时空效应理论在软土深基坑施工中的应用  

Application of the Space-Time Effect Theory in the Soft-Soil Foundation Construction

作　　者：刘爱华[1] 黎鸿[1] 罗荣武[1] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《地下空间与工程学报》2010年第3期571-576,594,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家重点基础研究发展规划973项目(2007CB209402)

摘　　要：软土深基坑的土体开挖不仅仅是一项简单的土方工程,它直接关系到基坑工程的安全和建设成本。软土分布广,厚度大,埋藏浅,强度低,给深基坑工程的设计与施工带来很大的难度。为了对开挖引起土中应力场、应变场的变化,特别是流变性较大的软土地层的位移等问题进行深入研究,避免软土深基坑工程施工造成的环境破坏和经济损失,从时空优化角度出发,采用时空效应理论中的分区间、分时段等有效措施控制和减小土体可能产生的最大位移,确保工程安全。工程应用结果表明,该方法能充分考虑因土体开挖导致的基坑位移与工程所处空间位置以及所在的施工时段之间的密切关系,在软土深基坑工程施工上具有良好的应用效果。The construction of soft soil deep foundation is not only related to the soil excavation but also associated with the safety and cost of foundation construction.The soft soil,due to its wide spread and great thickness,shallow burial and low strength,will make the foundation construction more difficult.In order to have further research on the variation of stress field and strain field and especially the displacement problem in soft soil with great rheology due to excavation,and to avoid the environment damage and economic loss caused by soft soil foundation construction,the problems were analyzed from the aspect of time-space optimization,and the sectional and time-interval construction in the theory of space time effect could be the effective measures in controlling and reducing the probable maximum displacement of soil.The results of engineering application show that the relationship between the excavation displacement and the space location of construction as well as construction time can be taken into account using this method,which can be effective in the application of the construction of soft soil foundation.

关 键 词：软土基坑 时空效应理论 实时监测 等效土体水平抗力系数 

分 类 号：TU433[建筑科学—岩土工程]