Supporting method of super-large section cutting hole of large-mining-height fully mechanized mining face of thin base rock

Abstract

The invention discloses a supporting method of a super-large section cutting hole of a large-mining-height fully mechanized mining face of a thin base rock. The supporting method comprises the following steps: carrying out primary supporting, wherein the primary supporting comprises first branch supporting and second branch supporting, the first branch supporting is supporting a tunnel by utilizing anchor rods and metal meshes after the cutting hole is tunneled primarily, and the second branch supporting is supporting the tunnel by utilizing anchor rods and a plastic mesh after the cutting hole is expanded secondarily; carrying out primary pressure releasing: after the primary supporting is finished, releasing surrounding rock stress at a moment first pre-set time interval before secondary supporting; carrying out the secondary supporting: after the cutting hole is completely molded, supporting by utilizing an arch rope and a high molecular material for the secondary supporting. According to the supporting method disclosed by the invention, the primary supporting is carried out in a tunneling process of a cutting hole tunnel; after the primary pressure releasing is carried out, the secondary supporting is carried out after the cutting hole tunnel is completely molded, and initiative supporting is carried out by phases; the integrity of a surrounding rock with the cutting hole is maintained, and accidents of roof fall and nicking are effectively prevented from occurring.

Description

technical field [0001] The invention relates to the field of mine mining, in particular to a support method for a super-large cross-section cut hole in a fully mechanized mining face with a thin bedrock and a large mining height. Background technique [0002] The Shendong mining area spans the three provinces of Shanxi, Shaanxi and Mongolia. Due to the wide mining area, there are significant differences in the occurrence conditions and surrounding rock characteristics of different coal seams. The thickness of the rock ranges from 5 to 20m. Especially, the outstanding features of the opening of the working face are large cross-section and thin bedrock, which may cause potential safety hazards such as roadway roof caving and even water and sand collapse. The cross-sectional size of the super-large cut hole in the fully mechanized mining face with large mining height must meet the requirements for installing large equipment such as hydraulic supports, shearers, and scraper conv...

AI Technical Summary

Problems solved by technology

[0003] Due to the large thickness of the overlying bedrock on the working face, the large cross-section of the cut hole, and the high pressure on the roof of the cut hole and the two sides, accidents of roof fall and chipping are prone to occur

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