摘要
隐伏溶洞通常导致隧道衬砌结构受力特性发生改变,引起变形破坏,威胁隧道运营安全。以某岩溶隧道为研究对象,将隐伏溶洞简化为半径R=3 m的无充填干溶洞,采用Midas|GTS有限元分析软件建立三维有限元数值模型,对不同方位隐伏溶洞下隧道衬砌结构受力特性进行研究,揭示溶洞与隧道距离(以净距S为变量)及溶洞所在方位角β对隧道衬砌结构受力的影响规律,探究隐伏溶洞在不同方位角下的敏感角度α和敏感净距S_(cr)。结果表明:方位角β=90°时,衬砌结构的敏感角度α=90°,敏感净距S_(cr)=6 m;方位角β=45°时,衬砌结构的敏感角度α=35°,敏感净距S_(cr)=3 m;方位角β=0°时,衬砌结构的敏感角度α=0°,敏感净距S_(cr)=3 m;方位角β=315°时,衬砌结构的敏感角度α=297°,敏感净距S_(cr)=5 m;方位角β=270°时,衬砌结构的敏感角度α=297°,敏感净距S_(cr)大于7 m。研究成果可为岩溶隧道施工和营运期检测提供重要的理论指导。
The concealed karst cave usually leads to the change of the stress characteristics of the tunnel lining structure,resulting in deformation and destruction of the tunnel lining structure,and threatening the safety of the tunnel operation.In this study,a karst tunnel is taken as the research object,the concealed karst cave is simplified to an unfilled dry karst cave with a radius R=3 m,and a three-dimensional finite element numerical model is established through Midas|GTS to study the stress characteristics of tunnel lining structure under different azimuth angles of the karst cave.It reveals the influence law of the distance between the karst cave and the tunnel(with the net distance S as the variable)and the azimuth angle β of the karst cave on the stress of tunnel lining structure,and the sensitive angle α and the sensitive net distance S_(cr) at different azimuth angles of the concealed karst cave are explored.The results show that when the azimuth angle β is 90°,45°,0°,315°and 270°respectively,the sensitive angle α of the lining structure is 90°,35°,0°,297°and 297°respectively,and the sensitive net distance S_(cr) is 6 m,3 m,3 m,5 m and larger than 7 m respectively.The research results provide important theoretical guidance for karst tunnel construction and tests in the operation period.
作者
李坤
段志
郭德平
曾彬
王庆
LI Kun;DUAN Zhi;GUO Deping;ZENG Bin;WANG Qing(Sichuan Institute of Building Research,Chengdu 610081;China Highway Engineering Consultants Corporation,Beijing 100089;Xuzhen Railway Co.,Ltd.,Luzhou 646699;The College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074)
出处
《现代隧道技术》
CSCD
北大核心
2023年第S01期74-85,共12页
Modern Tunnelling Technology
基金
重庆市教委科学研究青年项目(KJQN202200719)
重庆市研究生联合培养基地建设项目(JDLHPYJD2020021).
关键词
隐伏溶洞
隧道
衬砌结构
数值模拟
受力特性
Concealed karst caves
Tunnel
Lining structure
Numerical simulation
Stress characteristics
作者简介
李坤(1989-),男,硕士,工程师,主要从事土木工程结构设计与加固等方面的工作,E-mail:372816726@qq.com;通讯作者:郭德平(1983-),男,博士,正高级工程师,主要从事隧道工程等方面的研究工作,E-mail:guodeping99@qq.com.
