基于空间效应的深筒形基坑支护结构变形及稳定性整体分析方法

With the development of water supply and treatment engineering construction, there have been more and more deep slender typed foundation pits which of smaller size in plane but deep excavation depth. The existing design theories and practical analysis methods both in China and abroad are not quite suitable for the designations of such deep slenderer typed foundation pits with strong spatial effects. In this project, nonlinear numerical analyses, laboratory model experiments and case studies would be comprehensively conducted, in order to investigate the mechanism, influential factors and general rules for the spatial effects. On the basis of these works, a method for analysis of the deformation of the entire retaining structure under loadings of additional earth pressures and a series method for stability analysis of the anti-overturning anti-sliding, anti-base upheaval and general failures with a loading under total earth pressures will be proposed. The results of the research project will be not only of important academic values in the design theory of hollow slender typed excavation engineering, but also have a significance in guidance of the excavation design and construction works, and will have practical referential meanings for other typed foundation excavation engineering, and hence of significant effects both in social and economical developments.

随着我国城市供水及水处理工程建设的发展，已经并将继续出现大量的平面尺寸很小而开挖深度较大的深筒形基坑工程。目前国内外的工程设计理论及实用分析方法均难适于这类具有很强空间效应的深筒形基坑的设计，导致设计存在安全风险及经济不合理现象。本项目拟采用非线性数值分析、室内模型试验、工程实测等综合措施，研究深筒形基坑的空间效应的机理、影响因素及规律性。在此基础上，提出基于空间效应的附加土压力作为挡土结构荷载的基坑支护结构整体变形分析方法和以实有土压力为荷载的基坑整体结构抗倾覆、抗滑移、抗隆起及边坡稳定分析方法。研究成果不仅对于深筒形基坑的设计理论有重要的学术价值，也对基坑工程设计与施工有着重要的指导意义，对于其他类型的基坑的设计也有实际参考价值，并具有显著的社会和经济效益。

随着我国城市供水及水处理工程建设的发展，已经并将继续出现大量的平面尺寸很小而开挖深度较大的深筒形基坑工程。目前国内外的工程设计理论及实用分析方法均难适于这类具有很强空间效应的深筒形基坑的设计，导致设计存在安全风险及经济不合理现象。本项目采用非线性数值分析、室内模型试验、工程实测等综合措施，研究了深筒形基坑的空间效应的机理、影响因素及规律性。在此基础上，提出了基于空间效应的附加土压力作为挡土结构荷载的基坑支护结构整体变形分析方法和以实有土压力为荷载的基坑整体结构抗倾覆、抗滑移、抗隆起及边坡稳定分析方法。研究成果不仅对于深筒形基坑的设计理论有重要的学术价值，也对基坑工程设计与施工有着重要的指导意义，对于其他类型的基坑的设计也有实际参考价值，并具有显著的社会和经济效益。