Governance method of floor heave of mine roadway during mining

Abstract

The invention relates to a governance method of a floor heave of a mine roadway in a mine during mining. In a length range affected by mining in front of a mining working face, a pillar bottom beam structure comprising longitudinal channel beams and transversal channel beams is mounted at a backstopping roadway soleplate, single hydraulic posts are mounted between the bottom beam structure and a top plate to transfer the pressure of the top plate to the soleplate through the single hydraulic posts, and the high supporting resistance of the single hydraulic posts is utilized to control the floor heave. The method has high supporting strength, simple and convenient operation and little influence on production and therefore is an effective governance method of the floor heave of the mine roadway during mining.

Description

technical field [0001] The invention relates to a support project for a coal mining roadway under a mine, in particular to a method for controlling the bottom heave of the roadway during mining. Background technique [0002] In the process of coal seam recovery, with the continuous advancement of the working face, the surrounding rock stress redistributes and shows strong deformation within the range of about 60m to 100m in front of it, which leads to the reduction of the roadway section and affects the working face. Safe and efficient production. A large number of on-site measured data show that the deformation of the roadway during this period is dominated by the approach of the roof and floor, and the amount of bottom drum accounts for more than 60% to 70% of the approach of the roof and floor. If the gob-side retaining technology is implemented, the roadway will also be strongly affected by the roof activity above the goaf, and the bottom heave will further increase. T...

AI Technical Summary

Problems solved by technology

The results of field engineering practice and a large number of literature searches show that at present, most mining roadways adopt the method of letting the bottom drum during the mining period and passively lifting the bottom later, which not only wastes man-hours, but also affects the normal use of the roadway and delays production.

The existing floor grouting and floor bolt (cable) support technologies that actively control the floor drum are also difficult to implement due to the immaturity and high cost of floor construction equipment, and only stay at the conceptual stage

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