Method for locating potentially dangerous areas of a slope in the field

Abstract

The method for positioning potential dangerous area of slope in situ of the present application relates to the technical field of slope engineering, and establishes a three-dimensional model of slope entity by a three-dimensional grid map of slope surface and drilling position and rock size, then obtains a horizontal displacement nephogram of slope by mechanical analysis, and determines potential sliding body in the three-dimensional model of slope entity according to the nephogram, so that the boundary node coordinates of the sliding body can be obtained, the boundary node coordinates of the sliding body are marked in situ, and the potential dangerous area of slope is obtained, thereby solving the problem that the dangerous area of slope in situ cannot be reflected in the prior art, and the present application is suitable for slope construction and slope support.

Description

Technical Field

[0001] This invention relates to the field of slope engineering technology, and in particular to a method for locating potentially hazardous areas of slopes in the field. Background Technology

[0002] Slopes are involved in the planning of railway engineering, highway engineering, municipal engineering and other projects. Slope instability can paralyze infrastructure and damage the environment. In severe cases, it can cause huge losses to people's lives and property. Therefore, slope protection design is an indispensable part of preventing slope damage. Slope protection design is generally based on engineering analogy analysis, theoretical calculation analysis and monitoring analysis to provide a design scheme.

[0003] In existing technologies, slope safety factors are usually determined through theoretical analysis and calculation, and monitoring and early warning are conducted. However, these methods cannot reflect the dangerous areas of slopes in actual operation. In other words, for slopes that are about to be excavated, construction workers do not know which areas are dangerous. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a method for locating potential hazardous areas of slopes in the field, thereby solving the problem that existing technologies cannot reflect hazardous areas of slopes in the field.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is a method for locating potential hazardous areas of slopes in the field, comprising the following steps:

[0006] S01. Obtain a 3D mesh map of the slope surface;

[0007] S02. Based on the borehole location and rock stratum size, depict the stratigraphic information corresponding to the three-dimensional mesh map of the slope surface, and establish a three-dimensional model of the slope entity in this way.

[0008] S03. Perform mechanical analysis on the three-dimensional model of the slope entity to obtain the horizontal displacement cloud map of the slope.

[0009] S04. Based on the horizontal displacement cloud map of the slope, determine the potential sliding bodies in the three-dimensional model of the slope entity, and extract the coordinates of the boundary nodes of the sliding bodies;

[0010] S05. Mark the potential danger zone of the slope in the field according to the coordinates of the boundary nodes of the slip body.

[0011] Furthermore, obtaining a three-dimensional mesh map of the slope surface includes the following steps:

[0012] S101. Import the CAD topographic map into the Rhino software and extract the contour point cloud from the CAD topographic map. Save it as a "*.txt" text file, where the point coordinates are separated by commas.

[0013] S102. Use the "Data" function of "Grid" in Surfer software to process the "*.txt" text file and record the values ​​corresponding to "X Direction" and "Y Direction" under "of Nodes". After processing, Surfer software converts it into a "*.grd" format file and uses the "convert" function of "Grid" in the software to output the "*.grd" as a "*.dat" format file. The coordinates in the "*.dat" file are separated by spaces.

[0014] S103. A CSV data file is generated using the data splitting function in Excel office software, wherein the coordinates in the CSV data file are separated by commas;

[0015] S104. Open the CSV file using Notepad software and add a prefix that Rhino software can recognize. The prefix is: Srfptgrid XX YY, where “XX” and “YY” are the values ​​corresponding to “X Direction” and “Y Direction” under “of Nodes”, respectively, and save it as a txt text file.

[0016] S105. Import the txt text file into the Rhino software to obtain a three-dimensional mesh map of the slope surface.

[0017] Furthermore, in step S03, the mechanical analysis process includes defining different rock layers. The definition involves selecting or defining a constitutive model of the rock layer material in numerical simulation software. The constitutive model includes Mohr-Coulomb constitutive model, Hawke-Brown constitutive model, generalized Hawke-Brown constitutive model, and elastic constitutive model. Then, mechanical parameter values ​​are input, including natural unit weight, elastic modulus, internal friction angle, cohesion, and Poisson's ratio. Finally, mechanical analysis is performed using numerical simulation software, including one of Midas GTS NX, FLAC3D, and PFC3D.

