Feasibility determination method for upward mining of pillar residual mining area by loading and unloading of dynamic disturbance

Abstract

The present invention discloses a feasibility determination method for upward mining of a pillar residual mining area by loading and unloading of a dynamic disturbance, and belongs to the technical field of coal mining. The feasibility determination method comprises the following steps of: firstly ascertaining a distribution location of the pillar residual mining area and the residual coal seam, obtaining a composition, a structure, physical and mechanical parameters of the interlayer rock stratum, and uniformly dividing and numbering the interlayer rock stratum from bottom to top; then determining the location of a control rock stratum, respectively calculating the magnitude of the disturbance load acting on the residual coal pillars and the control rock layers in the pillar residual mining area by a bearing pressure after propagation attenuation; finally analyzing the stability of the residual coal pillars and the control rock layers in the pillar residual mining area in consider ofthe effects of loading and unloading of the dynamic disturbance, figuring out the result of the feasibility determination for upward mining of pillar residual mining area. According to the feasibilitydetermination method for upward mining of the pillar residual mining area by loading and unloading of the dynamic disturbance, the situation that errors of empirical method are large is avoided, a theoretical basis for safety upward mining of the residual coal in the pillar residual mining area is provided, the recovery rate of the upper coal resource in the pillar residual mining area is improved, and the service life of a mine is effectively increased.

Description

Technical field [0001] The invention belongs to the technical field of coal mining, and specifically relates to a method for judging the feasibility of upward mining in a residual mining area of ​​a knife post with disturbance loading and unloading. Background technique [0002] With the increase of coal mining intensity, coal resources with better mining conditions are gradually decreasing in many mining areas. The remaining coal seams in the upper part of the residual mining area have considerable reserves and good mining value, and their safety mining problems have become increasingly prominent. [0003] The existing judgment methods of upward mining in residual mining areas mainly refer to the judgment methods of caving and upward sequential mining, namely, the ratio judgment method, the "three-zone" judgment method and the surrounding rock balance method. These determination methods are basically carried out around the layer spacing and mining thickness, and the main problems...

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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 remaining coal seam on the remaining coal pillar and interlayer rock formation system in the residual mining area of ​​the knife column, and the disturbance load is to cause the instability of the coal pillar and interlayer rock formation system one of the important factors

[0007] In addition, in the existing mines, the roof of the remaining coal seam in the upper part of the residual mining area has the characteristics of loose, broken and unstable rock formations. When the remaining coal seam is mined, the roof falls with the mining and is re-compacted to almost restore to the original rock stress. However, in some residual mining areas, the roof strata of the remaining coal seams are mainly medium-hard and hard rock formations, and the roofs are not easy to fall when the residual coal seams are mined. Different residual mining areas have different characteristics, and the difficulty of mining cannot be generalized; The relationship between the width of the disturbance load on the upper layer and the suspended span of the interlayer rock between the two layers of coal also affects the safety of coal mining.

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