Method for caving large goaf of underground mine and eliminating goaf

Abstract

The invention discloses a method for caving a large goaf of an underground mine and eliminating the goaf. The method comprises the following steps: dividing 2-6 operation areas or explosion areas in a goaf surrounding rock (3) on the periphery of the goaf (1); 3-6 deep hole drilling chambers (9) are arranged in the goaf surrounding rock (3) in each operation area or explosion area, and the deep hole drilling chambers (9) of all layers are communicated through chamber connection wells (10); the method comprises the following steps: arranging a roadway project, namely a connection gate way (6), a connection inclined shaft (7) or a connection raise, between an existing project and a deep hole drilling chamber (9); a caving horizontal deep hole (12) is formed in the deep hole drilling chamber (9) on the middle-lower layer, and a horizontal and upward fan-shaped cutting weakening deep hole (13) is formed in the deep hole drilling chamber (9) on the upper layer. According to the method, the underground engineering amount, the explosive amount of deep hole blasting and the harm caused by air shock waves brought by large-area caving of the goaf are reduced, the construction cost is reduced, and potential safety hazards existing in the large goaf are eliminated.

Description

technical field [0001] The invention belongs to the technical field of goaf treatment in underground mines, and in particular relates to a method for caving treatment of large goafs in underground mines, which is suitable for caving treatment of large goafs in non-coal underground mines by deep hole blasting. Background technique [0002] Goaf governance in underground mining usually adopts four schemes: closed goaf, caving goaf, filling goaf, and support goaf. Among them, the essence of caving surrounding rock to treat the goaf is to fill the goaf with caving surrounding rock, change the stress distribution state of the surrounding rock, and reduce the supporting pressure of the rock. Filling the goaf is a gob treatment method encouraged by the state. It mainly fills the goaf with backfill (tailings, waste rock), and supports the surrounding rock with the backfill, which can slow down or prevent the deformation of the surrounding rock, so as to maintain the its relatively ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a large-scale underground mine for the problems of poor safety conditions for underground operations in large-scale goafs in existing underground mines, major safety hazards, complicated goaf treatment procedures, and high engineering costs for goaf treatment. The method of caving the goaf to deal with and eliminate the goaf

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