A wedge-shaped rock slope targeted reinforcement method for point cloud modeling and space calculation

Abstract

This invention relates to a method for targeted reinforcement of wedge-shaped rock slopes using point cloud modeling and spatial calculation, belonging to the field of geotechnical engineering technology. The method includes: acquiring point cloud data of the rock slope using UAV close-range photogrammetry combined with image processing software; generating a solid model based on the rock slope point cloud data and dividing it into a gridded rock slope model; performing fault cutting and specific spatial calculations based on the gridded rock slope model to identify anchor points requiring targeted reinforcement; optimizing the anchor structure and completing the anchoring system construction; and constructing a weathering-resistant composite surface layer: first laying a metal mesh, then implementing slope waterproofing treatment, followed by a sprayed concrete layer. This invention uses a numerical simulation positioning method to accurately obtain the anchor coordinates at the fault location, thereby obtaining the spatial distance between each anchor point and the fault plane, identifying the anchor points requiring targeted reinforcement, and performing precise targeted reinforcement. This invention features accurate positioning, reliable structure, and wide engineering adaptability.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering technology, and in particular relates to a method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation. Background Technology

[0002] Wedge-shaped landslides on rock slopes are a highly dangerous type of geological hazard in mountainous infrastructure construction. Their sudden onset and wide-ranging destructive impact often pose a serious threat to engineering safety. Because faults extend in three-dimensional space, calculating the distance from each anchor point to the fault is extremely complex and labor-intensive, making it difficult to accurately and quickly determine the depth of each anchor bolt to the fault, thus becoming a key factor affecting the stability control of the wedge-shaped landslide. Traditional slope reinforcement techniques often lack geological data support for structural parameter design. Commonly used anchoring systems often employ uniformly distributed anchor bolts with the same parameters, which is ill-suited to the complex mechanical relationship between the wedge-shaped rock mass and the fault structure. This results in insufficient matching between the anchoring structure and geological characteristics, leading to inadequate wedge anchoring and preventing precise targeted reinforcement. This is a significant factor in triggering wedge-shaped landslides and other geological hazards, seriously threatening the production and daily life of the project, and even causing loss of life and property. Furthermore, the water-air coupling effect significantly degrades the strength of easily weathered rock masses, severely impacting slope stability.

[0003] However, existing methods for reinforcing easily weathered wedge-shaped slopes have many limitations, such as the complexity and inefficiency of calculating the fault depth at anchor points, the inability to achieve targeted reinforcement of weak structural surfaces due to the simple design of anchor bolts, the inability to consider the actual shape characteristics of the slope, insufficient slope protection durability, and poor weathering resistance. These systemic defects make it difficult for slope reinforcement structures to effectively suppress wedge deformation and slope weathering, significantly restricting the long-term stability of slope engineering.

[0004] For example, Chinese patent (publication number: CN106844927A, publication date: 20170613) discloses a method for determining the optimal parameters of anchorage in a rock mass slope with a double slip surface. This method includes using stereographic projection to determine the normal angle between the anchor rod and the structural surface. While this method can indirectly calculate the distance from the anchor point to the structural surface, it requires sequential calculation of all anchor rods in the anchorage system. Furthermore, it necessitates simplifying the slope into a regular geometric shape suitable for mathematical calculations, leading to significant deviations between the model and the actual geological characteristics of the engineering slope, thus limiting its applicability. In addition, the method requires individual calculation of all anchor rods in the anchorage system, involving complex spatial geometric operations, resulting in low computational efficiency and making it difficult to meet the rapid design requirements of large-scale slope engineering projects.

[0005] Chinese patent "A Method for Supporting High Slopes in Fragmented-Relatively Intact Rock Engineering" (Publication No.: CN118292468A, Publication Date: July 5, 2024) discloses a method for supporting high slopes in fragmented-relatively intact rock engineering. This method includes obtaining the strength of the structural surface and the rock mass using the strength reduction method, and determining the positions of the lattice anchor cables and reinforcing anchors. This method can improve slope stability to a certain extent, but it cannot accurately calculate the position of the structural surface. At the same time, it does not consider the spatial extension properties of the structural surface, and there is a problem of insufficient matching degree between the reinforcement system and the geological structure, which makes it impossible to achieve precise targeted reinforcement.

