A Quantitative Judgment Method for Uplink Mining Feasibility in 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 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 be carried out; S2, obtaining stratum composition, stratum structures and physical and mechanical stratum parameters of a 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 the size of a disturbance load acting on the bottom plate voussoir beam stratum structures; and S5, analyzing whether rotary deformation instability of the bottom plate voussoir beam stratum structures of the composite residual mining area occurs under the action of thedisturbance load, and determining that mining can be carried out if the rotary deformation 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 rotation deformation 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 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 judgm...

AI Technical Summary

Problems solved by technology

[0009] The present invention overcomes the deficiencies in the prior art and provides a method for quantitatively determining the feasibility of upward mining in composite residual mining areas based on the gyration deformation and instability of masonry beam structures under disturbance loads. The conditions for forming a 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

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