Method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars

Abstract

The invention provides a method for determining lower open-off cut positions of shallow-buried short-distance goaf-side coal pillars. According to the method, firstly, drillhole column data near the overlying goaf-side coal pillars corresponding to open-off cuts to be arranged is collected; then, according to the collected data, key layer identifying software is adopted for identifying overlying strata key layer positions under the concrete drillhole column conditions; and finally, according to the occurrence conditions of the key layers between an upper coal bed and a lower coal bed, the lower coal bed open-off cut position determination is carried out according to respective corresponding methods. The method provided by the invention is used for roof plate press frame disaster prevention and control practice during the short-distance coal bed repeated exploitation in a coal mine production process, and has high reliability and practicability.

Description

technical field [0001] The invention belongs to the technical field of underground mining of coal mines, in particular to a method for determining the position of an undercut hole of a goaf coal pillar in a shallow buried near-distance side. Background technique [0002] During the mining of close-distance coal seam groups, due to the large cross-section of the cutting eye and difficult support, the working face of the lower coal seam is usually arranged under the left coal pillar area of ​​the mining of the upper coal seam; thus, the initial mining stage of the working face It will go through the mining process from the overlying coal pillar area to the goaf area, that is, the mining of the goaf coal pillar on the side. image 3 As shown in the figure d m It is the distance from the cut eye in the lower coal seam to the boundary of the goaf coal pillar on the overlying side. On-site mining practice and observation results show that during this process, several working face...

AI Technical Summary

Problems solved by technology

[0004] At present, when the on-site engineers and technicians arrange the cut holes in the shallow buried coal seam at a short distance, they simply design based on whether the support for the cut holes is convenient, and fail to consider the goaf on the overlying side of the subsequent working face. Prevention and control of frame crushing in coal pillars

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