跨越运营地铁隧道超大基坑开挖的土体参数反分析
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摘要
针对跨越运营地铁隧道的超大面积深基坑建立了大型三维有限元模型,并对基坑开挖引起的周边环境和隧道变形进行分析.根据工程的重要性和信息化施工的需要,利用施工过程的变形监测数据,使用单纯形法对其土体参数进行了反分析.根据编制的单纯形反分析程序和有限元方法计算得到了相关的土体参数,并预测了基坑开挖最终引起的隧道隆起量.结果表明,计算所得隧道隆起预测结果与实际监测数据较为接近.
The three dimensional finite element model was built up to simulate an over size and deep excavation traversing shield tunnels,and the effects on surroundings and tunnel heave due to excavation were analyzed.From monitored retaining wall horizontal displacements and tunnel heave,a simplex method was employed for back-analysis of soil parameters.According to the back-analysis program based on simplex method,optimized soil parameters were attained after finite element analysis.The final tunnel heave was predicted by the optimized soil parameters.The results show that the predicted tunnel heave is close to monitored data,which guarantees the effectiveness of back analysis by this paper.
The three dimensional finite element model was built up to simulate an over size and deep excavation traversing shield tunnels,and the effects on surroundings and tunnel heave due to excavation were analyzed.From monitored retaining wall horizontal displacements and tunnel heave,a simplex method was employed for back-analysis of soil parameters.According to the back-analysis program based on simplex method,optimized soil parameters were attained after finite element analysis.The final tunnel heave was predicted by the optimized soil parameters.The results show that the predicted tunnel heave is close to monitored data,which guarantees the effectiveness of back analysis by this paper.
引文
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[2]Hu Z F,Yue Z Q,Zhou J,et al.Design andconstruction of a deep excavationin soft soils adjacentto the Shanghai Metro tunnels[J].CanadianGeotechnical Journal,2003,40(5):933-948.
[3]王卫东,沈健,翁其平,等.基坑工程对邻近地铁隧道影响的分析与对策[J].岩土工程学报,2006,28(S1):340-1345.WANG Wei-dong,SHEN Jian,WENG Qi-ping,et al.Analysis and countermeasures of influence ofexcavation on adjacent tunnels[J].Chinese Journal ofGeotechnical Engineering,2006,28(S1):1340-1345.
[4]李志高,刘国彬,曾远,等.基坑开挖引起下方隧道的变形控制[J].地下空间与工程学报,2006,2(3):430-433.LI Zhi-gao,LI U Guo-bin,ZENG Yuan,et al.Con-trol measures of tunnel displacement by over-excava-tion unloading[J].Chinese Journal of UndergroundSpace and Engineering,2006,2(3):430-433.
[5]DG/TJ08-61—2010,上海市基坑工程技术规范[S],2010.
[6]JGJ 120—99,建筑基坑支护技术规程[S],1999.
[7]王建华,徐中华.支护结构与主体地下结构相结合的深基坑工程研究现状[J].南昌工程学院学报,2007,26(1):1-12.WANGJian-hua,XUZhong-hua.State of deep exca-vations supported with permanent structure[J].Journal of Nanchang Institute of technology,2007,26(1):1-12.
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[9]杨志法,王思敬,冯紫良,等.岩土工程反分析原理及应用[M].北京:地震出版社,2002.
[10]徐士良.C常用算法程序集[M].北京:清华大学出版社,1994.
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