Outburst elimination method for deep high gassy high ground stress multi-structure coal roadway

Abstract

The invention belongs to the technical field of coal mine gas control, and particularly discloses an outburst elimination method for a deep high-gas high-geostress multi-structure coal roadway. The outburst elimination method includes the following steps that S100, a gas area is divided into a relatively low-gas area, a relatively high-gas area and a high-gas area; S200, treatment measures are formulated for different areas separately; S300, if the situation that any one of the gas parameters and characteristics exceeds the requirements of the area of the level appears once in the relatively low-gas area and the relatively high-gas area, the area of the level is upgraded to the level area in which the gas parameters and characteristics are located, and the corresponding gas treatment measure in the area is implemented; S400, after the high-gas area is subjected to the measure and allowed to be excavated, the gas parameters and characteristics are lower than the requirements of the areaof the level, and the area gas level is downgraded from the high-gas area to the relatively high-gas area; and S500, the relatively high-gas area is subjected to the measure and allowed to be excavated, the gas parameters and characteristics are lower than the requirements of the area of the level, and the area gas level is downgraded from the high-gas area to the relatively low-gas area.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control, in particular to a method for eliminating outbursts in deep high gas, high ground stress and multi-structure coal roadways. Background technique [0002] Gas is stored in coal seams in two ways: free and adsorbed. Free gas is mainly stored in cracks and pores, and adsorbed gas is mainly stored on the surface of micropores. The two are in a dynamic equilibrium state under a certain pore pressure and temperature. There are two modes of gas flow in coal seams: one is gas seepage flow in cracks and pores; the other is that adsorbed gas desorbs from the surface of micropores and diffuses from micropores to cracks and pores. The former is governed by the seepage equation and the latter by the diffusion law. During the process of coal roadway excavation, mining destroys the original rock stress balance of the coal body around the excavation space, and redistributes the stress in the coal ...

AI Technical Summary

Problems solved by technology

However, the gas content in some coal lanes is still relatively high

In addition, if only the problem of gas concentration affecting the working conditions is considered, the problems caused by the high gas content in the surrounding rock to the roadway support under the condition of high stress and multiple structures are not considered, especially if the possible high gas conditions are not considered. Targeted control of the roadway surrounding rock due to the hazards of rockburst and coal and gas outbursts, there are great safety hazards