（1.同济大学地下建筑与工程系，上海，200092；2.山东大学岩土与结构工程研究中心，济南，250061）
［提要］  建筑密集区的深基坑变形和稳定受多种因素影响，并且与时间和空间效应密切相关。结合上海某建筑密集区深基坑施工的现场监测，对其变形和稳定问题进行了时空效应分析，并指出了影响基坑稳定的一些因素。结合三维数值模拟方法，对基坑开挖过程中的变形规律及时空效应进行了探讨，得到了一些有益的结论，可为类似工程的设计及施工提供借鉴。
［关键词］  深基坑  现场监测  数值模拟  变形  时空效应
Site Monitoring and Timespace Effect Analysis of Deepfoundation Pit Excavation/Zhang Sifeng1, Zhou Jian1, Jia Mincai1,Song Xiuguang2(1 Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2 Research Center of Geomechanics and Structural Engineering, Shandong University, Jinan 250061, China)
Abstract:Deepfoundation pit excavation in dense building block is a complicated mechanics problem, because its deformation and stabilization may be affected by many factors and have close relationship with time and space. Combined with a practical project and based on the site monitoring data, time and space effects of deformation of foundation pit are analyzed, and some factors that can influence the stabilization are put forward. Threedimensional numerical simulation method is adopted, and the laws of deformation and timespace effect during the process of pit excavation are discussed. The conclusions provide a reference for design and construction of similar projects.
Keywords:deepfoundation pit; site monitoring; numerical simulation; deformation; timespace effect