[0006] Chinese patent for an ecological protection device for slopes with easily weathered rock (publication number: CN222594892U, publication date: March 11, 2025) discloses an ecological protection device for slopes with easily weathered rock. The protective layer adopts an open ecological structure, which fails to form a closed airtight isolation layer. Oxygen and water vapor in the atmosphere can still interact with the rock mass through the pores, resulting in incomplete weathering inhibition. The protective layer material adopts a conventional ecological concrete structure, which is prone to crack expansion under wet-dry cycles and freeze-thaw action, resulting in insufficient durability and making it difficult to meet the long-term protection needs in harsh environments such as high altitude and cold regions.

[0007] Therefore, in view of the shortcomings of existing technologies such as low efficiency in calculating the fault depth of anchor points, insufficient matching degree between anchor structural parameters and geological features, and poor weathering resistance and durability of slope protection structures, this invention proposes a targeted reinforcement method for wedge-shaped rock slopes based on point cloud modeling and spatial calculation. This method is of great significance for the safe and stable development, cost reduction and efficiency improvement, and sustainable safe and stable development of the field of slope reinforcement technology in geotechnical engineering. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a targeted reinforcement method for wedge-shaped rock slopes based on point cloud modeling and spatial calculation. This method is used for the support of easily weathered wedge-shaped rock slopes. By establishing a three-dimensional geological model, the coordinates of the anchor bolts at fault locations are accurately obtained. A segmented anchoring system is used to match the mechanical characteristics of the structural surface, and a composite protective layer is constructed to enhance the weathering resistance and significantly improve the long-term stability of the slope engineering.

[0009] A method for targeted reinforcement of wedge-shaped rock slopes using point cloud modeling and spatial computation includes the following steps:

[0010] Acquire point cloud data of rock slopes;

[0011] A solid model is generated and gridded based on point cloud data of rock slope to obtain a gridded rock slope model.

[0012] Based on the gridded rock slope model, fault cutting and spatial calculations are performed to obtain the anchor coordinates of the fault location and calculate the spatial distance between each anchor node and the fault plane, thus identifying the anchor points that need targeted reinforcement.

[0013] For anchor points that require targeted reinforcement, optimize the anchor bolt structure and complete the anchoring system construction;

[0014] Construct a weather-resistant composite surface layer.

[0015] The method for obtaining point cloud data of rock slopes is as follows:

[0016] By using UAV close-range photogrammetry technology to acquire image data of rock slopes at multiple heights and angles, and then using image processing software to process the image data, three-dimensional point cloud data containing the actual characteristics of the rock slopes are generated.

[0017] The drone's forward overlap is greater than 70%, and its lateral overlap is greater than 60%.

[0018] The process of image processing software in processing image data includes image alignment, distortion correction, and 3D reconstruction.

[0019] When generating a solid model and dividing it into grids based on point cloud data of rock slopes, a grid dividing tool is used to perform non-uniform gridding on the solid model.

[0020] The specific method for fault cutting and spatial calculation based on the gridded rock slope model is as follows:

[0021] The gridded rock slope model was imported into numerical analysis software. Anchor point coordinates, anchor angles, and fault attitude parameters were added via parametric command flow. After numbering the anchors, they were cut along the fault plane. After retaining the wedge shape, the anchor coordinates at the fault location were determined based on the anchor point coordinates, anchor angles, anchor lengths, and fault attitude information. The spatial distance between each anchor node and the fault plane was calculated based on the anchor point coordinates and the anchor coordinates at the fault location. In the calculation results, anchor points with a spatial distance greater than 0 from the fault plane were identified as those requiring targeted reinforcement.

[0022] The specific optimization method for the anchor bolt structure is to adopt a segmented anchor bolt structure. The segmented anchor bolt structure includes the anchor bolt and internal reinforcement, with the anchorage angle remaining the same as the original anchor bolt design. The total length of the internal reinforcement is the same as the original anchor bolt design length, including a standard section and a reinforced section. The section closest to the fault is the reinforced section, with a diameter 1.5 times that of the standard section. The length h of the reinforced section is dynamically adjusted based on the rock mass integrity coefficient at the site. Specifically, it is determined based on the rock mass quality indicators shown in the engineering geological survey data, as follows:

[0023] When the rock mass quality index is ≤25%: h=0.4H, the center of the reinforced section is located at the fault;

[0024] When 25% < rock mass quality index ≤ 50%, h = 0.3H, and the center of the reinforced section is located at the fault.

