Driving method of collapsed column in overstress concentration area

Abstract

The invention relates to the technical field of coal mining, in particular to a method for excavating a collapsed column in an overstress concentration area; the method includes the following steps: (1) injecting Mary powder into the broken area of ​​the roof to keep the roof and surrounding rock intact; (2) using "one" The section is excavated by the method of forming the cross section twice. When excavating, the section is divided and formed twice. (3) Install the "iron teeth" on the scraper of the conveyor in the middle of the unit; (4) Support first, then excavate; (5) Strengthen the mine pressure monitoring of the roadway, increase the number of roof separation meters, and set up the surrounding rock observation station; the safe and effective construction method of the present invention effectively ensures the safety of the working face when it passes the collapsed column, and avoids the entire collapse caused by avoiding the collapsed column. The change of the panel layout will reduce the coal recovery rate of the entire panel and reduce the waste of coal resources; the method of passing the collapsed column is simple, effective, economical and scientific, and can be popularized and used in this industry.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a tunneling method for a collapsed column in an overstress concentration area. Background technique [0002] Collapsed pillars are encountered during coal mining. The collapse column is mainly composed of interbeds of coarse sandstone, fine sandstone, gray sandstone and sandy shale, coal and siltstone, which do not contain water and have poor cementation. The collapse column has a great impact on the normal excavation construction. If the tunneling direction is changed by avoiding the collapsed column, the early roadway will inevitably be unusable, causing huge economic losses to the coal mine. At the same time, the panel design scheme must be revised and the roadway layout must be re-arranged, which increases the panel development cost and reduces the coal recovery rate. , the indirect economic loss is huge; in addition, if the collapsed column in the stress concentration a...

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem that the collapsing column in the stress concentration area encountered in the existing coal mining excavation will have a great impact on coal mine mining, destroying the mineable coal seam, reducing coal reserves, reducing mining efficiency, and hindering the use of mechanization. and other technical problems, providing a method for excavating collapsed columns in overstress concentration areas

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