Judgment method for upward mining feasibility of composite residual mining area based on surface contact block beam structure

Abstract

The invention belongs to the field of coal mining and provides a quantitative judgment method for upward mining feasibility of a composite residual mining area. The method comprises the following steps of S1, judging an upper residual coal position, and if the upper residual coal position is located on a caving zone of lower coal mining, performing the step S2, otherwise, judging that mining cannot be performed; S2, obtaining rock stratum compositions, a rock stratum structure and rock stratum physical mechanics parameters of the residual coal mining area through drilling; S3, determining theposition of a control rock stratum forming a floor surface contact body beam semi-arched rock stratum structure; S4, calculating a disturbance load acting on the floor surface contact body beam semi-arched rock stratum structure after propagation attenuation of a breaking span and a bearing pressure of the control rock stratum; and S5, analyzing whether sliding instability happens to the floor surface contact body beam semi-arched rock stratum structure under the action of the disturbance load or not, and if the sliding instability does not happen, judging that the mining can be performed. Theminability judgment accuracy and the mining safety are improved; and the method is suitable for the situation that the surface contact body beam semi-arched rock stratum structure is formed through hard and fracture development of the control rock stratum.

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 sliding and instability of a contact block beam structure 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 sta...

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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