A Supporting Method for Mining Roadway with Broken Surrounding Rock in Goaf of Three-soft Coal Seam

Abstract

The invention discloses a supporting method for a crushed surrounding rock mining roadway in a three-soft coal seam goaf. The method comprises the following steps that the section of the mining roadway in the three-soft coal seam goaf is designed into an arch shape, and the sizes of the gross section and the net section of the roadway are determined; before excavation of the mining roadway in the goaf, a pneumatic drilling machine and a twisted drill stem are adopted for drilling a row of drill holes in the top of the excavated section in a matched mode, and drill rods are driven into the drill holes; and after primary excavation drill rod advance supporting of the mining roadway in the goaf is completed, arch-shaped U36 type steel sheds of four-section structuresare erected, the arch-shaped U36 type steel shedsare connected and fixed throughstraight connecting plates and bent connecting plates, a plastic woven net is adopted for protecting the surface of each steel shed, a joist steel backplate serves as an arch top while wooden backplates serve as arch sides of each steel shed, T-shaped shedseach composed of two cross beams and one column leg which are machined from U36 type steel are adopted for reinforcing supporting, pretightening force of left overlapping joint clamping cables, right overlapping joint clamping cables and top overlapping joint clamping cables of the U36 type steel sheds and cross beam clamping cables of the T-shaped sheds is adjusted, common loading and compatible deformation of the U36 type steel sheds and the T-shaped sheds are achieved, and primary supporting circulation of the excavation mining roadway in the goaf is completed.

Description

technical field [0001] The invention relates to a mining roadway support method, which belongs to the field of underground roadway layout and surrounding rock control in mines, and in particular relates to the technology for controlling surrounding rocks of mining roadways in goafs of three soft coal seams in underground mines. Background technique [0002] With the advancement of mining technology and the reduction of coal resources, the coal pillar-free mining technology is gradually replacing the traditional coal pillar mining technology. It has become a development trend in the goaf where the surrounding rock stress is reduced. However, the surrounding rock of the mining roadway in the goaf is broken, and there are a large number of cracks in some sections that have not been completely filled, resulting in broken surrounding rock in the goaf and poor self-supporting capacity, which brings challenges to the control of the surrounding rock of the mining roadway in the goaf...

AI Technical Summary

Problems solved by technology

[0004] Based on the problem of surrounding rock control in the goaf of the three-soft coal seam gob, the present invention proposes a supporting method for the roadway support of the broken surrounding rock in the goaf of the three-soft coal seam, aiming at solving the problem of the broken surrounding rock of the roadway in the goaf of the three-soft coal seam For the problem of advanced support and joint control, the secondary disturbance of the broken surrounding rock is reduced by performing drill rod advanced support on the broken surrounding rock in the goaf, and then the retractable arched U36 steel shed and retractable T-shaped steel shed are used for the excavation roadway. The U36-shaped steel shed coordinates and controls the surrounding rock of the roadway, and realizes the joint bearing and collaborative deformation of the retractable arched U36-shaped steel shed and the shrinkable T-shaped U36 steel shed, so as to improve the self-support of the surrounding rock. The common strong resistance of the section steel shed realizes the stability of the surrounding rock of the mining roadway in the goaf

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