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土体的变形和强度特性取决于土骨架的有效应力状态及其历史,土体中孔隙水压力的精确确定能使我们更好地运用有效应力原理解决基坑等工程实际问题。采用伏斯列夫强度理论中的等效固结应力u/p′_e对三轴试验中的孔压进行归一,证实超固结黏土的孔压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。由这种线性关系推出孔压系数与应力比η的函数关系,与剑桥模型导出的孔压系数相比,可以看出变化趋势是一致的。
Deformation and strength characteristics of soil depend on the effective stress state of soil skeleton and its history. Accurate determination of pore water pressure in soil can make us better use effective stress principle to solve practical engineering problems such as foundation pit. Using the equivalent consolidation stress u / p’_e in the theory of strength of the Fresnel strip to normalize the pore pressure in the triaxial test, it is proved that the pore pressure u / p’_e of the overconsolidated clay can be approximated to the stress ratio η Bilinear relationship. The normalized clay u / P’_e and η can be fitted with a straight line passing through the origin, and the coefficient C is related to the friction angle at failure. The relationship between pore pressure coefficient and stress ratio η is deduced from this linear relationship. Compared with the pore pressure coefficient derived from Cambridge model, we can see that the changing trend is consistent.