[0018] Furthermore, in step S04, the basis for determining the potential sliding bodies in the three-dimensional model of the slope entity is that the displacement value of the nodes in the horizontal displacement cloud map is not less than the allowable displacement value, which is determined according to the "Code for Design of Building Foundation" GB50007-2011 and the "Code for Engineering of Building Slope" GB 50330-2013.

[0019] Furthermore, step S05 also includes marking the coordinates of the sliding body boundary nodes on the map.

[0020] The beneficial effects of this invention are as follows: The method for locating potential hazardous areas of slopes in the field is to establish a three-dimensional model of the slope entity using a three-dimensional mesh map of the slope surface, borehole locations, and rock strata dimensions. Then, through mechanical analysis, a horizontal displacement cloud map of the slope is obtained. Based on the cloud map, potential slip bodies in the three-dimensional model of the slope entity are determined, thereby obtaining the coordinates of the slip body boundary nodes. These coordinates are then marked in the field to obtain the potential hazardous areas of the slope, solving the problem that existing technologies cannot reflect the hazardous areas of slopes in the field. Attached Figure Description

[0021] Appendix Figure 1 This is a contour point cloud map used in the method for locating potential hazardous areas of slopes in the field according to the present invention.

[0022] Appendix Figure 2 This is a three-dimensional grid map of the slope surface in the method for locating potential hazardous areas of slopes in the field according to the present invention.

[0023] Appendix Figure 3 This is a three-dimensional model of the slope entity in the method for locating potential hazardous areas of slopes in the field according to the present invention.

[0024] Appendix Figure 4 This is a mechanical analysis and calculation model in the method for locating potential hazardous areas of slopes in the field according to the present invention.

[0025] Appendix Figure 5 This is a slope displacement cloud map used in the method for locating potentially hazardous areas of slopes in the field according to the present invention. Detailed Implementation

[0026] The present invention provides a method for locating potentially hazardous areas on slopes in the field, comprising the following steps:

[0027] S01. Obtain a 3D mesh map of the slope surface;

[0028] Specifically, obtaining a 3D mesh map of the slope surface includes the following steps:

[0029] S101. Import the CAD topographic map into Rhino software and extract the contour point cloud from the CAD topographic map, as shown in the attached figure. Figure 1 As shown, save it as a "*.txt" text file, where the coordinates of points are separated by commas.

[0030] S102. Use the "Data" function of "Grid" in Surfer software to process the "*.txt" text file and record the values ​​corresponding to "X Direction" and "Y Direction" under "of Nodes". After processing, Surfer software converts it into a "*.grd" format file and uses the "convert" function of "Grid" in the software to output the "*.grd" as a "*.dat" format file. The coordinates in the "*.dat" file are separated by spaces.

[0031] S103. A CSV data file is generated using the data splitting function in Excel office software, wherein the coordinates in the CSV data file are separated by commas;

[0032] S104. Open the CSV file using Notepad software and add a prefix that Rhino software can recognize. The prefix is: Srfptgrid XX YY, where “XX” and “YY” are the values ​​corresponding to “X Direction” and “Y Direction” under “of Nodes”, respectively, and save it as a txt text file.

[0033] S105. Import the txt text file into the Rhino software to obtain a 3D mesh map of the slope surface, as shown in the attached image. Figure 2 As shown.

[0034] If you directly import the CAD topographic map into the Rhino software to create a 3D mesh map of the slope surface, it may cause the Rhino software to report an error. Therefore, the purpose of using Surfer software is to reconstruct the contour points cloud to optimize the software and avoid errors in the Rhino software.

[0035] S02. Based on the borehole location and rock stratum size, depict the stratigraphic information corresponding to the three-dimensional mesh map of the slope surface, and establish a three-dimensional model of the slope entity in this way.

[0036] Specifically, the 3D model of the slope is attached. Figure 3 As shown, the three-dimensional model of the slope entity includes the slope surface and stratum information, and the bottom layer information includes rock strata and their thickness.

[0037] S03. Perform mechanical analysis on the three-dimensional model of the slope entity to obtain the horizontal displacement cloud map of the slope.

[0038] Specifically, the mechanical analysis and calculation model is attached. Figure 4As shown, the mechanical analysis process includes defining different rock strata. This definition involves selecting or defining constitutive models of the rock strata materials in numerical simulation software. These constitutive models include Mohr-Coulomb constitutive models, Hawke-Brown constitutive models, generalized Hawke-Brown constitutive models, and elastic constitutive models. Then, mechanical parameter values ​​are input, including natural unit weight, elastic modulus, internal friction angle, cohesion, and Poisson's ratio. Finally, mechanical analysis is performed using numerical simulation software, including one of Midas GTS NX, FLAC3D, and PFC3D. The resulting slope horizontal displacement contour map is attached. Figure 5 As shown.

