盾构施工下穿既有建筑物沉降变形分析与控制

Analysis and control of settlement deformation of existing buildings under shield construction

为了控制盾构近接施工区既有建筑物的沉降变形,以福州地铁某线下穿文化街区的隧道盾构施工为例,采取全过程分阶段风险控制措施,并建立其隧道盾构的数值仿真模型,分析盾构施工对建筑物和地表沉降的影响。模拟结果表明:盾构下穿建筑物的最大沉降为4.9 mm,地表最大沉降为5.5 mm,均满足规范要求。同时将数值模拟结果和现场监测结果进行比对,验证了数值模拟的可靠性。研究结果可为类似隧道盾构下穿既有建筑物的风险管理和控制提供参考。

In order to control the settlement deformation of existing buildings near the shield construction area,taking the shield construction of a subway line underneath the cultural block in Fuzhou as an example,the whole process of phased risk control measures is taken,and the numerical simulation model of the tunnel shield is established to analyze the impact of shield construction on the settlement of buildings and surfaces.The simulation results show that under the shield construction the maximum settlement of the buildings is 4.9 mm and the maximum settlement of the surfaces is 5.5 mm,all of which meet the requirements of the specification.Meanwhile,the reliability of numerical simulation is verified by comparing the numerical simulation results with the on-site monitoring results.The results can provide reference for risk management and control of existing buildings under similar tunnel shield constructions.