Shallow anti-scour and deep anti-slip support device and method for granite residual soil slope

Abstract

The present invention discloses a shallow anti-scour and deep anti-slip support device for a granite residual soil slope, comprising a lattice beam reinforcement structure provided on the slope surface, a jet-jet anchor cable anchored within the slope and fixedly connected to the lattice beam reinforcement structure, FRP bars sleeved within the jet-jet anchor cable and fixedly connected to the lattice beam reinforcement structure, and a MICP bacterial solution and nutrient solution injected into the granite residual soil of the slope via the jet-jet anchor cable. The present invention also discloses a support method. The present invention utilizes a jet-jet anchor cable to perform MICP treatment on the granite residual soil slope, greatly facilitating the uniform infiltration of the MICP bacterial solution and nutrient solution into the surrounding granite residual soil, thereby improving the strength of the surrounding soil. Furthermore, by sleeve-jetting the FRP bars within the jet-jet anchor cable and anchoring the two together, a high-resistance and long-life anchor cable is formed, exhibiting improved anchoring and anti-slip performance, thereby increasing the anchoring force required for deep sliding of the anchor cable.

Description

Technical Field

[0001] The invention relates to a shallow anti-scour and deep anti-slip support device for a granite residual soil slope and a method thereof. Background Art

[0002] Granite residual soils are widely distributed east of the Yunnan-Guizhou Plateau, along the Qinling-Dabie Mountains, and throughout southeastern my country. They are particularly concentrated in Guangdong, southeastern Guangxi, southwestern Yunnan, Fujian, southern Hunan, and southern Jiangxi. They are typical regionally specific soils. As natural slopes, granite residual soils are highly susceptible to landslides and slope instability, necessitating reinforcement of these slopes.

[0003] Common slope reinforcement methods include using curing agents such as cement and lime to generate a cementing gel in granite residual soil to improve the overall strength of the granite residual soil, or using a combination of lattice beams and anchor cables on the slope. However, the strength increased by these methods is difficult to meet the requirements for anti-instability, and the use of various curing agents will cause significant pollution to the atmosphere, soil and groundwater, and damage the ecology around the granite residual soil slope. Summary of the Invention

[0004] The present invention aims to address the aforementioned issues by providing a high-strength, long-life, and environmentally friendly shallow-layer anti-scour and deep-layer anti-slip support device and method for granite residual soil slopes. This device utilizes a structure connecting jet-jet anchor cables and FRP bars, significantly enhancing the anchoring force of the cables and preventing slippage deep within the granite residual soil slope. Furthermore, the jet-jet anchor cables perform MICP (Micro Injection Molding) consolidation deep within the granite residual soil slope, significantly enhancing the slope's pullout resistance.

[0005] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] A shallow anti-scour and deep anti-slip support device for a granite residual soil slope comprises a lattice beam reinforcement structure provided on the slope surface and used to reinforce the granite residual soil of the slope, a jet-jet anchor cable anchored in the slope and fixedly connected to the lattice beam reinforcement structure, FRP bars sleeved within the jet-jet anchor cable and fixedly connected to the lattice beam reinforcement structure, and MICP bacterial solution and nutrient solution injected into the granite residual soil of the slope via the jet-jet anchor cable.

[0007] As a preferred solution, the jet-jet anchor cable includes an inner tube and an outer tube sleeved outside the inner tube. The outer tube is evenly provided with liquid outlets. The MICP bacterial solution and nutrient solution are sequentially injected into the granite residual soil of the slope through the cavity between the inner tube and the outer tube and the liquid outlets. The FRP reinforcement is arranged in the inner tube.

[0008] As a preferred solution, the lattice beam reinforcement structure includes lattice beams and lattice columns, the lattice beams and lattice columns are cross-fixedly connected, and the jet-sprayed anchor cables and FRP bars are both fixedly connected to the intersections of the lattice beams and lattice columns.

[0009] As a preferred solution, plants are planted on the surface of the granite residual soil of the slope.

[0010] As a preferred solution, the outer tube and the inner tube are made of steel.

[0011] As a preferred solution, the lattice beams and lattice columns are both made of steel bars and concrete.

[0012] A supporting method for a shallow anti-scour and deep anti-slip supporting device for a granite residual soil slope comprises the following steps:

[0013] S1. Construction of lattice beam reinforcement structure on the granite residual soil of the slope and positioning of anchor holes;

[0014] S2. Drill according to the anchor hole position and follow the jet-jet anchor cable with the drill bit to the specified depth;

[0015] S3. Sleeve the FRP reinforcement onto the jet-grouting anchor cable and adjust the anchor cable stress by pre-tensioning and repeated tensioning.

[0016] S4. Grouting is performed into the inner tube to securely connect the FRP bars to the inner tube. At the same time, a certain amount of MICP bacterial solution and nutrient solution is poured into the cavity between the inner tube and the outer tube, so that the MICP bacterial solution and nutrient solution are poured into the granite residual soil of the slope through the liquid outlet.

