摘要
基于有限单元法的Ansys软件,对某隧道盾构施工近距离下穿既有地铁出入口人行通道的施工过程进行数值仿真分析,得出其地层变位规律及对结构内力和变形产生的影响;提出结构安全评价新指标(斜率和曲率)并结合水平位移、竖直位移和差异沉降等指标对车站结构变形的安全性进行了分析,其评估结果与现场监测结果作对比分析,非常吻合。说明该评价指标有效、操作过程可行且结果可信,从而可利用其为类似工程的设计与施工、相关软件计算结果的使用以及结构安全评估提供依据和支持。
A numerical model was established to simulate the safety influence of shield tunneling on its above passages of a metro-station by using FEA-based software Ansys. The deformation of soil mass, structural stress and strain were obtained, and new evaluation indexes （ slope and curvature） were put forward. Then, the influence of such indexes as settlement increments, slope and curvature on the safety of the station was analyzed. The analysis shows that the result obtained by numerical simulation is consistent with the one obtained by field survey, which illustrates that this method is feasible and credible.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2009年第1期172-176,共5页
China Safety Science Journal
基金
华北科技学院科技基金资助(B06014)
北京市教委科技计划重点项目资助(Z07115)
关键词
盾构隧道施工
三维有限元分析
地铁车站
动态施工
地层变位
施工控制
shield tunnel construction
3-dimensional finite element analysis （FEA）
metro station
dynamic construction
heterotaxy
construction control
