大断面矩形顶管近距离上穿既有地铁隧道的三维数值分析

摘要

以南京市所街地下步行系统建设工程为背景,建立可以考虑基坑分层开挖与顶管分段顶进的三维有限元动态计算模型,模拟了基坑开挖和大断面矩形顶管近距离上穿既有地铁隧道的施工全过程,预测了施工可能引起的隧道及地表变形,并根据预测结果给出了相关工程建议.%Based on the project of underground pedestrian system in Suojie,Nanjing city,3D finite element model is established to simulate the construction process of deep excavation and pipe-jacking perpendicularly crossing the below existed subway tunnel.The deformation of the tunnel and the settlement of the ground induced by construction are predicted and analysed.At last,some suggestions are given basing on the above obtained conclusions.