Method for quickly determining permeability of working surface front coal body of underground coal mine in lab

Abstract

The invention discloses a method for determining permeability of a working surface front coal body of an underground coal mine, and belongs to the field of preventing and controlling disasters of a coal mine excavation working surface. The method comprises the following steps of firstly determining a coal mine mining-induced stress monitoring system on the spot to obtain a mining-induced stress distribution curve of the working surface front coal body, and combining with a working surface advancing speed to draw a changing curve of mining-induced stress of a coal body unit, which is at a certain distance from the front part of the working surface, in a working surface advancing process; encoding an axle stress loading and confining pressure unloading synchronization servo control program by utilizing Visual C++, and introducing in a true three-axis permeability testing system computer controller, so as to simulate a mining-induced stress changing process of the coal body unit having the certain distance with the front part of the working surface along with the advancing of the working surface by utilizing a true three-axis permeability test; finally obtaining a permeability value and the changing rule of the permeability value of the coal body unit along with the advancing of the working surface. According to the method for determining the permeability of the working surface front coal body of the underground coal mine, the permeability of the coal body in front of the tunneling working surface and the stope face can be precisely and quickly determined.

Description

technical field [0001] The invention belongs to the field of disaster prevention and control of coal mine excavation working face, and in particular relates to a method for quickly measuring the permeability of coal body in front of the underground working face of coal mine in a laboratory. Background technique [0002] Gas disasters are a major factor restricting the safe production of my country's coal mine industry. Problems such as explosions, fires, and coal and gas outbursts caused by mine gas have always existed in the coal production industry and are relatively serious. Gas drainage is an effective means to control mine gas disasters. By arranging drainage boreholes in the coal seam and generating negative pressure inside the boreholes with the help of drainage pumps, the gas existing in the coal seam is extracted from the coal body, thereby reducing the coal seam. The gas content in coal mines can reduce the pressure of coal seam gas, which can eliminate the potenti...

AI Technical Summary

Problems solved by technology

Traditionally, the on-site measurement of coal permeability is cumbersome, and the operating environment is poor, and there is a large deviation between the measurement results and the actual permeability value.

Images