正常固结与超固结黏性土的孔压特性

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μ进行归一，证实了超固结黏土的μ/p′e与应力比η可近似成双线性关系．正常固结黏土的μ/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α和应力比η的函数关系与剑桥模型导出的孔压系数α和应力比η的函数关系相比，其变化趋势一致．

Pore pressure characteristics of normal and over-consolidated clays

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.