the local grouting anti-slip pile (3) is composed of a rigid pile (31) and a bulk pile (32), the rigid pile (31) is as long as the local grouting anti-slip pile (3), the bulk pile (32) is located in the lower grouting section of the rigid pile (31) and surrounds the lower part of the rigid pile (31), and the lower part of the bulk pile (32) passes through the potential sliding surface (1) of the slope body; the drainage channel (4) is arranged obliquely along the slope surface from top to bottom and is connected to the anti-scour structure (2) through an open mortise and tenon structure (5); a flood interception ditch is also provided at the upper gentle part of the road slope, and the water outlet of the flood interception ditch is connected to the upper water inlet of the drainage channel (4); The vegetation (23) is selected from tall fescue with strong growth ability, developed root system, high temperature resistance and strong stress resistance; the matrix soil (21) is selected from modified dredged soil, and 4-10 g of high molecular water-absorbing resin, 0.4-0.7 g of polyacrylamide and 30-50 g of straw are added to every 1 kg of dredged soil; the water repellent added to the water repellent modified soil is selected from octadecyl primary amine, and the addition amount is 0.6%-1.0% of the total mass of the water repellent modified soil (22); the thickness of the matrix soil (21) is 15-30 cm, and the thickness of the water repellent modified soil (22) is 10-20 cm; The depth H of the local grouting anti-slide pile (3) below the sliding surface (1) should not be less than a critical value H0, which is calculated according to the following formula: H0=d*tanα; Wherein: d is the radius of the bulk pile (32); α is the angle between the tangent of the sliding surface (1) and the horizontal direction at the intersection of the rigid pile (31) and the sliding surface (1).

2. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 1, characterized in that: The open mortise and tenon structure (5) is composed of two parts, namely an upper open mortise and tenon structure (51) and a lower open mortise and tenon structure (52); wherein the upper open mortise and tenon structure (51) is the outer wall of the drainage channel (4), and the lower open mortise and tenon structure (52) is the outer wall of the anti-scour structure (2), and the mortise and tenon parts of the upper open mortise and tenon structure (51) and the lower open mortise and tenon structure (52) can fit together and be fixed by clamping.

3. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 1, characterized in that: The volume of the bulk pile (32) located below the slip surface (1) accounts for 40% to 70% of the overall volume of the bulk pile.

4. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 1, 2 or 3, characterized in that: The local grouting anti-slide piles (3) are arranged in a plum blossom shape on the slope surface.

5. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 4, characterized in that: A plurality of sealing strips (53) are arranged on the open tenon structure (5).

6. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 5, characterized in that: The surface of the matrix soil (21) is filled horizontally, and the surface of the water repellent modified soil (22) is filled in the form of an arc-shaped vault.

7. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 2, characterized in that: The volume of the bulk pile (32) located below the sliding surface (1) accounts for 40%-70% of the overall volume of the bulk pile; the local grouting anti-sliding piles (3) are arranged in a plum blossom shape on the slope surface; multiple sealing strips (53) are arranged on the open tenon structure (5); the surface of the matrix soil (21) is filled horizontally, and the surface of the water repellent modified soil (22) is filled in the form of an arc-shaped vault.

8. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 7, characterized in that: The matrix soil (21) is modified dredged soil, and 5-7 g of polymer water-absorbing resin, 0.4-0.6 g of polyacrylamide, and 30-40 g of straw are added to every 1 kg of dredged soil; the water-repellent added to the water-repellent modified soil is octadecyl primary amine, and the addition amount is 0.7%-0.9% of the total mass of the water-repellent modified soil (22); the polymer water-absorbing resin is a potassium salt type polymer water-absorbing resin.

9. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 8, characterized in that: The thickness of the matrix soil (21) is 20-30 cm, and the thickness of the water repellent modified soil (22) is 15-20 cm.

10. A road slope anti-landslide support method that takes both safety and ecological protection into consideration according to claim 9, characterized in that: The matrix soil (21) is modified dredged soil, and 6 g of high molecular weight water-absorbing resin, 0.5 g of polyacrylamide, and 35 g of straw are added to every 1 kg of dredged soil; the water repellent added to the water repellent modified soil is octadecyl primary amine, and the addition amount is 0.8% of the total mass of the water repellent modified soil (22).

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