A mining replacement design method for close-distance coal seam upper and lower cooperative mining

Abstract

The invention provides a method for excavation succession design of up-down alternating collaborative exploitation in close distance coal seams. The method is suitable for downhole use of multiple coal seams. The method includes the steps that a, the position relationship between two working faces of the close distance coal seams and the position relationship between the working faces and a roadway are classified, researched and defined; b, for the different position relationships between the working faces as well as between the working faces and the roadway as defined in the step a, the characteristic quantities that have a decisive influence on an excavation succession law are designed and given under the conditions of the corresponding positional relationships; c, characteristic valuescorresponding to the characteristic quantities are determined through methods of numerical simulation and theoretical research; and d, the different position relationships in the step a are matched according to the actual production requirements of a mining lot, and the corresponding characteristic quantities are constrained under the matched 'characteristic values' to conduct excavation succession design of up-down alternating collaborative exploitation in the close distance coal seams. Through a set of methods, the method of up-down alternating collaborative exploitation in the close distance coal seams is designed reasonably, the phenomenon of stress concentration under the influence of multiple excavation is effectively prevented and avoided, and the method has simple steps and wide application range.

Description

technical field [0001] The invention relates to an excavation replacement design method for close-distance coal seam upper and lower coordinated mining, and is especially suitable for a short-distance coal seam upper and lower coordinated mining excavation design method used underground in multi-coal seams. Background technique [0002] When coal seams are mined at close distances, there is usually a significant impact between the coal seams, especially the upward mining destroys the original stress balance state of the overlying strata in the stope, and the redistributed stress can easily exceed the ultimate strength of the coal body, resulting in the destruction of the overlying strata. . However, as some mines in my country suffer from resource depletion, rock bursts, coal and gas outbursts and other problems, many mining areas have put forward the demand for upward mining or coordinated mining from top to bottom. For the unconventional upper-lower-by-subordinate coordin...

AI Technical Summary

Problems solved by technology

After the succession of the working face is completed, the stress redistribution and rock movement caused by mining often have a great impact on the subsequent succession work

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