Method for gob side entry retaining in top-cutting pressure relief roadway in U-shaped steel support roadway

Abstract

The invention discloses a method for gob side entry retaining in a top-cutting pressure relief roadway in a U-shaped steel support roadway. An arc-shaped backstopping roadway supported by a U-shaped steel frame is adopted for tunneling along the bottom of a thick coal layer with unstable storage, a rock stratum with a stable soft rock stratum or a coal layer is above the arc-shaped backstopping roadway, a joint support technology of 'a U-shaped steel shed, an anchor net cable, an anchor cable joist, a pi-shaped beam and a single hydraulic support column' is adopted, a U-shaped steel shed top beam is reinforced on an advance surface coal wall, dense top-cutting pressure relief drilling and net hanging are conducted, and a top-cutting anchor cable is arranged; shed legs, close to an upper band, of the U-shaped steel shed are removed, an anchor rod is arranged to close the band, and operations such as advance support and the like are conducted on the roadway through the joint support technology. The method has the advantages of low cost and convenient construction, greatly improves the stability of the U-shaped steel support roadway, has high safety, effectively solves the problem that the gob side entry retaining is conducted in the U-shaped steel support arched roadway, and has good social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of roadway support, in particular to a method for retaining a roadway along the gob in a U-shaped steel supported roadway for roof cutting and pressure relief. Background technique [0002] As a coal mining technology, gob-side entry retention can improve roadway maintenance, reduce roadway excavation, ease excavation replacement, and achieve safe production in high-gas working faces and efficient production without coal pillars. The preliminary support of the mining roadway is an important part of the success of the entire gob-side retaining roadway. Under normal circumstances, the mining roadway is excavated along the roof or along the floor, and its cross-sectional shape is rectangular or trapezoidal. However, in the mining roadway arranged along the floor, when the strength of the coal seam is low, or when a fault or geological structure is encountered, the surrounding rock is relatively broken, and the...

AI Technical Summary

Problems solved by technology

However, in the mining roadway arranged along the floor, when the strength of the coal seam is low, or when a fault or geological structure is encountered, the surrounding rock is relatively broken, and the active support of the anchor net cable is difficult to use. In order to facilitate the roadway support, the roadway usually uses U-shaped steel brackets for passive support. Therefore, there is a lower-strength top-coal or pseudo-roof rock formation above the roadway

At present, for mining roadways with rectangular or trapezoidal cross-sections, there are corresponding gob-side entry retention methods, but there is a lack of methods for using U-shaped steel brackets to support gob-side entry retention in mining roadways

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