重庆紧临运营地铁隧道深基坑支护设计
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摘要
重庆某紧邻已运营地铁隧道的基坑深达36m,支护安全度要求高,变形控制严格,周边环境复杂。根据周边环境要求结合基坑工程地质条件,分段选用适宜的支护方案,并采用变形控制的设计方法。设计中采用有限元软件ANSYS对基坑支护体系的变形进行模拟分析。数值计算显示基坑最大变形及临近地铁隧道变形均满足相关规范要求,临近地铁隧道基坑支护取得了良好的效果。基坑支护的设计变形控制措施是对紧临地铁站基坑支护工程的探索与尝试,对类似条件下的基坑工程也具有一定的参考价值。
The design of a deep foundation pit supporting project close to a subway tunnel in Chongqing which is complex with high safety requirements and strict deformation control was proposed. According to the surrounding environment requirements combined with the geological conditions of the foundation pit engineering, the appropriate support scheme is selected in sections, and the design method of deformation control is adopted. The numerical simulation was performed by means of the ANSYS software based on the theory of finite element to analyze the deformation of the supporting system during the design stage. The results of the numerical simulation show that the maximum deformation on the top of the supporting structure and the subway tunnel is below the allowable value of the relevant technical code, the foundation pit support close to a subway tunnel has achieved good results. The deformation control measures of foundation pit support design is the exploration and attempt of the foundation pit support engineering close to a subway station. The design of this project can be referenced for foundation pit supporting project under similar conditions.
The design of a deep foundation pit supporting project close to a subway tunnel in Chongqing which is complex with high safety requirements and strict deformation control was proposed. According to the surrounding environment requirements combined with the geological conditions of the foundation pit engineering, the appropriate support scheme is selected in sections, and the design method of deformation control is adopted. The numerical simulation was performed by means of the ANSYS software based on the theory of finite element to analyze the deformation of the supporting system during the design stage. The results of the numerical simulation show that the maximum deformation on the top of the supporting structure and the subway tunnel is below the allowable value of the relevant technical code, the foundation pit support close to a subway tunnel has achieved good results. The deformation control measures of foundation pit support design is the exploration and attempt of the foundation pit support engineering close to a subway station. The design of this project can be referenced for foundation pit supporting project under similar conditions.
引文
[1]闫静雅.邻近运营地铁隧道的深基坑设计施工浅谈[J].岩土工程学报,2010,32(增1):234-237.
[2]VORSTER T E B,KLAR A,SOGA K,et a1.Estimating the effects of tunneling on existing pipelines[J].Journal of Geotechnical and Geo-environmental Engineering,2005,13(11):1399-1410.
[3]SHARMA J S,HEFNY A M,ZHAO J,et al.Effect of large excavation on deformation of adjacent MRT tunnels[J].Tunneling and Underground Space Technology,2001,16(2):93-98.
[4]ZHENG G,WEI S W.Numerical analyses of influence of overlying pit excavation on existing tunnels[J].Journal of Central South University of Technology,2008,15(S2):69-75.
[2]VORSTER T E B,KLAR A,SOGA K,et a1.Estimating the effects of tunneling on existing pipelines[J].Journal of Geotechnical and Geo-environmental Engineering,2005,13(11):1399-1410.
[3]SHARMA J S,HEFNY A M,ZHAO J,et al.Effect of large excavation on deformation of adjacent MRT tunnels[J].Tunneling and Underground Space Technology,2001,16(2):93-98.
[4]ZHENG G,WEI S W.Numerical analyses of influence of overlying pit excavation on existing tunnels[J].Journal of Central South University of Technology,2008,15(S2):69-75.