Mine pressure control method of intense mine pressure appearance fully mechanized top coal caving face

Abstract

The invention discloses a mine pressure control method of an intense mine pressure appearance fully mechanized top coal caving face, and belongs to the field of roof control of a fully mechanized top coal caving face. The control method mainly comprises the following steps: firstly defining the mine pressure appearance level of the fully mechanized top coal caving face and application conditions for the mine pressure control method, then establishing a caving face 'support-surrounding rock' relation quantitative expression-a roof position state equation according to actually measured mine pressure parameters, so as to provide theoretical support to a mine pressure control technology, ensuring that the support is positioned in a 'limited deformation' operating state depending on the critical operating resistance of the support, so as to realize a restraining method for roof subsidence, and to achieve a mine pressure control minimum goal of guaranteeing normal production during weighting, and finally adopting a method of decreasing the roof subsidence in a roof supporting scheme of adopting gob strip interval coal pile in a mine pressure appearance key region, so as to guarantee the coal pressure control ideal goal during weighting. The method is applied to wide promotion in the intense mine pressure appearance fully mechanized top coal caving face control.

Description

technical field [0001] The invention belongs to the field of roof control of fully-mechanized top-coal caving working faces, and in particular relates to a method for controlling mine pressure at fully-mechanized top-coal caving working faces where strong mine pressure appears. Background technique [0002] The fully mechanized top coal caving mining method is an advanced coal mining method for thick coal seam mining, which has the outstanding advantages of adapting to a wide range of coal seam conditions, high yield and high efficiency. However, during fully mechanized caving mining, the roof control of the working face has become one of the core issues restricting the high production and high efficiency of the working face. Among them, the problem of mine pressure control in the working face with very strong mine pressure is particularly prominent, so it is sought to solve the strong - very strong mine pressure fully mechanized mining The method of mine pressure control pr...

AI Technical Summary

Problems solved by technology

When the working resistance of the hydraulic support cannot balance the mine pressure, the roof of the working face will sink a lot, and the roof control effect will be poor, causing roof accidents, which cannot meet the basic working space requirements of the stope; Post-mining blasting can destroy the integrity of the rock mass and promote and improve roof caving. Pre-mining blasting affects the transportation and maintenance of the two lanes. Post-mining blasting increases the production process of the working face, affecting the normal advancement and safety of the working face. ;Water injection to soften the roof is to drill deep holes into the roof along the special roadway or two lanes of the working face, and inject high-pressure water into the roof through the drilling holes to achieve the purpose of weakening the roof.

[0004] To sum up, at present, a simple, safe and economical (very) strong mine pressure control method for fully mechanized top coal caving face has not been proposed in China

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