中文摘要：

为指导盾构施工方案的决策，选取合理的施工参数和必要的加固措施，研究了盾构施工对邻近建筑物的影响．以深圳地铁2#线某区间隧道为背景，采用FLAC3D有限差分软件，对不同地质条件盾构下穿建筑物进行模拟，研究建筑物沉降、变形特征．根据现场监测数据总结出盾构施工对邻近建筑物的影响规律，分析地质条件、基础类型等因素与建筑物变形的关系．研究表明，隧道左、右线分别通过建筑物时其基础的沉降值迅速增加，有明显的二次沉降规律；隧道两线与建筑物平面位置关系决定其对建筑物二次扰动的程度，正下方穿越比侧穿对建筑物的影响要大；盾构断面为软弱岩时引起的建筑物沉降较大，为硬岩时沉降显著减小．

英文摘要：

Several construction decisions, including reasonable construction plan, tunneling parameters and building reinforcement measures, may be made by analyzing and evaluating building settlements induced by shield tunneling in close proximity. Based on a project of No. 2 line of Shenzhen subway, characteristic settlements of the buildings were simulated and analyzed with software of FLAC 3D. The characteristic settlements of the buildings were also investigated by in-situ monitoring, and the effects of geology conditions and foundation types on the settlements were simultaneously studied. Results show that the settlements will increase rapidly when one tunnel is being tunneled under the buildings by the shield machine and there will be an obviously secondary settlement when the other parallel tunnel being tunneled; the secondary settlements will be also affected by the location relation between the tunnels and the building foundations ; and the settlements will be much larger when the tunnel section consists of weak rock than they will be when the tunnel section consists of hard rock.