浅埋偏压隧道冒顶塌方的二次破坏风险仿真分析  

Simulation Analysis of Secondary Failure Risk of Roof Fall and Collapse in Shallow-buried Eccentric Pressure Tunnel

作　　者：杨绪祥 YANG Xuxiang(Yunnan Research Institute of Highway Science and Technology,Kunming 650051,China)

机构地区：[1]云南省公路科学技术研究院,昆明650051

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第4期747-751,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：云南省交通运输厅科技项目(2022-23-1)。

摘　　要：文中提出浅埋偏压隧道冒顶塌方的二次破坏风险仿真分析方法.该方法以某浅埋偏压型隧道为研究对象,依据隧道围岩和支护物理参数使用有限元模拟软件构建隧道冒顶塌方二次破坏风险仿真模型.对隧道冒顶塌方二次破坏风险仿真模型进行网格划分,整合隧道不同空间位置质量参数.利用仿真模型计算二次破坏风险相关性系数,依据该系数判断二次破坏风险.结果表明:该方法计算出的隧道冒顶塌方二次破坏风险相关系数数值与实际值完全吻合,验证了模型的可靠性.浅埋偏压隧道挖掘时的渗透体积荷载取值越大,其内部变形越显著,塑性区分布范围越广,此时隧道围岩变形严重坚固程度差,冒顶塌方二次破坏风险较高.A simulation analysis method of secondary damage risk of roof collapse in shallow-buried unsymmetrical pressure tunnel was proposed.This method took a shallow-buried unsymmetrical tunnel as the research object,and used finite element simulation software to build a simulation model of secondary damage risk of tunnel roof fall and collapse according to tunnel surrounding rock and supporting physical parameters.The simulation model of secondary damage risk of tunnel roof collapse was meshed and the quality parameters of different spatial positions of the tunnel were integrated.The correlation coefficient of secondary damage risk was calculated by simulation model,and the secondary damage risk was judged according to this coefficient.The results show that the numerical value of the correlation coefficient of secondary damage risk of tunnel roof fall calculated by this method is completely consistent with the actual value,which verifies the reliability of the model.The greater the seepage volume load during excavation of shallow-buried unsymmetrical pressure tunnel,the more obvious its internal deformation and the wider the distribution range of plastic zone.At this time,the surrounding rock of tunnel is severely deformed and the degree of firmness is poor,and the risk of secondary failure of roof caving is higher.

关 键 词：浅埋偏压隧道 冒顶塌方 二次破坏风险 相关系数 隧道拱顶 偏移数值 

分 类 号：U455[建筑科学—桥梁与隧道工程]