(1.华东建筑设计研究院有限公司,上海,200002;2.上海交通大学土木工程系,200030)
［提要］  基于深基坑工程实践提出了基坑支护结构计算的三维“m”法，建立用于分析支护结构的空间效应的三维计算模型。提出了模拟目前工程中常用的分区开挖与盆式开挖的方法和相应的被动区土体基床系数的计算公式，同时将坑内被动区土体基床系数的比例系数(m值)表示为时间的函数来反映深基坑工程的时间效应。方法在上海南站北广场及其相关工程中得到了应用，效果较好，表明考虑时空效应计算方法合理实用。
［关键词］  深基坑工程  时空效应  三维“m法  盆式开挖  分区开挖  空间效应  时间效应
Research on Calculation Method Considering Timespace Effect in Deep Excavation Projects/Shen Jian1， Wang Weidong1， Wang Jianhua2(1 East China Architecture Design & Research Institute Co.,Ltd., Shanghai 200002, China; 2 Shanghai Jiaotong University, Shanghai 200230, China)
Abstract:Based on engineering practice, the 3D “m” method of retaining structure in deep excavations is put forward. The 3D calculation model of retaining structure is used to analyze the space effect of retaining structures, and the formula of k h value in passive area, when using 3D “m” method to simulate sub area excavation and basin excavation which are two common construction methods in practical projects, is also introduced. The “m” value of soil is expressed as a function of time to reflect the time effect of deep excavation projects. Good effect is acquired through the application of this method in the project of north square on Shanghai south railway station and other relevant projects, and it is indicated that the calculation method is rational and practical.
Keywords:deep excavation projects; timespace effect; 3D “m” method; sub area; basin
*上海市科委重点攻关项目:深层地下结构开发关键技术研究(052112010)。