[0025] When the rock mass quality index is >50%, h=0.2H, and the center of the reinforced section is located at the fault.

[0026] Where h is the length of the reinforced section and H is the total length of the internal reinforcement of the anchor rod.

[0027] When constructing the weather-resistant composite surface layer, first lay an anti-corrosion metal mesh and implement slope waterproofing treatment; then use adjustable connectors to keep the wire mesh 20mm~30mm away from the slope to form a stress buffer space; finally spray a layer of concrete to form a composite protective surface layer that isolates the atmosphere.

[0028] The anti-corrosion metal mesh laid is a galvanized steel wire mesh with a mesh size of 50mm×50mm and a wire diameter of ≥3mm;

[0029] The process of spraying concrete is to spray in layers: the first layer is a 10mm~20mm thick polymer waterproof mortar layer, and the second layer is a 60mm~80mm thick steel fiber concrete layer.

[0030] The fiber content in the steel fiber reinforced concrete layer is 35 kg / m³ to 45 kg / m³, and the fiber aspect ratio is 50 to 80.

[0031] By employing the above technical solution, the present invention has at least the following beneficial effects:

[0032] (1) This invention fully considers the actual characteristics of the slope surface and, based on high-precision three-dimensional modeling, accurately and quickly calculates the anchorage distance from each anchor point to the fault. This method is applicable to the anchorage distance between any anchor point and any fault, and the distance from the anchor point to the fault is of great significance for the design of anchor bolt parameters and precise targeted protection design.

[0033] (2) The present invention has precisely optimized the support structure, fully considered the rock mass quality index and fault location, adopted a segmented anchor structure, and increased the anchor diameter in the dangerous area in a targeted manner, which significantly improved the anchoring effect and achieved efficient targeted protection of the wedge-shaped slope.

[0034] (3) This invention combines the characteristics of easily weathered rocks and adopts a composite protective surface layer, which effectively prevents the water-air coupling effect from deteriorating the strength of easily weathered rock mass, effectively inhibits the deformation of wedge-shaped bodies and the weathering and deterioration process of slopes, and helps to realize the formation of a three-dimensional protection system for easily weathered wedge-shaped slopes.

[0035] (4) This invention is applicable to wedge-shaped slopes with any number of faults, and is a supplement and improvement to the existing rock slope support system and methods, with a wide range of applications.

[0036] This application addresses the challenge of accurately determining the spatial location of faults in rock slopes by proposing a numerical simulation-based positioning method. This method enables accurate identification of fault location information and precise acquisition of anchor coordinates at the fault location. Based on the anchor coordinates and the anchor coordinates at the fault location, the spatial distance between each anchor point and the fault plane can be calculated. Using the calculation results, combined with a segmented anchor reinforcement structure, precise targeted reinforcement of the fault can be implemented, significantly improving the overall stability of the slope.

[0037] This invention effectively solves the technical problems in the prevention and control of wedge-shaped landslides, such as low efficiency in calculating fault depth at anchor points, insufficient matching degree between anchor structural parameters and geological characteristics, and poor weathering resistance and durability of slope protection structures. It features accurate positioning, reliable structure, and wide engineering adaptability. Attached Figure Description

[0038] Figure 1 A flowchart of a method for targeted reinforcement of wedge-shaped rock slopes using point cloud modeling and spatial computation provided by the present invention;

[0039] Figure 2 This is a three-dimensional point cloud data map of the slope surface generated in an embodiment of the present invention;

[0040] Figure 3 The surface diagram generated when constructing a solid model of a slope for an embodiment of the present invention;

[0041] Figure 4 The solid model diagram generated when constructing the solid model of the slope for an embodiment of the present invention;

[0042] Figure 5 The gridded slope model diagram obtained when constructing the solid model of the slope for an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram illustrating the import of a gridded slope model into numerical analysis software during fault cutting and spatial calculation, as per an embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram illustrating the addition of parameters via parameterization commands during the fault cutting and spatial calculation process, as described in an embodiment of the present invention.

