以杭州软土地区某紧邻地铁隧道两侧对称开挖深基坑工程为背景,运用三维数值模拟及实测数据剖析等手段,分析了双侧对称开挖基坑对运营地铁区间的影响规律。结果表明：在相同开挖深度的前提下,两侧基坑平面尺寸差异为既有区间水平位移变形的重要影响因素；软土地区基坑拆撑、回筑阶段的变形增量不可忽视,最大占比超过了总变形量的25%；软土地区围护结构及桩基工程的施工对地铁区间影响较为显著。本工程采用的变形控制措施总体保障了邻近地铁的运营安全,为对类似工程的设计及施工提供了参考。

Based on double-side excavation along subway tunnels in soft soil regions in Hangzhou, the analysis of double-side excavation influence patterns on subways in operation is done by three-dimensional simulation and on-site data measurement. The results show that with the same excation depth, the dimentional difference of foundations is one of the important factors to horizontal displacement; The increase of deformation in removal of support and backfill should not be ignored, and the ratio from them is over 25% of total deformation; The constructions of support sturctures and pile foundations have obvious influences on subway; The deformation control techiniques applied in this project guarantees safety of subways near construction, and provide references for similar projects.

U231