CN110991885A - Method for evaluating easiness of developing of regional bedding rock slope - Google Patents
Method for evaluating easiness of developing of regional bedding rock slope Download PDFInfo
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Abstract
The invention discloses a method for evaluating the proneness of a regional bedding rock slope, which comprises the following steps: A. judging the type of the slope structure through the spatial analysis of a geographic information system; B. the relation between the rock stratum inclination angle and the gradient is analyzed and judged through a geographic information system space; C. dividing the lithology of the regional stratum into an easy-sliding rock group, an even-sliding rock group and a stable rock group by combining a geological map and field geological investigation; D. and D, combining the slope structure type, the rock stratum inclination angle and gradient relation and the stratum lithology data obtained in the steps A to C, and performing grid calculation and reclassification through spatial analysis of a geographic information system to finally obtain the region of the region bedding rock slope proneness. The method breaks through the limitation of manually defining the subarea of the bedding rock slope proneness in the prior art, comprehensively considers the main forming conditions of the bedding rock slope, and adopts a quantitative evaluation method to greatly improve the precision of the evaluation subarea.
Description
Technical Field
The invention relates to the technical field of geological disaster susceptibility evaluation, in particular to a regional bedding rock slope susceptibility evaluation method.
Background
The bedding slope is a slope structure with the worst stability and the most easy deformation and damage in the rock slope, and often causes a plurality of engineering geological problems. For example, the construction of road excavation and slope cutting, reservoir storage, construction of engineering facilities on a slope body, and the like all change and destroy the balance state of the original slope, and if the engineering control measures and management are not proper, a series of slope problems can be caused. The instability of the slope not only relates to the safety problem of the engineering, but also can indirectly influence the surrounding human living environment and the engineering construction, thereby bringing a series of environmental and social safety problems.
The bedding rock slope proneness can be generally evaluated in a regionalization mode, basic data are provided for urban construction and economic development and reasonable resource development and utilization, and the method has very important significance in reducing the damage of geological disasters to lives and properties of local residents and the like. The traditional bedding rock slope proneness evaluation usually manually defines proneness subareas, so that the evaluation efficiency and precision are greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects in the background technology, provides a method for evaluating the proneness of a regional bedding rock slope, comprehensively considers the formation mechanism of the bedding rock slope, selects three factors of a slope structure type, a relation between a rock inclination angle and a slope and formation lithology to construct a regional bedding rock slope proneness evaluation index system, and realizes the partition evaluation of the proneness of the regional bedding rock slope.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a method for evaluating the proneness of a regional bedding rock slope comprises the following steps:
A. judging the type of the slope structure through the spatial analysis of a geographic information system;
B. the relation between the rock stratum inclination angle and the gradient is analyzed and judged through a geographic information system space;
C. dividing the lithology of the regional stratum into an easy-sliding rock group, an even-sliding rock group and a stable rock group by combining a geological map and field geological investigation;
D. combining the slope structure type, the relation between the rock stratum inclination angle and the gradient and the stratum lithology data obtained in the steps A to C, and performing grid calculation and reclassification through spatial analysis of a geographic information system to finally obtain a region of the region bedding rock slope proneness;
the spatial analysis technology used in the scheme is a core technology of a geographic information system, is a technology for extracting potential spatial information through quantitative analysis of geographic spatial data, belongs to the prior art, and is not described herein again.
Further, the step a includes:
A1. analyzing the terrain slope direction of the area through a digital elevation model DEM;
A2. combining the geological map with the field geological survey to finish regional rock tendency zoning;
A3. and judging the type of the slope structure according to the included angle between the terrain slope direction and the rock stratum tendency.
Specifically, the Digital Elevation Model (DEM) in the present embodiment is a solid ground Model that realizes Digital simulation of ground terrain through limited terrain Elevation data, and represents ground Elevation in the form of a group of ordered numerical arrays, which belongs to the existing Model technology and is not described herein again.
Further, the slope structure type includes a forward slope, an oblique slope, a transverse slope and a reverse slope, the oblique slope is divided into a forward oblique slope and a reverse oblique slope, and the transverse slope is divided into a forward transverse slope and a reverse transverse slope.
Further, when the slope structure type is judged, an included angle between the terrain slope direction and the rock stratum inclination is analyzed, the included angle interval is 180 degrees, wherein the slope structure type is a forward slope if the included angle is 0-30 degrees, the slope structure type is a forward oblique slope if the included angle is 30-60 degrees, the slope structure type is a forward transverse slope if the included angle is 60-90 degrees, the slope structure type is a reverse transverse slope if the included angle is 90-120 degrees, and the slope structure type is a reverse slope if the included angle is 150-180 degrees, and the included angle interval description includes the upper limit and the lower limit.