[0017] S5. After curing to the specified age, the jet-grouting anchor cables and FRP bars are tensioned and locked to seal the anchors;

[0018] S6. Spray a certain amount of bacterial solution and nutrient solution on the surface of the granite residual soil, and evenly sow grass seeds.

[0019] The implementation of the present invention has the following beneficial effects:

[0020] 1. The present invention uses a jet-jet anchor cable to perform MICP treatment on the granite residual soil slope, which greatly facilitates the uniform infiltration of the MICP bacterial solution and nutrient solution into the surrounding granite residual soil, can better improve the strength of the surrounding soil, and solidify the deep granite residual soil. In addition, by sleeved FRP bars inside the jet-jet anchor cable and anchoring the two together, a high-resistance anchor cable is formed, which has better anchoring and anti-slip performance, and improves the anchoring force required for the anchor cable to slide in the deep layer.

[0021] 2. Since the FRP bars of the present invention are stronger than conventional bars, and have the characteristics of light material and good corrosion resistance, the pull-out resistance provided by the granite residual soil solidified by MICP can meet the anchoring force required for deep sliding of the anchor cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of a shallow anti-scour and deep anti-slip support device for a granite residual soil slope according to the present invention.

[0024] Figure 2 yes Figure 1 A top view perpendicular to the slope surface.

[0025] Figure 3 The present invention is a schematic structural diagram of a rotary jet anchor cable of a shallow anti-scour and deep anti-slip support device for a granite residual soil slope. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example

[0028] Reference Figures 1 to 3 This embodiment relates to a shallow anti-scour and deep anti-slip support device for a granite residual soil slope. The device comprises a lattice beam reinforcement structure 1 disposed on the slope surface and used to reinforce the granite residual soil of the slope 10; a jet-jet anchor cable 2 anchored within the slope 10 and fixedly connected to the lattice beam reinforcement structure 1; and FRP rebars 3 sleeved within the jet-jet anchor cable 2 and fixedly connected to the lattice beam reinforcement structure 1. Furthermore, a MICP bacterial solution and a nutrient solution are injected into the granite residual soil of the slope 10 via the jet-jet anchor cable 2. The bacterial solution is a culture of Sporosarcina pasteurii, and the nutrient solution mainly comprises yeast extract, ammonium sulfate, and sodium hydroxide.

[0029] MICP stands for microbial induced calcium carbonate deposition, a common bio-induced mineralization process. It utilizes certain bacteria in nature, whose metabolism produces urease, which breaks down urea. The carbonate ions produced by urea decomposition combine with naturally occurring free metal cations to form gelled crystals. MICP treatment of granite residual soil exhibits enhanced solidification properties.

[0030] This structure uses a jet-jet anchor cable 2 to perform MICP treatment on the granite residual soil slope 10, greatly facilitating the uniform infiltration of the MICP bacterial solution and nutrient solution into the surrounding granite residual soil, thereby improving the surrounding soil strength and solidifying the deep granite residual soil. Furthermore, by inserting the FRP bars 3 within the jet-jet anchor cable 2 and anchoring the two together, a high-resistance anchor cable is formed, which has better anchoring and anti-slip properties, thereby increasing the anchoring force required for deep-layer sliding. Furthermore, because the FRP bars 3 are stronger than conventional bars, and are lightweight and corrosion-resistant, the pullout resistance provided by the MICP-cured granite residual soil can meet the anchoring force required for deep-layer sliding.

[0031] like Figure 3 As shown, the jet-grouting anchor cable 2 comprises an inner tube 21 and an outer tube 22 sheathed around the inner tube 21. Liquid outlets 221 are uniformly distributed on the outer tube 22. The MICP bacterial solution and nutrient solution are sequentially injected into the granite residual soil of the slope 10 through the cavity 222 between the inner and outer tubes 21 and the liquid outlets 221. The FRP rebar 3 is located within the inner tube 21. The outer tube 22 serves as a nozzle. When drilling an anchor hole in the slope 10, the outer tube 22 and the inner tube 21 (prefabricated shotcrete steel pipe) follow the drill bit to the designated depth. After the drill bit is withdrawn, the FRP bar 3 is sleeved inside the inner tube 21. Then, a pressure device is used to inject grout into the inner tube 21 to fix the FRP bar 3 to the inner tube 21. At the same time, a certain amount of MICP bacterial solution and nutrient solution are injected into the cavity between the inner tube 21 and the outer tube 22. The MICP bacterial solution and nutrient solution are then injected into the granite residual soil of the slope 10 through the liquid outlet 221 to improve the vegetation and strength of the granite residual soil.

