Coal mine working face gas geological risk evaluation method

Abstract

The invention discloses a coal mine working face gas geological risk evaluation method. A working face gas geological evaluation index system comprising coal seam basic characteristics, coal seam structure characteristics, gas emission characteristics and gas outburst characteristics, and a grading standard are constructed, wherein the indexes specifically comprise secondary indexes such as coal seam burial depth, thickness, fault fractal dimension, structural curvature, absolute / relative gas emission amount, gas content, coal body structure and local outburst prediction indexes; a working face scale gas geology grading evaluation method system is determined, and the method specifically comprises the steps of evaluation parameter system establishment and grading, membership function and weight determination, multi-level fuzzy mathematical evaluation model construction, and geology mapping and zoning evaluation. The working face gas geology grading evaluation standard and method meet the actual geological conditions of the Korean mining area, the grading and zoning result is reliable, the potential of being popularized to other high-gas mines and tectonic coal development areas is achieved, and a basic basis can be provided for accurate, safe and efficient coal mining geology guarantee.

Description

technical field [0001] The invention relates to the field of evaluation of coal mine working faces, in particular to a gas geological hazard evaluation method of coal mine working faces. Background technique [0002] Gas geological conditions and dynamic disasters are still the key factors restricting the safe production of coal mines in my country. The research on gas geology in mining working faces is directly aimed at the precise identification of gas occurrence conditions in the production line and the risk of gas dynamic disasters, comprehensive control measures and mining scheme design. It is the direct geological basis to ensure the accurate and safe mining of coal in high-gas mines. Before mining at the working face, based on the latest revealed geological data, extract effective information from it in a timely manner, carry out gas geological classification evaluation and prediction at the working face, identify favorable mining blocks and gas risk blocks, and put fo...

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Problems solved by technology

The structural conditions of the Hancheng mining area are complex, and it is a typical high-gas mining area and coal and gas outburst mining area in my country. In the early stage, a lot of gas and coalbed methane geological evaluations have been carried out at the mining area and minefield scale, which is very important for guiding the development of coal and coalbed methane and ensuring safety Production has played a positive role, but there is a lack of detailed research on gas geology at the working face scale, and the system of evaluation indicators and methods has not been systematically constructed, resulting in the inability to effectively predict gas risks in the mining process, lack of targeted prevention and control measures, and difficulty in adapting to coal precision. Technical requirements for mining

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