Further, the step B includes:
B1. analyzing the slope of the regional terrain slope through a digital elevation model DEM;
B2. combining a geological map with field geological investigation to finish regional rock stratum inclination angle partitioning;
B3. analyzing the size of the terrain slope and the rock stratum inclination angle, and judging the relation between the rock stratum inclination angle and the slope, wherein the rock stratum inclination angle and the slope comprise the following relations: the inclination angle of the rock stratum is less than the slope gradient, and the inclination angle of the rock stratum is not less than the slope gradient.
Further, the step D specifically includes:
D1. grading and assigning the obtained slope structure type, the relation between the rock stratum inclination angle and the gradient and the stratum lithology data by using a grid reclassification tool in the space analysis of the geographic information system;
D2. carrying out grid operation on the graded and assigned slope structure type, the relation between the rock inclination angle and the gradient and the stratum lithology layer by utilizing a grid calculator tool in the space analysis of the geographic information system to obtain the region bedding rock slope volatile value;
D3. and performing reclassification treatment on the region bedding rock slope susceptibility value obtained by grid operation calculation by using a grid reclassification tool in the space analysis of the geographic information system, and finally obtaining the region bedding rock slope susceptibility subarea.
Further, in step D1, when performing hierarchical assignment, specifically, the hierarchical assignment criterion of the ramp structure type is: the forward slope meter is divided into 4 minutes, the oblique slope meter is divided into 3 minutes, the transverse slope meter is divided into 2 minutes, and the reverse slope meter is divided into 1 minute;
the graded assignment standard of the relation between the rock stratum inclination angle and the gradient is as follows: the dip angle of the rock stratum is less than 3 minutes of a slope meter, and the dip angle of the rock stratum is more than or equal to 1 minute of the slope meter;
the grading assignment standard of the lithology of the stratum is as follows: 4 points of easy sliding rock group meter, 3 points of easy sliding rock group meter, 2 points of even sliding rock group meter and 1 point of stable rock group meter.
Further, the specific operation formula when performing the grid operation in step D2 is as follows: the region bedding rock slope tendency value is the slope structure type score x + the relation score of the rock inclination angle and the slope gradient y + the formation lithology score z, wherein x + y + z is 1.
Further, x is 0.4, y is 0.3, and z is 0.3.
Further, in the step D3, the region bedding rock slope susceptibility is divided into a low susceptibility region, a medium susceptibility region and a high susceptibility region according to the region bedding rock slope susceptibility value calculated in the step D2.
Compared with the prior art, the invention has the following beneficial effects:
the method for evaluating the proneness of the regional bedding rock slope breaks through the limitation of manually defining the subarea of the proneness of the bedding rock slope in the prior art, comprehensively considers the main forming conditions of the bedding rock slope, selects three factors of the slope structure type, the relation between the rock inclination angle and the gradient and the stratum lithology to construct a regional bedding rock slope proneness evaluation index system, realizes the subarea evaluation of the regional bedding rock slope proneness, and greatly improves the precision of the evaluation subarea.
Drawings
FIG. 1 is a schematic flow chart of the method for evaluating the susceptibility of a zonal bedrock slope according to the present invention;
FIG. 2 is a schematic illustration of a terrain slope of an area in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a regional formation dip profile in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of a distribution of regional ramp structure types in one embodiment of the present invention;
FIG. 5a is a schematic diagram illustrating an analysis of the impact of the formation dip angle on a geological disaster (the formation dip angle is greater than or equal to the slope gradient) under a forward slope condition according to an embodiment of the present invention;
FIG. 5b is a schematic illustration of an analysis of the impact of formation dip on geological hazards under forward slope conditions (formation dip < slope gradient) in one embodiment of the invention;
FIG. 6 is a schematic illustration of terrain gradients in a region in accordance with an embodiment of the present invention;
FIG. 7 is a schematic illustration of a regional formation dip angle distribution in accordance with an embodiment of the present invention;
FIG. 8 is a graphical illustration of regional formation dip angle versus slope in an embodiment of the present invention;
FIG. 9 is a schematic illustration of a zonal lithology section of a formation in accordance with an embodiment of the present invention;
fig. 10 is a schematic illustration of a regional bedding rock slope incident zoning in an embodiment of the present invention.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments of the invention described hereinafter.
Example (b):
the first embodiment is as follows:
as shown in fig. 1, a method for evaluating the susceptibility of a regional bedding rock slope comprises the following steps:
step 1, carrying out field geological survey, and surveying stratum attitude (inclination, dip angle) and stratum lithology in a region by combining regional geological data.
