Face-contacted block beam structure compound remnant area upward mining feasibility determination method

Abstract

The invention belongs to the field of coal mining, and provides a face-contacted block beam structure compound remnant area upward mining feasibility determination method. The method comprises the steps of S1, judging an upper portion remnant coal position, and if the upper portion remnant coal position is located above a caving zone of lower coal layer mining, conducting S2, otherwise judging theposition not workable; S2, obtaining the rock stratum composition, rock stratum structure and rock stratum physical and mechanics parameters of a remnant coal mining area through drilling; S3, determining the position of a control rock stratum; S4, calculating the disturbance load of the breaking span and bearing pressure of the control rock stratum after propagation attenuation on a face-contacted block body beam semiarch rock stratum structure of a bottom plate; S5, analyzing whether or not revolution, deformation and unstability occur to the face-contacted block body beam semiarch rock stratum structure of the bottom plate under the effect of the disturbance load, and if not, judging that the area is workable. According to the face-contacted block beam structure compound remnant area upward mining feasibility determination method, the workability judgment accuracy degree and mining safety are improved, the method is applicable to the hard control rock stratum with fracture development, and the condition that the face-contacted block body beam semiarch rock stratum structure is formed.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a method for quantitatively judging the feasibility of upward mining in a composite residual mining area based on the rotational deformation instability of a contact block beam under a disturbance load as a criterion. Background technique [0002] The re-mining of residual coal is a major issue involving the direction of coal development and even national energy security. The residual coal reserves characterized by coal seam groups account for 45% of the total reserves, and upward mining in the residual mining area is an important content of residual coal recovery. [0003] At present, the feasibility study and judgment methods of upward mining in residual mining areas mainly refer to the ratio discrimination method, mathematical statistics method, "three-zone" discrimination method, and surrounding rock balance method for upward mining of coal seam groups. The judgment st...

AI Technical Summary

Problems solved by technology

The technical problem to be solved is that the feasibility method of upward mining in the existing residual mining area cannot be quantitatively determined by empirical methods and does not consider the influence of disturbance loads.

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