断层地震动作用下隧道洞口衬砌受力研究  

STUDY ON THE STRESS OF TUNNEL PORTAL LININGS UNDER FAULT RUPTURE SEISMIC LOADING

作　　者：杨朝帅 李达强 郑若泓 YANG Chaoshuai;LI Daqiang;Zheng Ruohong(China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458,China;Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure,Guangzhou 511458,China;China Railway Tunnel Consultants Co.,Ltd.,Guangzhou 511458,China)

机构地区：[1]中铁隧道局集团有限公司,广州511458 [2]广东省隧道结构智能监控与维护企业重点实验室,广州511458 [3]中铁隧道勘察设计研究院有限公司,广州511458

出　　处：《低温建筑技术》2024年第9期86-90,共5页Low Temperature Architecture Technology

摘　　要：近断层地震动对工程结构的地震响应以及失效破坏影响较大,为研究近断层地震动对隧道洞口衬砌地震响应影响,以西部某高速公路隧道为依托,采用扩展有限元技术与动力隐式求解方法,对近断层地震动下隧道洞口衬砌开裂过程进行模拟计算,结果表明在垂直传播剪切地震波作用下,隧道衬砌主要发生底鼓与拱肩向内变形。隧道衬砌拱肩处最先达到抗拉极限发生开裂,拱肩承载比例降低,拱底承载比例上升,随后拱底也达到抗拉极限发生开裂。研究结果可为近断层隧道洞口衬砌合理设计奠定基础。Near-fault seismic motions have a significant impact on the seismic response and failure of engineering structures.To study the effects of near-fault seismic motions on the seismic response of tunnel portal linings,this research uses an experimental highway tunnel in the western region as a case study.The study employs extended finite element technology and dynamic implicit solving methods to simulate the cracking process of tunnel portal linings under near-fault seismic motions.The results indicate that under the action of vertically propagating shear seismic waves,the tunnel lining primarily experiences bottom bulging and inward deformation at the arch shoulders.Cracking first occurs at the arch shoulders where the tensile limit is reached,leading to a reduction in the load-bearing ratio of the arch shoulders and an increase in the load-bearing ratio of the arch bottom.Subsequently,the arch bottom also reaches its tensile limit and experiences cracking.The findings provide a foundation for the rational design of tunnel portal linings under near-fault seismic conditions.

关 键 词：隧道洞口衬砌 近断层地震动 地震响应 衬砌开裂 

分 类 号：TU942[建筑科学—建筑技术科学]