关于固结系数的一点讨论  

Some Discussions on the Coefficient of Consolidation

作　　者：周健[1] 问延煦[1] 李洋溢[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《工程勘察》2006年第9期12-15,共4页Geotechnical Investigation & Surveying

摘　　要：目前的堆载预压工程设计中,通常假定软土的固结系数在加载过程中为常数。本文从实际工程出发,利用现场实测的孔压资料,以砂井固结理论和太沙基一维固结理论为基础,反演得出Ch、Cv随有效应力变化关系图,发现Ch、Cv在超过初始有效应力的某一压力值附近有较大的变化,由此认为软土的固结系数在加载过程中不宜视为常数,并且进一步探讨了固结系数陡变的原因。The coefficient of consolidation is usually treated as a constant during the loading in the current design of preloading method. Based on sand drain consolidation and one-dimensional consolidation theory, the relationship between Ch, Cv and effective stress is provided by the back analysis of the in-situ pore water pressure monitoring data of a real construction site. A phenomenon is observed that Ch , Cv have a relatively large variation when effective stress surpasses a certain value. Then, it is suggested that the coefficient of consolidation should not be treated as a constant under the loading, Finally, the possible cause of the relatively large variation is also discussed.

关 键 词：固结系数 有效应力 现场孔压观测 反演 

分 类 号：TU435[建筑科学—岩土工程]