摘要
深圳地铁10号线凉帽山站的三车道隧道是典型的浅埋偏压大跨度隧道。对采用复合式衬砌的暗挖大跨度隧道而言,临时支撑拆除是隧道较为危险的时期。为确定合理的拆撑方案,首先结合工程实际,初步设计3种断面拆撑方案,然后通过二维有限元模拟进行方案的比选,确定最优方案,最后以三维有限元模拟和现场监测两种方法,对优化方案进行验证。结果表明:不同拆撑方案的差别主要体现在顶拱沉降和临时横撑的竖向位移方面;竖撑的拆除时机是影响隧道安全性的主要因素,竖撑最后拆除对隧道安全最为有利;现场监测数据显示,地表沉降、顶拱沉降及水平收敛在拆撑前后变化量均较小,且与数值模拟的结果吻合较好,说明优化方案对隧道安全性的影响较小。
The three-lane tunnel of Liangmaoshan Station of Shenzhen Metro Line 10 is a typical shallow-buried large-span tunnel. For tunnels employing the double-shell lining with large span, temporary support dismantling is a dangerous period. To determine a reasonable temporary support dismantling plan, three kinds of section dismantling schemes are preliminarily designed combined with engineering practice. Then, the comparison of the schemes is conducted by two-dimensional finite element simulation and the optimized one is determined. Finally, the optimized scheme is verified by three-dimensional finite element simulation and in-situ monitoring. The results show that the differences of schemes are mainly reflected in the vault settlement and the vertical displacement of temporary transverse support. The timing of removing vertical support is the main factor affecting the safety of the tunnel. The final removal of the vertical support is most beneficial to the safety of the tunnel. The in-situ monitoring data show that the variations of surface subsidence, vault settlement and horizontal convergence are small before and after support dismantling, and in good agreement with the numerical simulation results, which shows that the optimized scheme has little impact on the safety of the tunnel.
作者
张社荣
曹世伟
王超
龚超
邓淇才
ZHANG Sherong;CAO Shiwei;WANG Chao;GONG Chao;DENG Qicai(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Sinohydro Bureau 14 Corporation,Kunming 650051,China)
出处
《铁道标准设计》
北大核心
2020年第8期80-86,136,共8页
Railway Standard Design
基金
国家自然科学基金创新研究群体科学基金项目(51621092)。
关键词
地铁隧道
支撑拆除
优化分析
数值模拟
现场监测
subway tunnel
temporary supports dismantling
optimization analysis
numerical simulation
in-situ monitoring
作者简介
张社荣(1960-),男,教授,1982年毕业于天津大学,博士,主要从事水工结构及地下工程方面的研究工作,E-mail:tjudam@126.com;通信作者:王超(1986-),男,副教授,博士,E-mail:wangchaosg@tju.edu.cn。
