Method for determining staggered distance between dual coal seam upper-lower simultaneous mining working faces in propelling direction

Abstract

The invention provides a method for determining the staggered distance between dual coal seam upper-lower simultaneous mining working faces in the propelling direction, and belongs to the technical field of coal mining. The method comprises the steps that the ideal staggered distance range is found out and obtained; according to the ideal staggered distance range, an ultimate bearing capacity computational formula during plastic slip of rock and soil is utilized to obtain a computational formula of the maximum depth H<max> of an upper coal seam bottom plate destruction region under the ultimate bearing pressure condition, and thus a computational formula of the maximum horizontal distance L<max> of an upper coal seam bottom plate broken rock stratum is obtained; a pressure-stabilizing mechanical model and a pressure-reducing mechanical model for the propelling direction of upper-lower coal seam working face simultaneous mining of dual coal seam mining are established, thus the maximumhorizontal distance of the upper coal seam bottom plate broken rock stratum, the bottom plate stress transfer angle and the spacing between an upper coal seam and a lower coal seam are obtained, and acomputational formula of the staggered distance in the pressure-stabilizing propelling direction and the pressure-reducing propelling direction is determined; and the computational result in the step3 is corrected. According to the method, the mine pressure strength of the lower coal seam working face and the earth surface damage degree during simultaneous mining of the dual coal seam superposition regions can be effectively lowered, and efficient and environment-friendly mining of the dual coal seams is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for determining the stagger distance of the advancing direction of the upper and lower co-mining working faces of double coal seams. Background technique [0002] Coal is an important energy source in my country. In order to achieve efficient coal mining, coal enterprises have begun to shift from single coal seam mining to dual coal seam simultaneous mining. Simultaneous mining of double coal seams mainly involves two technical problems: one is that the high-intensity mining of double coal seams causes the overlying strata to move violently, which in turn causes excessive concentration of surface tensile stress and seriously damages the surface ecological environment; the other is the superposition of upper and lower coal seams The area is mined at the same time, and the surrounding rock stress of the lower coal seam working face is complex and severe, wh...

AI Technical Summary

Problems solved by technology

[0004] At present, for the simultaneous mining of the upper and lower coal seams in the superimposed area, the method of stopping mining and avoiding pressure is often used on site to solve the problems of large-area pressure on the working face of the lower coal seam and crushing of supports, resulting in tension in mine mining and low production efficiency

At the same time, high-intensity mining has caused serious damage to the surface and the ecological environment has continued to deteriorate

The existing double coal seam mining technology cannot take into account safe and efficient mining and slow down surface damage, and there is no research on the staggered distance of the advancing direction of the upper and lower co-mining working faces of the double coal seam

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