Advanced pier column pre-arranging gob-side entry retaining method

Abstract

The present invention discloses an advanced pier column pre-arranging gob-side entry retaining method, which comprises: arranging pier columns on the middle portion of a roadway according to row spacing after digging the roadway so as to make both sides of the pier column respectively design the cross-section sizes for the current work surface mining roadway and the next work surface mining roadway; along with the mining performing of the current work surface, retaining the next work surface mining roadway by using the pier columns as the roadway side support bodies; and during the next work surface mining performing process, recovering the pier columns on the rear of the work surface in a one-by-one manner. According to the present invention, the pier columns pre-arranged in the advanced manner are utilized to provide the active cutting-supporting control effect for the gob-side entry retaining top plate, such that the gob-side entry retaining success is ensured while the advantages of roadway side support body construction work safety, no limitation of the roadway side support body construction on the current work surface mining speed, pier column recovering, low cost of the gob-side entry retaining, and the like are provided, and the method is suitable for coal mine mining.

Description

technical field [0001] The invention relates to a method for retaining roadways along gobs by presetting pier columns in advance, which belongs to the field of roadway surrounding rock control. Background technique [0002] As a major branch of coal pillar-free mining technology, gob-side entry retaining technology has self-evident technical and economic advantages, which makes this technology have broad prospects for promotion and application; the original scientific connotation of gob-side entry retaining is in this working face During the mining process, the roadside support body is constructed along the edge of the goaf closely following the working face, and the roadway is preserved as a roadway in the lower working face. Material filling walls, concrete material filling walls, paste material filling walls, concrete blocks, etc.; however, the field application shows that the above-mentioned gob-side entry retaining method has certain disadvantages: (1) Construction of...

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Problems solved by technology

[0002] As a major branch of coal pillar-free mining technology, gob-side entry retaining technology has self-evident technical and economic advantages, which makes this technology have broad prospects for promotion and application; the original scientific connotation of gob-side entry retaining is in this working face During the mining process, the roadside support body is constructed along the edge of the goaf closely following the working face, and the roadway is preserved as a roadway in the lower working face. Material filling walls, concrete material filling walls, paste material filling walls, concrete blocks, etc.; however, the field application shows that the above-mentioned gob-side entry retaining method has certain disadvantages: (1) Construction of roadside support body and working face recovery speed Mutual constraints; (2) The construction of roadside support body is carried out in a narrow space in the goaf behind the end of the working face, and the operation is more dangerous; (3) For roadside support bodies such as dense pillars and gangue bags, There is the problem of small initial support resistance, and for roadside supports such as high-water quick-setting material filling walls, concrete material filling walls, paste material filling walls, and concrete blocks, the filling system is complicated and the cost is high; the above-mentioned shortcomings are undoubtedly It will seriously hinder the popularization and application of gob-side entry retaining technology

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