正常固结与超固结黏性土的孔压特性  

Pore pressure characteristics of normal and over-consolidated clays

作　　者：徐舜华[1] 程瑶[2] 

机构地区：[1]天津大学仁爱学院,天津301636 [2]中国地质大学工程学院,湖北武汉430074

出　　处：《交通科学与工程》2011年第2期6-10,22,共6页Journal of Transport Science and Engineering

摘　　要：采用伏斯列夫强度理论中的等效固结应力p′e对三轴试验中的孔压u进行归一,证实了超固结黏土的u/p′e与应力比η可近似成双线性关系.正常固结黏土的u/p′e与应力比η能用通过原点的直线拟合,其系数C与破坏时的摩擦角有关.由该线性关系推出的孔压系数a和应力比η的函数关系与剑桥模型导出的孔压系数a和应力比η的函数关系相比,其变化趋势一致.The pore pressure u in undrained triaxial compression tests was normalized with equivalent consolidation pressure p′e of the Hvorslev Strength Theory. A bi-linear relationship between μ/p′e and stress ratio r/was validated for isotropical over-consolidated clays. A linear relationship passing through the origin of coordinates between μ/p′e and r/was fitted well for the normally consolidated clays. The coefficient C is related with the friction angle in failure. The formulation of the pore pressure coefficient was deduced by the use of the linear relationship. The predicted pore pressure coefficients varying with r/agree well with those predicted by the pore pressure formulation deduced from the Cam-clay Model.

关 键 词：等效固结压力 伏斯列夫强度 孔压 正常固结 超固结 

分 类 号：TU441.8[建筑科学—岩土工程]