软土地区地铁区间两侧深基坑 对称开挖影响分析

以杭州软土地区某紧邻地铁区间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 尺寸差异为既有地铁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%；软土地区深基坑工程围护结构及桩基工程施工对邻近地铁区间影响较为显著。 本工程采用分区对称开挖，加强围护体系刚度等变形控制措施总体保障了邻近地铁的运营安全，为类似工程的设 计及施工提供参考。

Influence of Adjacent Subway Tunnel on Deformation due to Bilateral Deep Excavations in Soft-soil Area

This paper analyzes the influence patterns of double-side excavation on operating subways in soft soil regions in Hangzhou, employing three-dimensional simulation and on-site data measurement. The analysis reveals that the dimensional difference in foundations significantly contributes to horizontal displacement when the excavation depth is constant. In addition, the increase in deformation during the removal of support and backfill is noteworthy, accounting for over 25% of the total deformation. The construction of support structures and pile foundations also notably impacts the subway. The deformation control techniques used in this project ensured the safety of nearby subways during construction. These findings offer valuable insights and practical references for similar future projects.