软土地铁车站深基坑施工变形监测与分析

Deformation Monitoring and Analysis on Constructing Deep Foundation Pit at Metro Station in Soft Soil Area

基坑变形监测是确保基坑施工安全的必要手段,开展深基坑变形现场监测研究对基坑工程建设具有重要意义。以宁波地铁3号线仇毕站深基坑工程为例,结合岩土工程勘察报告与支护设计方案,对工程区域地表、周边建(构)筑物与地下管线以及工程本身进行监控量测,并根据现场监测结果,对围护结构水平位移、地下连续墙墙顶沉降、地表沉降、管线及房屋沉降、基坑外水位变化、支撑轴力变化情况和发展规律进行了重点分析,得出了宁波软土地区地铁车站深基坑变形的一般规律及受力特征,可为车站基坑变形控制及类似工程的优化设计提供技术支持。

It’s necessary to monitor the foundation pit deformation to ensure the excavation safety, and the research on site monitoring of excavation deformation is of great significance to deep foundation pit construction. Taking the deep excavation of Qiubi Station in Ningbo Metro Line 3 as an example, combined with the geotechnical investigation report and support design scheme, the ground surface, surrounding buildings (structures) , underground pipelines and the project itself were monitored and measured. In addition, based on the field monitoring results, some key points were analyzed emphatically, including the horizontal displacement of enclosure structures, roof settlement of underground diaphragm wall, subsidence of surface, settlement of pipelines and houses, change of water level outside of the pit as well as the law and variation of the support axial force. As a result, the general rules and mechanics characteristics of deep foundation pit deformation were obtained in Ningbo metro station. It could provide technical support for the control of the foundation pit deformation and optimization design of similar projects.