考虑黏性土应变局部化的深基坑设计研究  

Design of deep foundation pits considering strain localization of clay

作　　者：张恒[1] 袁聚云[1] 董建国[1] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2008年第S1期198-202,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(10372018)

摘　　要：实际工程在进行设计时,已经满足规范要求并还有一定的安全储备,但深基坑失稳和高路堤滑坡等重大事故还是时有出现,这主要是对土体应变局部化现象考虑的不够所致。为尽可能减少工程事故,根据平面应变不排水试验结果,考虑土体应变局部化的影响,将土体应变局部化过程中剪切带开始形成时的强度指标应用于基坑设计中。通过对上海市重点工程——外滩通道工程中典型基坑位置进行设计计算,表明考虑土体应变局部化能够更好的保证基坑的安全性要求。When practical projects are designed,the norms have been satisfied and certain security reserve has been kept,but the damage of deep foundation pits and high embankments has occurred occasionally.The reason lies in that the researches on localization are not enough.In order to reduce the accidence of projects,based on the influence of localization according to the results of plane strain tests,the strength index was employed in the design of foundation pits.Through the design and calculation of the typical position of the foundation pit of Waitan tunnel in Shanghai,the results show that considering the strain localization of clay can satisfy the security of foundation pits.

关 键 词：基坑 平面应变 应变局部化 强度指标 

分 类 号：TU473.2[建筑科学—结构工程]