[0032] The lattice beam reinforcement structure 1 includes lattice beams 11 and lattice columns 12. The lattice beams 11 and lattice columns 12 are cross-fixed and connected to form evenly distributed lattices 112 for planting. The jet-sprayed anchor cables 2 and FRP bars 3 are both fixedly connected to the intersections of the lattice beams 11 and lattice columns 12. The jet-sprayed anchor cables 2 and FRP bars 3 anchor the lattice beams 11 and lattice columns 12, allowing them to be more stably fixed to the slope 10.

[0033] Plants 4 are planted on the surface of the granite residual soil of the slope 10. The plants 4 are planted within the grids 112. Vegetation is preferred. The MICP-treated granite residual soil has vegetative properties, allowing for the growth of grass. Planting vegetation on the granite residual soil slope significantly enhances the soil's resistance to erosion.

[0034] The outer tube 22 and the inner tube 21 are made of steel. The lattice beams and lattice columns are both made of steel bars and concrete.

[0035] This embodiment also provides a method for supporting a shallow anti-scour and deep anti-slip support device for a granite residual soil slope 10, comprising the following steps:

[0036] S1. Constructing the lattice beam reinforcement structure 1 on the granite residual soil of the slope 10 and positioning the anchor holes;

[0037] S2, drill according to the anchor hole position, and follow the jet-jet anchor cable 2 with the drill bit to the specified depth;

[0038] S3, sleeve the FRP reinforcement 3 on the rotary grouting anchor cable 2, and adjust the anchor cable stress by pre-tensioning and repeated tensioning;

[0039] S4, grouting is performed into the inner tube 21 to securely connect the FRP bars 3 to the inner tube 21, and at the same time, a certain amount of MICP bacterial solution and nutrient solution is poured into the cavity between the inner tube 21 and the outer tube 22, so that the MICP bacterial solution and nutrient solution are poured into the granite residual soil of the slope 10 through the liquid outlet 221.

[0040] S5. After curing to the specified age, the jet-grouting anchor cable 2 and the FRP reinforcement 3 are tensioned and locked to seal the anchor;

[0041] S6. Spray a certain amount of bacterial solution and nutrient solution on the surface of the granite residual soil, and evenly sow grass seeds.

[0042] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A shallow anti-scour and deep anti-slip support device for granite residual soil slope, characterized in that: The invention comprises a lattice beam reinforcement structure provided on the surface of the slope and used to reinforce the granite residual soil of the slope, a jet-jet anchor cable anchored in the slope and fixedly connected to the lattice beam reinforcement structure, FRP bars sleeved in the jet-jet anchor cable and fixedly connected to the lattice beam reinforcement structure, and MICP bacterial solution and nutrient solution are injected into the granite residual soil of the slope through the jet-jet anchor cable; The jet-jet anchor cable includes an inner tube and an outer tube sleeved outside the inner tube. The outer tube is evenly provided with liquid outlets. The MICP bacterial solution and nutrient solution are sequentially injected into the granite residual soil of the slope through the cavity between the inner and outer tubes and the liquid outlets. The FRP reinforcement is arranged in the inner tube. The FRP reinforcement is sleeved in the jet-jet anchor cable and the two are anchored together to form a high-resistance anchor cable. Grouting is then injected into the inner tube to fix the FRP reinforcement to the inner tube.

2. The shallow anti-scour and deep anti-slip support device for granite residual soil slope according to claim 1 is characterized in that: The lattice beam reinforcement structure comprises lattice beams and lattice columns, the lattice beams and lattice columns are cross-fixedly connected, and the jet-sprayed anchor cables and FRP bars are both fixedly connected to the intersections of the lattice beams and the lattice columns.

3. The shallow anti-scour and deep anti-slip support device for granite residual soil slope according to claim 1 is characterized in that: Plants are planted on the surface of the granite residual soil of the slope.

4. The shallow anti-scour and deep anti-slip support device for granite residual soil slope according to claim 1 is characterized in that: The outer tube and the inner tube are made of steel.

5. The shallow anti-scour and deep anti-slip support device for granite residual soil slope according to claim 2, characterized in that: The lattice beams and lattice columns are both made of steel bars and concrete.

6. A support method for a granite residual soil slope using a shallow anti-scour and deep anti-slip support device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Construct the lattice beam reinforcement structure on the granite residual soil of the slope and locate the anchor holes; S2. Drill according to the anchor hole position and follow the jet-jet anchor cable with the drill bit to the specified depth; S3. Sleeve the FRP reinforcement onto the jet-grouting anchor cable and adjust the anchor cable stress by pre-tensioning and repeated tensioning. S4. Grouting is performed into the inner tube to securely connect the FRP bars to the inner tube. At the same time, a certain amount of MICP bacterial solution and nutrient solution is poured into the cavity between the inner tube and the outer tube, so that the MICP bacterial solution and nutrient solution are poured into the granite residual soil of the slope through the liquid outlet. S5. After curing to the specified age, the jet-grouting anchor cables and FRP bars are tensioned and locked to seal the anchors; S6. Spray a certain amount of bacterial solution and nutrient solution on the surface of the granite residual soil, and evenly sow grass seeds.

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