Visual discrimination method of block stability

Abstract

The invention discloses a visual discrimination method for block stability. The visual discrimination method comprises the following steps: 1, acquiring a rock slope image and scanning a rock slope; 2, establishing a three-dimensional visualization model of the rock slope; 3, determining a structural plane equation of the target block; 4, determining a free surface equation of the target block; 5,determining a closed block body; 6, acquiring the area of each structural surface of the closed block body and the volume of the closed block body; and 7, calculating the stability coefficient of theclosed block. A rock slope image is obtained by using an unmanned aerial vehicle aerial photography mode, and a three-dimensional laser scanner is used for acquiring block visual data. The three-dimensional visualization model of the rock slope is constructed, the shape of the block is divided by utilizing the structural surface and the free surface, the stability analysis of the block can be given on site according to the sliding mode of the block, and the method is suitable for the field of stability analysis of blocks with exposed structural surfaces, such as the rock slope or an underground cavern, and is quick and convenient.

Description

technical field [0001] The invention belongs to the technical field of block stability discrimination, and in particular relates to a visual discrimination method for block stability. Background technique [0002] The blocks in the rock mass have different shapes and are chaotic. It takes time and effort for geological exploration personnel to determine the key blocks. Therefore, rock mass engineering often aims to find unstable blocks. Unstable blocks are under the action of engineering force and self-weight. Since the shear strength on the sliding surface is not enough to resist the sliding force, if no engineering anchoring measures are applied, it will inevitably collapse. Unstable blocks. At present, the methods for determining unstable blocks include coordinate projection graphic method, numerical method and stereopolar projection mapping method. The stereographic polar projection drawing method has the advantages of convenient operation, low cost, and suitable for f...

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Problems solved by technology

The stereographic polar projection drawing method has the advantages of convenient operation, low cost, and suitable for field application, so it has been widely used in engineering geologists. However, there are problems such as difficulty in multi-block analysis, difficulty in combining with numerical analysis methods to more accurately determine block stability coefficients, and inaccurate calculation results; numerical methods are accurate , but lacks intuitive

Moreover, the block problem is usually three-dimensional, and the numerical analysis of the three-dimensional elastic-plastic problem on the spot not only requires computer and software conditions, but also takes a long time, which is very inconvenient; the basic method of the coordinate projection graphic method is firstly based on The geometric shape of the block determines the stress state of the block, and then finds out the unstable block through stability analysis. The scalar projection mapping method is a graphical method based on the orthographic projection and combined with the stereopolar projection method. , but it is impossible to do on-site observation and on-site analysis

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