Reamer-pillar residual mining area upstream mining feasibility determination method suitable for dynamic disturbance loading

Abstract

The invention discloses a reamer-pillar residual mining area upstream mining feasibility determination method suitable for dynamic disturbance loading and belongs to the technical field of coal mining. Firstly, the distribution positions of a reamer-pillar residual mining area and a remaining coal seam are ascertained, the rock formation composition, structure and physical and mechanical parameters of interlayer rock formations are obtained, and the interlayer rock formations are uniformly divided and numbered from bottom to top; then the position of a control rock formation is determined, themagnitudes of the disturbance loads of bearing pressure acting on a reamer-pillar residual mining area remaining coal pillar and the control rock formation after propagation attenuation are calculated, and finally, the stability of the reamer-pillar residual mining area remaining coal pillar and the control rock formation is analyzed by considering the effect of dynamic disturbance loading, to obtain a judgment result of the reamer-pillar residual mining area upstream mining feasibility. The method avoids the situation that the empirical method has large errors, and provides a theoretical basis for the safe mining of the upstream residual coal of the reamer-pillar residual mining area, improves the recovery rate of the coal resources in the upper part of the reamer-pillar residual miningarea, and effectively prolongs the service life of the mine.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for judging the feasibility of upward mining in a residual mining area of ​​a knife post under dynamic and disturbance loading. Background technique [0002] With the increase of coal mining intensity, coal resources with better mining conditions in many mining areas are gradually decreasing. The remaining coal seam in the upper part of the residual mining area has considerable reserves and good mining value, and the problem of its safe mining has become increasingly prominent. [0003] The existing identification methods for upward mining in residual mining areas mainly refer to the identification methods of caving upward sequential mining, namely the ratio identification method, the "three-zone" identification method and the surrounding rock balance method. These judgment methods are basically based on layer spacing and mining thickness, and the main p...

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Problems solved by technology

[0004] (1) The above method is not suitable for the determination of upward mining in the residual mining area of ​​the cutter column, and only stays at the qualitative experience level, which cannot meet the requirements of production practice;

[0005] (2) The existing methods for judging the feasibility of upward mining in the residual mining area of ​​the knife column do not study the stability of the remaining coal pillars and interlayer rock formations in the residual mining area of ​​the knife column as a system, and do not give a quantitative determination formula for stability;

[0006] (3) The existing judgment method does not consider the effect of the disturbance load generated during the mining of the upper residual coal seam on the residual coal pillar and interlayer rock formation system in the residual mining area of ​​the cutter column, and the upper disturbance load is the cause of the instability of the...

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