摘要
采用离散单元法,对节理岩体中地下洞室考虑随机节理空间分布的围岩稳定性进行数值分析。分析结果显示不同的节理裂隙分区,块体失稳破坏的位置和深度明显不同;对围岩施加锚喷系统支护后,由于支护结构对围岩的约束作用,围岩变形和破裂深度受到明显抑制,地下洞室实际施工中应根据数值分析所揭露的块体失稳部位和破裂深度提高洞室相应部位支护强度,采取相应工程措施,确保施工期及地下洞室永久安全。随着地下洞室施工,现场揭露的的工程地质信息的进一步充实,完善分析模型,可以较准确的预测洞室围岩块体失稳破坏区域,从而为现场的动态设计及施工提供依据。
Numerical research on the jointed rock mass stability of underground storage cavern considering random joint space distribution is carried out by adopting the distinct element method( DEM). It is showed that the block instability position and fracture depth is different for different joint zones; the rock deformation and fracture depth is apparently decreased by support structure restraint after placing bolt and shotcrete pattern support. Enhancing the support strength and appropriate engineering measures shall be made based on the block instability position and fractured depth revealed by this numerical research in construction site to ensure the underground cavern construction schedule and permanent safety. Following the excavation of undergroud storage cavern and substantial geology information available,the accurate prediction of blocks instability zone can be made by revising the analytical model,consequently,to provide the basis of onsite dynamic design and construction.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第S2期1916-1921,1935,共7页
Chinese Journal of Underground Space and Engineering
关键词
节理岩体
稳定分析
离散单元法
地下洞室
随机节理
jointed rock mass
stability analysis
discrete element method
underground storage cavern
random joints