[0045] Figure 8 This is a schematic diagram of the cutting along the fault plane during the fault cutting and spatial calculation process according to an embodiment of the present invention;

[0046] Figure 9A schematic diagram of the construction effect at one of the faults in a point cloud modeling and spatial calculation method for targeted reinforcement of wedge-shaped rock slopes provided in an embodiment of the present invention;

[0047] Figure 10 for Figure 9 Enlarged schematic diagram of section B in the middle;

[0048] Figure 11 This is a cross-sectional view of a segmented anchor structure;

[0049] Figure 12 for Figure 9 Enlarged view of section A in the middle;

[0050] 1-Connector, 2-Segmented anchor structure, 3-Ordinary section, 4-Reinforced section, 5-Composite protective surface layer, 6-Steel fiber reinforced concrete layer, 7-Galvanized steel wire mesh, 8-Polymer waterproof mortar layer, 9-Rock slope, 10-Fault. Detailed Implementation

[0051] To better explain and facilitate understanding of the present invention, the technical solution and effects of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] This embodiment employs a point cloud modeling and spatial computation-based targeted reinforcement method for wedge-shaped rock slopes. It calculates and constructs a reinforcement system for a specific actual rock slope, with the parameters of the actual rock slope as follows:

[0053] Actual measurements revealed two faults on the rock slope, with dips of 146.927°∠39.9° and 208.564°∠55.29° respectively. The area within the rock slope is entirely sandstone, and its Mohr-Coulomb parameters are shown in Table 1.

[0054] Table 1. Mohr-Coulomb parameters of the rock in this embodiment of the rock slope:

[0055] ;

[0056] In this implementation, the original design parameters of the anchor bolts for the rock slope 9 were: anchorage angle 15°, anchor bolt length 20m, and anchorage point coordinates as shown in Table 2.

[0057] Table 2. Coordinates of anchorage points on the rock slope in this embodiment:

[0058] ;

[0059] Combination Figure 1 As shown, a method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial computation specifically includes the following steps:

[0060] Step 1: Obtain point cloud data for rock slopes:

[0061] Using UAV close-range photogrammetry technology, we acquired image data of the rock slope from more than nine heights and angles. The angles included a vertical overhead view (directly above), a horizontal angle directly in front of the slope (directly in front), a left-front angle relative to the slope centerline (45° to the left), and a right-front angle relative to the slope centerline (45° to the right). Then, we used image processing software to process the image data and generate three-dimensional point cloud data containing the actual characteristics of the rock slope.

[0062] In this embodiment, high-precision multi-height, multi-angle image data of the rock slope 9 are acquired using UAV close-range photogrammetry technology. The UAV is controlled to perform multi-angle photography with aerial photography parameters of forward overlap >70% and lateral overlap >60%, acquiring images at heights of 10m, 30m, and 60m respectively. Then, Photoscan image processing software is used for image processing, including image alignment, distortion correction, and 3D reconstruction, generating a 3D point cloud data map of the rock slope surface, as shown below. Figure 2 As shown, three-dimensional point cloud data of the rock slope surface were obtained.

[0063] Step 2: Generate solid model and mesh:

[0064] A solid model of a rock slope is constructed based on the three-dimensional point cloud data of the rock slope surface. A non-uniform meshing process is performed using a mesh generation tool to generate a mesh file.

[0065] like Figure 3 As shown in the figure, in this embodiment, the three-dimensional point cloud data of the rock slope surface is imported into Rhino software to generate a curved surface. Then, a solid model is built according to the actual dimensions of the rock slope. The generated solid model is as follows. Figure 4 As shown; based on the actual stratum thickness, stratigraphy is divided, and the NURBS function and GRIDDLE plugin are used to refine the mesh, resulting in a meshed rock slope model, as shown. Figure 5 As shown.

[0066] Step 3: Fault cutting and spatial calculation: Accurately obtain the anchor coordinates at the fault location and calculate the spatial distance between each anchor point and the fault plane to identify the anchor points that require targeted reinforcement.

[0067] The gridded rock slope model was imported into the numerical analysis software. Anchor point coordinates, anchor angles, anchor lengths, and fault attitude parameters were added through a parametric command flow. The anchors were numbered and cut along the fault plane, retaining the wedge shape. The anchor coordinates at the fault location were determined using the FISH language. The spatial distance between each anchor point and the fault plane was calculated based on the anchor point coordinates and the anchor coordinates at the fault location.

