Quantitative determination method of ascending mining feasibility of composite residual mining area

Abstract

The invention belongs to the field of coal mining, and provides a quantitative determination method of ascending mining feasibility of a composite residual mining area. The method comprises the following steps: S1, judging an upper-part residual coal position, carrying out step S2 if the same is located above a caving zone of lower coal seam mining, and otherwise, determining that mining cannot becarried out; S2, obtaining stratum composition, stratum structures and physical and mechanical stratum parameters of the residual coal mining area through drilling; S3, determining positions of control strata forming bottom plate voussoir beam stratum structures; S4, calculating intervals of roofing breaking of the control strata and a disturbance load of abutment pressure acting on the bottom plate voussoir beam stratum structures after propagation attenuation; and S5, analyzing whether sliding instability of the bottom plate voussoir beam stratum structures of the composite residual miningarea occurs under the action of the disturbance load, and determining that mining can be carried out if the sliding instability of the bottom plate voussoir beam stratum structures does not occur. The method improves accuracy of mining admissibility determination and safety of mining, and is suitable for use in conditions that the control strata are hard and the voussoir beam structures are 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 sliding and instability of a masonry 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 method of upward mining in the residual mining area mainly refer to the mathematical statistics method, the "three-zone" discrimination method, and the surrounding rock balance method for the upward mining of coal seam groups. The judgment standard of the ratio di...

AI Technical Summary

Problems solved by technology

[0009] The present invention overcomes the deficiencies in the prior art and provides a method for quantitatively judging the feasibility of upward mining in composite residual mining areas based on the sliding and instability of masonry beam structures under disturbance loads. The condition of the masonry beam structure, the technical problem to be solved is that the feasibility method of upward mining in the existing residual mining area is a problem that cannot be quantitatively determined by empirical methods and does not consider the influence of disturbance loads

Images