摘要
为探究节理岩体在节理扩展-节理破坏-岩体失稳过程中的力学特性变化及变形破坏规律,采用块体离散元软件3DEC进行数值模拟,对节理岩体中隧道开挖后围岩的应力变形状态进行研究。结果表明:法向刚度较小时,可能造成的塌方范围大,法向刚度较大时,造成的塌方范围小;节理剪切刚度对隧道塌方范围的影响较小;节理内摩擦角变化对断层塌落体及上覆未塌落体范围的影响较小。
In order to explore the mechanical characteristics change and the deformation and failure laws of jointed rock mass in the process of joint propagation-joint failure-rock mass instability,the stress and deformation state of surrounding rock in the jointed rock mass after the excavation of tunnel was studied by numerical simulation with the block discrete element software 3DEC.The results showed that the possible collapse range was large when the normal stiffness was small,and the collapse range was small when the normal stiffness was large.The change of internal friction angle of the joint had little effect on the fault collapsed body and the overlying uncollapsed body.
作者
杨忠民
张玉芳
李健
朱佳华
YANG Zhongmin;ZHANG Yufang;LI Jian;ZHU Jiahua(China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;School of Civil Engineering and Architecture,Henan University,Kaifeng Henan 475004,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2020年第12期143-149,共7页
Journal of Safety Science and Technology
基金
国家重点研发计划项目(2018YFC1504902)
中国铁路总公司科技研究开发计划项目(P2018G001)
中国国家铁路集团有限公司科技研究开发计划项目(N2020G052)。
关键词
软弱岩层
节理参数
隧道塌方
离散元
weak rock formation
joint parameter
tunnel collapse
discrete element