[0068] In this embodiment, the gridded rock slope model obtained in step 2 is imported into FLAC 3D software, such as... Figure 6 As shown; Set stratigraphic parameters: Use the FISH language to add the anchor point coordinates, anchor angle, anchor bolt length, and fault attitude information to the numerical model. The fault attitude information includes dip angle and fault location, such as... Figure 7 At the same time, the anchor bolts are numbered, and then cut along the fault plane, such as... Figure 8 As shown in Table 3, the wedge shape is preserved, and each anchor is traversed using the FISH language. The anchor number and anchor length are recorded. The anchor coordinates of the fault location are determined based on the anchor point coordinates, anchor angle, anchor length, and fault attitude information. The spatial distance between each anchor point and the fault plane is calculated based on the anchor point coordinates and the anchor coordinates of the fault location.

[0069] Table 3. Calculation results of the spatial distance between each anchorage point and the fault plane:

[0070] ;

[0071] Based on the calculation results of the spatial distance between the anchorage point and the fault plane, it is clear that anchorage points with a spatial distance greater than 0 from the fault plane are those that need targeted reinforcement.

[0072] Step 4: Optimize the anchor bolt structure for anchor points requiring targeted reinforcement and complete the anchoring system construction:

[0073] Based on the spatial distance between each anchor point and the fault plane obtained in step 3, a segmented anchor structure 2 is used for local reinforcement. The anchor angle of the segmented anchor is 15°, the same as the original anchor design. Specifically, it includes the anchor and internal reinforcement. The total length of the internal reinforcement is the same as the original anchor design length, including ordinary section 3 and reinforced section 4. The section closest to the fault is reinforced section 4. The diameter of the anchor is increased in the affected area of ​​the fault plane. The diameter of reinforced section 4 is 1.5 times the diameter of ordinary section 3. The length h of reinforced section 4 is dynamically adjusted according to the rock mass integrity coefficient on site. Specifically, it is determined according to the rock mass quality index (RQD) of the rock shown in the engineering geological survey data, as follows:

[0074] When the rock mass quality index is ≤25%: h=0.4H, the center of reinforced segment 4 is located at the fault;

[0075] When 25% < rock mass quality index ≤ 50%, h = 0.3H, and the center of reinforced segment 4 is located at the fault.

[0076] When the rock mass quality index is >50%, h=0.2H, and the center of reinforced segment 4 is located at the fault.

[0077] Where h is the length of the reinforced section 4, and H is the total length of the internal reinforcement of the anchor rod.

[0078] like Figures 9-11 As shown, in this embodiment, a segmented anchor structure 2 is adopted. The diameter of the ordinary section 3 with internal reinforcement of the segmented anchor is 22mm, therefore the diameter of the reinforcing bar in the reinforcing section 4 is 33mm. The total length H of the internal reinforcement of the segmented anchor is 20m. According to the engineering geological survey data, the rock mass quality index is 62.3% > 50%. Based on the above determination rules, the length h of the reinforcing section 4 in this embodiment is 0.2 × 20 = 4m, and the center of the reinforcing section 4 should be located at the fault.

[0079] Step 5: Construct a weather-resistant composite surface layer:

[0080] After the anchoring system is completed, anti-corrosion metal mesh is laid first, slope waterproofing is implemented, and finally a layer of sprayed concrete is applied to form a composite protective surface layer that isolates the atmosphere.

[0081] Combination Figure 12 As shown, in this embodiment, a galvanized steel wire mesh 7 with a mesh size of 50mm×50mm and a wire diameter of 4mm is first laid. Then, layered sprayed concrete is used to form a protective layer: the first layer is a 15mm thick polymer waterproof mortar layer 8 as the main waterproof layer; an adjustable connector 1 is used to maintain a 20mm gap between the galvanized steel wire mesh 7 and the slope surface, forming a stress buffer space. The second layer is a steel fiber reinforced concrete layer with an aspect ratio of 60 and a dosage of 45kg / m³, which is sprayed to form an 80mm thick steel fiber reinforced concrete layer 6. After 28 days of spraying, the compressive strength is not less than 30MPa, thereby achieving the goal of isolating air and preventing weathering.

