Surrounding Rock Control Technology of Large Section Chambers in Deep Goaf of Coal Mines
Aiming at the problem that the drainage system chamber needs to be excavated un-der the goaf,this paper takes some production geological conditions of No.2301(upper)working face including the mining layout and excavation system,hydrogeology,and actual water inflow of Jinsheng Yong'an Hongtai Coal Industry as the research background.The arrangement of cham-bers in the large-scale pressure relief area on the floor of the goaf can effectively improve the basic stress environment of the surrounding rock in the chambers.On the analysis of the influence of eliminating or weakening the deep high stress and the rheological properties of rock mass on the continuous large deformation of the surrounding rock and the control problem of the surrounding rock in the large-section chamber under the goaf,we proposed a comprehensive control technolo-gy of strong anchor(cable)support,thick-walled reinforced concrete wall pouring,and full-sec-tion pressure-regulating grouting behind the wall.The results show that the technology realizes the long-term effective control of large section chambers under deep goaf without renovation after support and enriches the theory and technology of surrounding rock control in the deep roadway.
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