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作 者:李建华 谢福星 陈凯 荆国业 王永峰 周明 LI Jianhua;XIE Fuxing;CHEN Kai;JING Guoye;WANG Yongfeng;ZHOU Ming(Lijiahao Mine,Shenhua Baotou Energy Co.,Ltd.,Ordos O17000,China;Beijing China Coal Mine Engineering Co.,Ltd.,Beijing 100013,China)
机构地区:[1]神华包头能源有限责任公司李家壕煤矿,内蒙古鄂尔多斯017000 [2]北京中煤矿山工程有限公司,北京100013
出 处:《煤矿安全》2022年第11期212-218,共7页Safety in Coal Mines
基 金:国家能源科技创新资助项目(GJNY-19-112);北京中煤矿山工程有限责任公司科技创新资助项目(KJ-2021-JJZD-10,BMC-ZL-202009)。
摘 要:针对大断面硐室围岩变形破坏严重的难题,以李家壕矿大断面反井施工硐室为研究背景,运用数值模拟、理论分析、现场监测等研究方法,分析了李家壕矿大断面反井施工硐室围岩变形破坏规律,揭示其围岩变形破坏机理,并提出了针对性控制对策。研究表明:大断面硐室顶板岩层为软弱岩层,受开挖扰动影响,顶板围岩破碎,顶板水平与垂直位移显著;大断面硐室空间较大,顶板岩层处于塑性区内,顶板垂直位移为1 450 mm,是常规断面巷道顶板垂直位移的2.8倍;大断面反井施工硐室围岩稳定性控制的关键在于顶板支护。工业性应用监测表明:常规断面硐室顶底板变形量无明显变化,大断面硐室顶板最大下沉值为132 mm,两帮最大移进量为74 mm,底板无明显鼓起现象,围岩变形得到了有效控制。Aiming at the problem of serious deformation and failure of large section chamber surrounding rock, taking the large section reverse shaft construction chamber of Lijiahao Mine as the research background, using the research methods of numerical simulation, theoretical analysis and field monitoring, the deformation and failure law of surrounding rock of large section reverse shaft construction chamber of Lijiahao Mine is analyzed. The deformation and failure mechanism is revealed and the targeted control countermeasures are proposed. The results show that the roof rock of large section chamber is weak rock which is affected by excavation disturbance, the surrounding rock of roof is broken, and the horizontal and vertical displacement of roof are significant;the large section chamber has a large space, the roof rock is in the plastic zone, and the vertical displacement of the roof is 1 450 mm, 2.8 times that of the conventional section roadway;the key to the stability control of surrounding rock in large cross-section raise shaft construction chamber is roof support. The industrial application monitoring shows that the roof and floor deformation of the conventional section chamber has no obvious change, the maximum roof subsidence of the large section chamber is 132 mm, the maximum displacement of the two sides is 74 mm, and the floor has no obvious bulge, which effectively controls the deformation and damage of the surrounding rock.
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