临近既有地铁隧道新建基坑的数值计算分析
Numerical analysis of the influence of the excavation of excavations upon and beside the existing tunnel

针对上部及侧方位基坑开挖对邻近既有地铁隧道安全运营的影响问题,采用有限元法对深圳地铁11号线站基坑及其风道基坑临近-上跨既有1号线区间隧道的施工关键保护区域进行了三维模拟计算分析,并通过与实测自动化监控数据的对比,验证模拟计算的有效性。基于风道基坑施工中下卧隧道的变形及受力计算结果,获得既有隧道结构在基坑施工过程中的受力特征和变形规律,确定施工中应重点监测的隧道关键部位,施工中采取了针对性保护措施,获得结论对今后类似工程具有参考价值。
In this paper, the finite element software was used to conduct the three-dimensional simulation analysis for the construction of key protection area in Shenzhen Metro Line 11 Chegongmiao station. The excavations are designed upon and beside the No. 1 line interval tunnel. Through comparison with measured automatic monitoring data, the validity of the simulation was verified. By extracting the calculated results of the deformation of tunnel structure caused by construction of air duct, the deformation behavior of existing tunnel structure in this case was understood, and the affected key part of existing tunnels was given. The conclusions will be helpful for proposing the security protection measures in the process of the construction, and can provide beneficial reference for the similar projects in the future