Knife handle style stope roof space structure model and control method

Abstract

The invention provides a knife handle style stope roof space structure model and a control method. The knife handle style stope roof space structure model mainly comprises a facet stope, a variable-area stope and a large-area stope, and through three developmental stages of a reduced-pressure static mining area, a different-pressure changeable mining area and a pressurized dynamic mining area, corresponding cover rock structures are sequentially transferred and converted to a reduced-pressure structure, a sudden-change structure and a pressurized structure; the coal bed mining of the facet stope is in the reduced-pressure static mining area, and the corresponding cover rock structure is the reduced-pressure structure; the coal bed mining of the variable-area stope is in the different-pressure changeable mining area, and the corresponding cover rock structure is the sudden-change structure; the coal bed mining of the large-area stope is in the pressurized dynamic mining area, and the corresponding cover rock structure is the pressurized structure. The roof control method comprises two basic modes, namely a time mode and a space mode; each mode comprises three main measures; each measure takes corresponding specific key technologies, so that a knife handle style stope roof time-space prevention and control system with multiple mechanisms of 'prevention, control, maintenance and monitoring' is formed.

Description

Technical field [0001] The invention relates to the safe mining field of a knife-handle stope with sudden changes in the slope length of a working face, in particular to a knife-handle stope roof space structure model and a control method. Background technique [0002] With the diversification of coal mining methods and the complexity of the mining environment, the phenomenon of coal seam mining in irregular stopes has increased. The emergence of knife-handle stopes with sudden changes in the slope length of the working face has become a trend. Many mining areas in China have successively appeared such variable-length working faces, such as the Kailuan Coal Mine in Hebei, the Sitai Coal Mine in Datong, and the Shijiazhuang Coal Mine in Lu'an. Gejie Mine, Zhengyang Coal Mine in Jixi, Lingxin Coal Mine in Ningxia, Quantai Coal Mine in Xuzhou, Tangkou Coal Mine in Jining, Pingmei No.1 Mine in Pingdingshan, Panxi Coal Mine in Xinwen, Panxie Mine in Huainan, and Xu in Huaibei Tuan Co...

AI Technical Summary

Problems solved by technology

[0003] The ubiquity of the knife stope has led to the complexity and variability of coal seam mining, causing the intensity of nonlinear fracture of gas-bearing coal and rock mass in deep mining to increase, and the irregularity and dispersion of gas decompression and desorption in broken coal rocks. The unbalanced flow and the irregularity of condensation and enrichment increase the difficulty of mining low permeability, strong adsorption and high gassy coal seams, and put forward higher requirements for the reasonable application of coal and gas co-mining technology

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