Coal face fissure zone gas extraction method

Abstract

The invention discloses a coal face fissure zone gas extraction method. According to the principle of the coal face fissure zone gas extraction method, before working face stoping, a drill hole arrangement method is determined through goaf overlying strata movement and gas seepage research, staggered high and low fissure zone directional long drill holes along the working face trend are arranged in a drilling field in a working face air return gate road, a main hole section of the high-position drill hole extends within the range of 30 m above a goaf formed after stoping of the working face, the low-position drill hole sinks properly at the position of the working face, a low negative pressure balanced extraction mode is adopted for the low-position drill hole, a high negative pressure balanced extraction mode is adopted for the high-position drill hole, and gas in a fissure zone and the goaf after stoping of the working face is extracted. According to the method, gas in the coal facefissure zone can be fully extracted, the gas concentration in the upper corner and the return air flow of the stoping face is reduced, meanwhile, the effect of treating goaf gas is achieved, gas treatment of the working face is achieved, and safe stoping of the coal face is guaranteed.

Description

technical field [0001] The invention relates to a gas drainage method, which belongs to the field of gas control and gas drainage in coal mining working faces, and in particular to a gas drainage method in a fissure zone of a coal mining working face. Background technique [0002] The geological conditions of my country's coal fields are complex, which can easily lead to various major safety accidents. Among them, the gas associated with coal and existing in coal seams is one of the biggest disaster-causing factors that threaten the safety of my country's coal mines. At the same time, gas is a clean and efficient energy source. If these gas resources are effectively extracted, it will greatly alleviate the energy shortage in our country. Therefore, no matter from the perspective of ensuring mine safety production or resource utilization, coal mine gas should be extracted. [0003] Due to the high intensity of comprehensive mechanized coal mining in coal mines, concentrated ...

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Problems solved by technology

Due to the influence of the technical conditions of the drilling equipment and the designed azimuth and horizon, the common borehole in the fan-shaped fracture zone and the ordinary borehole in the parallel fracture zone are quite different. During the replacement period of the drilling site, there were periodic high levels, and the effective utilization rate of the drilling holes was low; although the treatment effect of the high-pressure roadway was good, the excavation cost was high, the construction period was long, and the construction had to be carried out ahead of time, which brought great difficulties to the connection of the coal mining face of the mine. a lot of pressure

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