And 2, determining the type of the slope structure in the area by combining the digital elevation model DEM, the geological map and the field geological survey data. The method specifically comprises the following operations:
and 2.1, analyzing an area terrain slope map through a digital elevation model DEM, wherein the area terrain slope map obtained in the embodiment is shown in FIG. 2.
Step 2.2, combining the geological map with the regional rock tendency distribution map of the field geological survey, specifically, the regional rock tendency distribution map obtained in the embodiment is shown in fig. 3.
Step 2.3, analyzing an included angle between the terrain slope direction and the rock stratum inclination direction (a specific interval is 180 degrees) by utilizing a geographic information system space analysis function, wherein in the embodiment, the slope structure types are specifically divided into: the structural type distribution diagram of the region slope is obtained according to the included angle range of the terrain slope and the rock stratum inclination, and is shown in fig. 4.
Table 1: slope structure type division standard
And 3, determining the relation between the inclination angle and the gradient of the rock stratum in the region by combining the digital elevation model DEM, the geological map and the field geological survey data, wherein in a common situation, as shown in a figure 5a and a figure 5b, in a bedding slope, when the inclination angle of the rock stratum is not less than the gradient of the slope, the slope body is not easy to slide, and when the inclination angle of the rock stratum is less than the gradient of the slope, the slope body is easy to slide.
The specific operation is as follows:
step 3.1, analyzing a terrain gradient map of the area through a digital elevation model DEM, wherein the terrain gradient map of the area obtained in the embodiment is shown in FIG. 6;
step 3.2, combining the geological map with a field geological survey to finish a regional rock inclination angle distribution map, wherein the regional rock inclination angle distribution map obtained in the embodiment is shown in fig. 7;
and 3.3, analyzing the size relation of the included angle between the terrain slope direction and the rock stratum inclination by utilizing the space analysis function of the geographic information system to obtain a relation graph of the inclination angle and the slope of the regional rock stratum, wherein the relation graph of the inclination angle and the slope of the regional rock stratum obtained in the embodiment is shown in FIG. 8.
And 4, combining the geological map and a regional geological survey to complete regional stratum lithologic partition maps, and dividing the stratum lithologic partition maps into an easy-sliding rock group, an even-sliding rock group and a stable rock group, wherein the regional stratum lithologic partition map obtained in the embodiment is shown in fig. 9.
TABLE 2 ramp Structure type partition criteria
And 6, carrying out grid operation on the graded slope structure type, the rock stratum inclination angle and gradient relation and the stratum lithology pattern layer by using a grid calculator tool in the geographic information system spatial analysis to obtain an area bedding rock slope volatile value distribution diagram, wherein the specific operation formula is as follows: the gradient value of the region bedding rock slope is 0.4+ the relation between the rock inclination angle and the gradient is 0.3+ the formation lithology is 0.3.
And 7, carrying out reclassification treatment on the region bedding rock slope easiness distribution map obtained by grid operation calculation by using a grid reclassification tool in the geographic information system spatial analysis, wherein specific reclassification standards in the embodiment refer to a table 3, and finally obtaining a region bedding rock slope easiness partition map, wherein the region bedding rock slope easiness partition map obtained in the embodiment is shown in fig. 10.
TABLE 3 bedding rock slope development tendency reclassification standard
| Easiness of hair growth | Value range of easy value |
| Low susceptibility to hair | [1,1.8) |
| Moderate and easy to send out | [1.8,2.5) |
| High susceptibility to hair | [2.5,4] |
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for evaluating the proneness of a regional bedding rock slope is characterized by comprising the following steps:
A. judging the type of the slope structure through the spatial analysis of a geographic information system;
B. the relation between the rock stratum inclination angle and the gradient is analyzed and judged through a geographic information system space;
C. dividing the lithology of the regional stratum into an easy-sliding rock group, an even-sliding rock group and a stable rock group by combining a geological map and field geological investigation;
D. and D, combining the slope structure type, the rock stratum inclination angle and gradient relation and the stratum lithology data obtained in the steps A to C, and performing grid calculation and reclassification through spatial analysis of a geographic information system to finally obtain the region of the region bedding rock slope proneness.
2. The method for evaluating the susceptibility of the regional bedding rock slope according to claim 1, wherein the step A comprises the following steps:
A1. analyzing the terrain slope direction of the area through a digital elevation model DEM;
A2. combining the geological map with the field geological survey to finish regional rock tendency zoning;
A3. and judging the type of the slope structure according to the included angle between the terrain slope direction and the rock stratum tendency.