[0082] The targeted reinforcement method for wedge-shaped rock slopes using point cloud modeling and spatial calculation has shown significant effects in preventing wedge instability and rock weathering.

Claims

1. A method for targeted reinforcement of wedge-shaped rock slopes using point cloud modeling and spatial computation, characterized in that, Includes the following steps: Acquire point cloud data of rock slopes; A solid model is generated and gridded based on point cloud data of rock slope to obtain a gridded rock slope model. Based on the gridded rock slope model, fault cutting and spatial calculations are performed to obtain the anchor coordinates of the fault location and calculate the spatial distance between each anchor node and the fault plane, thus identifying the anchor points that need targeted reinforcement. For anchor points that require targeted reinforcement, optimize the anchor bolt structure and complete the anchoring system construction; Construct a weather-resistant composite surface layer; The specific method for fault cutting and spatial calculation based on the gridded rock slope model is as follows: The gridded rock slope model was imported into numerical analysis software. Anchor point coordinates, anchor angles, and fault attitude parameters were added through a parametric command flow. After numbering the anchors, they were cut along the fault plane. After retaining the wedge shape, the anchor coordinates at the fault location were determined based on the anchor point coordinates, anchor angles, anchor lengths, and fault attitude information. The spatial distance between each anchor node and the fault plane was calculated based on the anchor point coordinates and the anchor coordinates at the fault location. In the calculation results, anchor points with a spatial distance greater than 0 from the fault plane were identified as anchor points that required targeted reinforcement. The specific optimization method for the anchor bolt structure is to adopt a segmented anchor bolt structure. The segmented anchor bolt structure includes the anchor bolt and internal reinforcement, with the anchorage angle remaining the same as the original anchor bolt design. The total length of the internal reinforcement is the same as the original anchor bolt design length, including a standard section and a reinforced section. The section closest to the fault is the reinforced section, with a diameter 1.5 times that of the standard section. The length h of the reinforced section is dynamically adjusted based on the rock mass integrity coefficient at the site. Specifically, it is determined based on the rock mass quality indicators shown in the engineering geological survey data, as follows: When the rock mass quality index is ≤25%: h=0.4H, the center of the reinforced section is located at the fault; When 25% < rock mass quality index ≤ 50%, h = 0.3H, and the center of the reinforced section is located at the fault. When the rock mass quality index is >50%, h=0.2H, and the center of the reinforced section is located at the fault. Where h is the length of the reinforced section and H is the total length of the internal reinforcement of the anchor rod.

2. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 1, characterized in that: The method for obtaining point cloud data of rock slopes is as follows: By using UAV close-range photogrammetry technology to acquire image data of rock slopes at multiple heights and angles, and then using image processing software to process the image data, three-dimensional point cloud data containing the actual characteristics of the rock slopes are generated.

3. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 2, characterized in that: The drone's forward overlap is greater than 70%, and its lateral overlap is greater than 60%.

4. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 2, characterized in that: The process of image processing software in processing image data includes image alignment, distortion correction, and 3D reconstruction.

5. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 1, characterized in that: When generating a solid model and dividing it into grids based on point cloud data of rock slopes, a grid dividing tool is used to perform non-uniform gridding on the solid model.

6. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 1, characterized in that: When constructing the weather-resistant composite surface layer, first lay an anti-corrosion metal mesh and implement slope waterproofing treatment; then use adjustable connectors to keep the wire mesh 20mm~30mm away from the slope to form a stress buffer space; finally spray a layer of concrete to form a composite protective surface layer that isolates the atmosphere.

7. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 6, characterized in that: The anti-corrosion metal mesh laid is a galvanized steel wire mesh with a mesh size of 50mm×50mm and a wire diameter of ≥3mm; The process of spraying concrete is to spray in layers: the first layer is a 10mm~20mm thick polymer waterproof mortar layer, and the second layer is a 60mm~80mm thick steel fiber concrete layer.

8. The method for targeted reinforcement of wedge-shaped rock slopes based on point cloud modeling and spatial calculation according to claim 7, characterized in that: The fiber content in the steel fiber reinforced concrete layer is 35 kg / m³ to 45 kg / m³, and the fiber aspect ratio is 50 to 80.

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