摘要
以邢东矿二水平临时水仓硐室群为工程背景,采用FLAC3D模拟研究硐室群围岩偏应力分布规律及塑性区响应特征,探寻硐室群围岩偏应力分布与硐室群围岩稳定性支护的内在联系。研究结果表明:临时水仓硐室群开挖卸载后,在硐室群围岩中形成环状偏应力峰值区,其环状偏应力峰值区的范围及位置与硐室群围岩塑性区的范围及位置基本一致,且各硐室围岩偏应力峰值区内的高偏应力集中区与各硐室围岩塑性区的扩展区域相同。基于数值模拟试验结果得出,强力锚网索可在各硐室围岩中形成大范围锚杆-索预应力承载结构,并据此提出了该预应力承载结构范围应大于各硐室围岩偏应力峰值区范围的硐室群围岩支护原则。现场实践表明,采用强力锚网索和厚层U型混凝土联合支护,可保障临时水仓硐室群围岩的控制效果,满足其生产服务期间的使用要求。
A numerical study was performed to study the distribution characteristics of the deviatoric stress and the response characteristics of the plastic zone in the surrounding rock of chambers.A FLAC3D was created based on the second level temporary water chamber group of Xingdong Mine to explore the internal relationship between the distribution of deviatoric stress and the stability support of surrounding rock of chamber.The numerical results suggest that after the excavation and unloading of the temporary water storage chamber group,a ring-shaped deviatoric stress peak area is formed in the surrounding rock of the cavern group.The range and location of the ringshaped deviatoric stress peak area are the same as the plastic zone of the surrounding rock of the cavern group.The high deviator stress concentration area in the peak deviator stress region of each chamber surrounding rock is the same as the expansion area of the plastic zone of each chamber surrounding rock.It was found that the strong anchor mesh cables can form a large-scale anchor-cable prestressed bearing structure in the surrounding rock of each chamber.It is suggested that the range of the prestressed bearing structure should be larger than that of the surrounding rock of each chamber.The supporting principle of surrounding rock of chamber group in the range of peak deviator stress.Field practice has shown that the use of strong anchor net cables and thick U-shaped concrete combined support can ensure the control effect of the surrounding rock of the temporary water storage chamber group and meet the use requirements during the production and service period.
作者
潘浩
朱磊
张新福
古文哲
刘治成
李娟
宋天奇
秋丰岐
PAN Hao;ZHU Lei;ZHANG Xinfu;GU Wenzhe;LIU Zhicheng;LI Juan;SONG Tianqi;QIU Fengqi(China Coal Energy Research Institute Co.,Ltd.,Xi'an 710054,China)
出处
《采矿与岩层控制工程学报》
北大核心
2020年第4期51-59,共9页
Journal of Mining and Strata Control Engineering
关键词
硐室群
偏应力峰值区
预应力承载结构
厚层U型混凝土
chamber group
deviatoric stress peak area
prestressed bearing structure
thick U-shaped concrete
