A Method for Discriminating the Feasibility of Mid-seam Abandoned Coal Mining in Composite Knife Column Residual Mining Area

Abstract

The invention discloses a method for determining exploitation feasibility of middle-layer abandoned coal in a composite pillar type ascending mining area. The method comprises the steps of firstly performing unified dividing and numbering on composition of the middle-layer abandoned coal, an upper interlayer rock stratum and a lower interlayer rock stratum; respectively determining positions of a middle-layer abandoned coal upper control layer and a lower bearing layer, analyzing exploitation possibility of the middle-layer abandoned coal in the composite pillar type ascending mining area through comparing roofing breaking intervals of the two layers and magnitude of a vertical pillar ascending mining area suspended span, and finally sufficiently considering effect of middle-layer abandoned coal exploitation to superposed roofing breaking intervals of the upper control layer and the lower bearing layer, thereby finishing the method for determining exploitation feasibility of the middle-layer abandoned coal in the composite pillar type ascending mining area. The method has advantages of scientifically evaluating feasibility of safe exploitation on the middle-layer abandoned coal under the influence of vertical pillar multiple exploitation factors, further supplying theoretical basis for mine pressure control technology selection and safety measurement utilization in the exploitation process of the middle-layer abandoned coal, and realizing safe exploitation of the middle-layered abandoned coal in the composite pillar type ascending mining area.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for discriminating the feasibility of mid-layer abandoned coal mining in a composite knife column residual mining area, which is mainly suitable for evaluating the feasibility of mid-layer abandoned coal mining under the influence of upper and lower column multiple mining operations. Background technique [0002] Due to technical and economic constraints, in order to pursue short-term interests, many coal mines in my country have encountered phenomena such as mining thick and discarding thin coal resources, mining fat and discarding thin coal, mining good and discarding inferior, mining easy and discarding difficult, etc., resulting in many thin and thin , Abandonment of low-quality and difficult-to-mining coal seams. At present, there are about 40 billion tons of abandoned coal resources incompletely counted nationwide, and as many as 10 billion tons in Shanxi alone,...

AI Technical Summary

Problems solved by technology

The aforementioned evaluation methods mainly evaluate the feasibility of the mining of the overlying hollow coal seam in the knife-pillar residual mining area, and pay little attention to the identification of the feasibility of the mid-layer abandoned coal mining in the composite knife-pillar residual mining area

Images