Method for measuring cranny evolvement of mining coal-rock mass

Abstract

The invention relates to a method for measuring cranny evolvement of a mining coal-rock mass. The method comprises the following steps of (1) determining a coal layer needing the gas governance and distributing measuring pores; (2) inputting a three-dimensional coordinate of the center of the opening and the bottom of each measuring pore into a computer; (3) installing an essence safety-type drilling imaging instrument into each measuring pore, and collecting wall video information in different depths of each measuring pore by utilizing the imaging instrument in the coal mining process; (4) converting the collected wall video information in different depths of each measuring pore into a wall unfolded binary image of each measuring pore, and calculating fractal dimension of a crack network of each measuring pore; (5) classifying the fractal dimension of the crack network of the measuring pores which are in identical distance to a coal mining working surface into one group, and averaging each group of fractal dimension to obtain the average fractal dimension of the coal-rock mass crack network which is differently distanced to the coal mining working surface in the advancing process of the coal mining working surface.

Description

technical field [0001] The invention belongs to the technical field of mine safety, in particular to a method for measuring the crack evolution of mining coal and rock mass. Background technique [0002] Gas has always been the main factor affecting the safe production of coal mines. With the increase of coal mining depth, gas disasters will become more obvious, and a large number of shallow low-gas mines are gradually turning into high-gas mines. The number of gas accidents and the fatality rate are both It is increasing year by year. On the other hand, the damage of gas to the atmospheric environment is also very serious. The ability of gas to destroy the ozone layer is CO 2 7 times that of CO, the greenhouse effect it produces is CO 2 21 times. [0003] For coal seams with low permeability, strong adsorption, and high gas content, it is usually very difficult to extract gas from the ground, and it is necessary to implement effective artificial permeability enhancement ...

AI Technical Summary

Problems solved by technology

At present, the methods used to obtain the fracture law of coal and rock mass include physical model test method and numerical simulation method. However, due to the complex boundary conditions of the coal mining site, the existing methods cannot accurately simulate the complex site conditions. The law of body breaking is not true, and it has little practical significance for the actual guidance of gas control projects

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