中文摘要：

临近地铁隧道的软土深基坑开挖时，若不能严格控制基坑施工效应，既有盾构隧道易出现损坏．在杭州市萧山区彩虹大道（工人路-市心路）B标段深基坑工程开挖过程中，对基坑下穿地铁隧道受影响范围内的隧道位移、收敛等进行监测，同时开展基坑地下连续墙与土体深层水平位移、地下水位、支撑轴力、地表和周边建筑物沉降、基坑围护墙顶与立柱沉降的监测工作．数据分析结果表明：基坑开挖对下穿隧道的影响以竖向位移为主，对水平位移和收敛变形影响较小；地下连续墙深层墙体水平位移与深层土体水平位移有明显的相关性，可用墙体水平位移代替土体水平位移；基坑地下水位的变化趋势与周边建筑物沉降变化趋势相同，开挖期间需密切关注地下水位的变化；基坑隆起是导致支撑轴力出现负值的主要原因，当支撑轴力出现负值时应高度关注坑底隆起和地表下陷．

英文摘要：

The excavation of deep foundation pit near the subway in soft soil, if the influence of construction can not be control strictly, the existing tunnel is prone to damage. By analyzing the monitoring data of an underground deep foundation pit of section B at Caihong Road of Hangzhou, including the displacement and convergence of tunnel within the scope of influence. At the same time horizontal displacement of diaphragm wall and soils, groundwater fluctuation, axial force of bracing, ground and surrounding buildings, settlement , settlement of foundation pit support and columns are monitored. The analytical results indicate that： the vertical displacement is the main changes of tunnel; the horizontal displacement and convergence are the secondary： there is a significant correlation between the horizontal displacement of diaphragm wall and soils; so the horizontal displacement of the diaphragm wall can be used instead of the horizontal displacement of soils; groundwater fluctuation and surrounding buildings settlement have the same change trend; so we should pay more attention to the changes of groundwater fluctuation during excavation; the uplift of foundation pit is a major cause of support axial force in negative, while the axial force is negative we should pay more attention to the uplift and subsidence.