Shallow buried thin bedrock coal bed short wall continuous mining technology suitable condition classification method

Abstract

A method for classifying the application conditions of a shortwall mining (shortwall continuous mining) technology of a shallow coal seam with thin bedrock is applicable to the rational layout and safe and efficient extraction technology mode of roadway excavation of shortwall continuous mining of the shallow coal seam with thin bedrock. The interval of roof breaking of key stratum of main roof is taken as the aggregative indicator of the classification and the uniaxial compressive strength, bedrock thickness, bedrock-load ratio, influence index of working face mining and index of rock mass integrity of overburden rocks are taken as classification indicators; by adopting the fuzzy clustering method, a classification center of the application conditions of the shortwall continuous mining technology of the shallow coal seam with thin bedrock is obtained, with the bedrock thickness as the main indicator; the specific conditions of the seam to be mined are classified according to the indicator of the classification center and each key technical parameter reasonable in classification is determined. The method can effectively improve the production efficiency and recovery ratio of the shallow coal seam with thin bedrock and has wide practicability.

Description

technical field [0001] The invention relates to a method for classifying applicable conditions of shallow-buried thin bedrock coal seam short-wall continuous mining technology, especially suitable for reasonable layout of mining tunnels in shallow-buried thin bedrock short-wall continuous mining working faces and safe and efficient recovery process methods, belonging to coal underground field of mining methods. Background technique [0002] Continuous miner short-wall mechanized mining is developed to improve the resource recovery rate, improve the safety of the working face, improve the environment of the working face, realize high production and high efficiency of the working face, and solve the coal seam mining under the conditions of large mining depth and medium stability of the roof. It is an efficient short-wall coal mining method. Its essence is to excavate a branch roadway along the trench to form a recovery section, and then use a continuous coal mining machine do...

AI Technical Summary

Problems solved by technology

Practice shows that the use of longwall mining system in the case of thin bedrock increases the unsafe factors of mine production

The continuous coal mining machine room pillar mining method has been successfully applied under certain conditions due to its advantages of flexible maneuverability and strong adaptability to coal thickness, and has accumulated a lot of experience that can be used for reference. There is no relatively mature experience in the application, and a complete and systematic short-wall mining mode has not yet been formed, and in production, such as how to choose a reasonable mining tunnel layout when the thickness of the bedrock changes, mining tunnel Coal pillar size and other issues

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