极弱胶结地层中硐室群围岩稳定性控制技术

Research on Stability Control Technology of Surrounding Rock of Chamber Group in Extremely Week Cementation Stratum

针对五间房西一矿中央变电所这一极弱胶结地层中硐室群的稳定性问题,采用现场测试、数值模拟及现场监测相结合的研究方法,得到硐室群及相邻巷道在多次施工扰动效应下的围岩变形规律和稳定性控制方案,提出了初次支护采用网喷+拱形支架,二次支护采用单层钢筋砌碹混凝土,交叉点处超前支护或临时支护的复合支护方案。现场工业试验表明:硐室群及相邻巷道围岩的稳定性较好,达到了理想的支护效果,对于极软胶结地层条件下大型硐室群的施工具有一定的借鉴价值。

For rock stability of chamber group in extremely week cementation stratum in central substation of west No.1 mine in Wujianfang,with combination of field tests,numerical simulations and site monitoring,the deformation law of surrounding rocks and the stability control program under several construction disturbances in chamber group and its adjacent roadway are obtained.A composite supporting scheme is proposed,that is,the steel mesh/shotcrete＋ arch support is adopted as the first supporting,the concreting supporting scheme with the single layer steel reinforcement is used as the second supporting and advance support or temporary support is at intersection point.The field experiment shows that the stability of chamber group and adjacent roadway is relatively good and such supporting scheme reaches an ideal supporting effect.The scheme provides a certain reference for the construction of chamber groups in the extremely week cementation stratum.