[0039] S04. Based on the horizontal displacement cloud map of the slope, determine the potential sliding bodies in the three-dimensional model of the slope entity, and extract the coordinates of the boundary nodes of the sliding bodies;

[0040] Specifically, the basis for determining potential slip bodies in the three-dimensional model of the slope entity is that the displacement value of the nodes in the horizontal displacement cloud diagram is not less than the allowable displacement value, which is determined according to the "Code for Design of Building Foundation" GB50007-2011 and the "Code for Engineering of Building Slope" GB 50330-2013.

[0041] S05. Mark the potential danger zone of the slope in the field according to the coordinates of the boundary nodes of the slip body.

[0042] Specifically, marking the boundaries of the landslide body on-site allows construction workers to be aware of potential danger zones on the slope, making them more safety-conscious during excavation. In addition, marking the coordinates of the landslide body boundary nodes on a map provides a theoretical basis for slope support, which can improve the utilization rate of slope support and reduce support costs while ensuring slope safety.

Claims

1. A method of locating potentially dangerous areas of a slope in the field, characterized in that, The method comprises the following steps: S01, obtaining a three-dimensional grid map of a slope surface, which comprises the following steps: S101, importing a CAD topographic map into Rhino software and extracting contour point clouds of the CAD topographic map, and saving them as a "*.txt" text format, wherein the point coordinates in the "*.txt" text format are separated by commas; S102, processing the "*.txt" text file by using the "Data" function of "Grid" in surfer software, and recording the corresponding values of "X Direction" and "Y Direction" below "of Nodes", converting the surfer software processing result into a "*.grd" format file, and outputting the "*.grd" in a "*.dat" format file by using the "convert" function of "Grid" in the software, wherein the coordinates in the "*.dat" file are separated by spaces; S103, forming a CSV data file by using the data column function in Excel office software, wherein the coordinates in the CSV data file are separated by commas; S104, opening the CSV file by using Notepad software, and adding a prefix recognizable by Rhino software, wherein the prefix is Srfptgrid XX YY, and the "XX" and "YY" are respectively the corresponding values of "X Direction" and "Y Direction" below "of Nodes", and the text is saved in txt; S105, importing the txt text into Rhino software to obtain a three-dimensional grid map of a slope surface; S02, depicting stratum information corresponding to the three-dimensional grid map of the slope surface according to the drilling position and the rock stratum size, so as to establish a three-dimensional model of a slope entity; S03, performing mechanical analysis on the three-dimensional model of the slope entity to obtain a slope horizontal displacement cloud map; S04, determining a potential sliding body in the three-dimensional model of the slope entity according to the slope horizontal displacement cloud map, and extracting boundary node coordinates of the sliding body; S05, marking the boundary node coordinates of the sliding body in the field to obtain a potential dangerous area of the slope.

2. The method of locating potentially hazardous areas of a slope in the field according to claim 1, wherein, In step S03, the mechanical analysis process comprises defining different rock strata, the definition being selecting or defining a constitutive model of a rock stratum material in a numerical simulation software, the constitutive model comprising a Mohr-Coulomb constitutive model, a Hoek-Brown constitutive model, a generalized Hoek-Brown constitutive model and an elastic constitutive model, then inputting mechanical parameter values, the mechanical parameter values comprising natural bulk density, elastic modulus, internal friction angle, cohesion and Poisson's ratio, and then performing mechanical analysis by using the numerical simulation software, the numerical simulation software comprising one of Midas GTS NX, FLAC3D and PFC3D.

3. The method of locating potentially hazardous areas of a slope in the field of claim 1, wherein, In step S04, the basis for determining the potential sliding body in the three-dimensional model of the slope entity is that the displacement value of a node in the horizontal displacement cloud map is not less than a displacement allowable value, and the displacement allowable value is determined according to the "Code for Design of Building Foundation" GB50007-2011 and the "Technical Code for Building Slope Engineering" GB 50330-2013.

4. The method of locating potentially hazardous areas of a slope in the field of claim 1, wherein, In step S05, the coordinates of the boundary nodes of the slip body are also marked in the map.

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