3. The method for evaluating the susceptibility of a regional bedding rock slope according to claim 2, wherein the slope structure types comprise a forward slope, an oblique slope, a transverse slope and a reverse slope, the oblique slope is divided into a forward oblique slope and a reverse oblique slope, and the transverse slope is divided into a forward transverse slope and a reverse transverse slope.
4. The method for evaluating the proneness of the regional bedding rock slope according to claim 3, characterized in that when a slope structure type is judged, an included angle between a terrain slope direction and a rock stratum inclination is analyzed, the included angle interval is 180 degrees, wherein the slope structure type is a forward slope if the included angle is 0-30 degrees, the slope structure type is a forward oblique slope if the included angle is 30-60 degrees, the slope structure type is a forward transverse slope if the included angle is 60-90 degrees, the slope structure type is a reverse transverse slope if the included angle is 90-120 degrees, and the slope structure type is a reverse slope if the included angle is 150-180 degrees.
5. The method for evaluating the susceptibility of the regional bedding rock slope according to claim 3, wherein the step B comprises the following steps:
B1. analyzing the slope of the regional terrain slope through a digital elevation model DEM;
B2. combining a geological map with field geological investigation to finish regional rock stratum inclination angle partitioning;
B3. analyzing the size of the terrain slope and the rock stratum inclination angle, and judging the relation between the rock stratum inclination angle and the slope, wherein the rock stratum inclination angle and the slope comprise the following relations: the inclination angle of the rock stratum is less than the slope gradient, and the inclination angle of the rock stratum is not less than the slope gradient.
6. The method for evaluating the proneness of the regional bedding rock slope according to claim 5, wherein the step D specifically comprises the following steps:
D1. grading and assigning the obtained slope structure type, the relation between the rock stratum inclination angle and the gradient and the stratum lithology data by using a grid reclassification tool in the space analysis of the geographic information system;
D2. carrying out grid operation on the graded and assigned slope structure type, the relation between the rock inclination angle and the gradient and the stratum lithology layer by utilizing a grid calculator tool in the space analysis of the geographic information system to obtain the region bedding rock slope volatile value;
D3. and performing reclassification treatment on the region bedding rock slope susceptibility value obtained by grid operation calculation by using a grid reclassification tool in the space analysis of the geographic information system, and finally obtaining the region bedding rock slope susceptibility subarea.
7. The method for evaluating the proneness of the regional bedding rock slope according to claim 6, wherein in the step D1, when the grading assignment is performed, the grading assignment criterion of the slope structure type is as follows: the forward slope meter is divided into 4 minutes, the oblique slope meter is divided into 3 minutes, the transverse slope meter is divided into 2 minutes, and the reverse slope meter is divided into 1 minute;
the graded assignment standard of the relation between the rock stratum inclination angle and the gradient is as follows: the dip angle of the rock stratum is less than 3 minutes of a slope meter, and the dip angle of the rock stratum is more than or equal to 1 minute of the slope meter;
the grading assignment standard of the lithology of the stratum is as follows: 4 points of easy sliding rock group meter, 3 points of easy sliding rock group meter, 2 points of even sliding rock group meter and 1 point of stable rock group meter.
8. The method for evaluating the susceptibility of the regional bedding rock slope according to claim 7, wherein the specific operation formula when performing the grid operation in the step D2 is as follows: the region bedding rock slope tendency value is the slope structure type score x + the relation score of the rock inclination angle and the slope gradient y + the formation lithology score z, wherein x + y + z is 1.
9. The method of claim 8, wherein x is 0.4, y is 0.3, and z is 0.3.
10. The method for evaluating the susceptibility of the regional bedding rock slope according to claim 8, wherein in the step D3, the regional bedding rock slope susceptibility is divided into a low susceptibility region, a medium susceptibility region and a high susceptibility region according to the regional bedding rock slope susceptibility value calculated in the step D2.
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| CN112508061A (en) * | 2020-11-19 | 2021-03-16 | 长江三峡勘测研究院有限公司（武汉） | Rock engineering slope stability classification method |
| CN113408201A (en) * | 2021-06-18 | 2021-09-17 | 河南大学 | Landslide susceptibility evaluation method based on terrain unit |
| CN113554750A (en) * | 2021-06-09 | 2021-10-26 | 贵州师范学院 | Karst trough forward and reverse slope automatic identification method based on GIS |
| CN115391896A (en) * | 2022-09-01 | 2022-11-25 | 中国科学院地质与地球物理研究所 | Slope instability prone area identification method and device based on double parameters of height difference and gradient |
| CN116912306A (en) * | 2023-07-27 | 2023-10-20 | 广东省核工业地质调查院 | Rock slope stability evaluation method and system based on in-hole television |
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Application publication date: 20200410 |