利用GDS三轴仪对原状温州饱和软黏土进行5种应力路径下的K0固结三轴不排水试验，分析不同应力路径下土体的应力−应变关系、孔压发展及有效应力路径。利用Skempton公式对常围压下应变与孔压的双曲线关系进行修正，建立不同应力路径下孔压与应变之间统一的表达式。研究结果表明：在不同应力路径下，K0固结软黏土的应力−应变关系和孔压发展均表现出明显的区别。由于不同总应力路径下饱和软黏土孔压的产生抵消了围压的变化值，使有效应力路径基本一致。在本文采用的应力路径下，正常固结黏土p−q−e具有唯一性关系。%Five types of stress path triaxial tests were conducted onK0-consolidated Wenzhou saturated soft clay under undrained conditions by GDS triaxial apparatus. The stress−strain relationship, pore water pressure evolution and effective stress path under different stress paths were discussed. Using Skempton theory, a unified formula between pore pressure and axial strain was established through modifying the hyperbolic relationship under constant confining pressure. The results show that the stress−strain relationship and pore water pressure evolution ofK0 consolidated soft clay are very different under different stress paths. Because the variation of confining pressure is offset by the generation of pore water pressure, the effective stress paths under different stress paths almost coincide, which validates the uniqueness of relationship ofp−q−e.
展开▼
