Overburden bed separation sectional isolation grouting-and-bashing coal seam mining complete stoping method

Abstract

The invention belongs to the field of coal mining, and particularly relates to an overburden bed separation sectional isolation grouting-and-bashing coal seam mining complete stoping method. The overburden bed separation sectional isolation grouting-and-bashing coal seam mining complete stoping method comprises the following steps that 1, according to geological prospecting data, an overburden keystrata of a stope is determined; 2, the inclination length of a stope face is designed reasonably according to the actual coal seam occurrence range and the reserve volume of a mine, and it is ensured that breaking of the overburden main key strata cannot be caused due to the fact that mining is conducted under the length; 3, a coal pillar with the length of a working face is arranged between twosections in a spaced mode, namely one section is spaced, sectional jump mining is conducted, and the sections on the two sides of the coal pillar are mined firstly; 4, pushing mining is conducted onthe working faces of the two sections, meanwhile, parallel working is conducted, the coal pillar is not reserved, a preset bashing belt is built in a crossheading, close to one side of the coal pillar, of the working face of the coal pillar along the coal wall; and 5, stoping work of the middle section is conducted. According to the overburden bed separation sectional isolation grouting-and-bashing coal seam mining complete stoping method, roadway driving maintenance and the working face working environment are safer and healthier.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a method for recovering all coal seams by isolation, grouting, filling and mining of overburden and separation layers. Background technique [0002] Filling mining is a fundamental measure to solve ground subsidence. The principle is that the filling material interacts and influences the "self-organization" process of the post-mining mobile rock stratum to reach a new balance point, form a new rock mass, support the overlying rock mass, and control ground subsidence. Obviously, the effect of filling and subsidence reduction is determined by the compactness of the new rock mass after filling. The denser the new rock mass, the smaller the voids and fissure spaces in the goaf, the more stable the rock mass, and the lower the possibility of potential subsidence. [0003] Studies have shown that if coal pillars are left (but not combined with filling) for mining, and the coal p...

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Problems solved by technology

Thereby providing a method for recovering all coal seams in the mining of ov

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