摘要
为解决深部泵房硐室群失稳现象突出的问题,以大强煤矿-890水平泵房吸水井硐室群为工程背景,通过理论分析和数值模拟,分析硐室群的破坏原因,对比集约化设计和传统设计对围岩稳定性控制的效果.基于恒阻大变形(NPR)锚索高恒阻、高延伸率和吸能的特性,建立NPR锚索支护下硐室交岔口围岩能量失稳判据,提出以高预应力NPR锚索+立体桁架为核心的泵房吸水井集约化控制对策,并进行现场应用.结果表明:相比传统设计,集约化设计简化了硐室布局和施工程序,同时能够减小巷道位移、应力,使塑性区范围减小并趋于均匀化,消除了空间效应;通过NPR锚索的高恒阻大变形和在桁架与围岩间预留的间隙释放围岩变形能,通过NPR锚索的高预应力和立体桁架的强度限制围岩变形,能有效保证巷道稳定;现场应用表明,该对策将围岩变形控制在70 mm以内,应用效果良好,可为类似工程提供参考.
Deep rock mass is in a complex mechanical environment characterized by high ground stress,high ground temperature,high karst water pressure,and strong mining disturbance,resulting in difficult support and high levels of failure in the pump chamber group.To solve the problem of the instability of the deep pump chamber group,this paper takes the-890-level pump absorbing well chamber group of the Daqiang coal mine as the engineering background.Through theoretical analysis,numerical simulation,and field tests,the reasons for the failure of the chamber group are analyzed,and the effects of intensive design and traditional design on the stability control of the surrounding rock are compared.According to the characteristics of high constant resistance,high elongation,and energy absorption of the negative Poisson’s ratio(NPR)cable,the instability energy criterion of intersection under the NPR cable support is established,where the chamber is stable at KN≤1.The intensive control strategy of the pump absorbing well with a high prestressed NPR cable and three-dimensional truss as the core is presented and applied in the field.The results show that high ground stress,low surrounding rock strength,dense chamber group distribution,unreasonable excavation sequence of the chamber group,and inappropriate support are the main reasons for the failure of the deep pump absorbing well chamber group.Compared with the traditional design,the intensive design simplifies the layout and construction procedure of the chamber by considering the absorbing well,improves the stress conditions of the chamber,reduces the displacement and stress of the roadway,makes the plastic zone range smaller and more uniform,and eliminates the spatial effect.The deformation energy of the surrounding rock is released through the high constant resistance and large deformation of the NPR cable and the reserved gap between the truss and the surrounding rock,and the deformation of the surrounding rock is limited through the application of high prestress to the
作者
孙晓明
朱明群
张勇
徐爱国
崔力
缪澄宇
赵成伟
张尚坤
SUN Xiaoming;ZHU Mingqun;ZHANG Yong;XU Aiguo;CUI Li;MIAO Chengyu;ZHAO Chengwei;ZHANG Shangkun(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Tiefa Coal Industry Group Daqiang Coal Mine Co.LTD,Shenyang 110500,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2023年第10期1693-1703,共11页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51874311,51904306)
中央高校基本科研业务费专项资金资助项目(2022YJSSB03)。
