循环应力作用下饱和软黏土的不固结不排水强度与破坏准则

通过循环三轴与循环扭剪试验，研究了饱和软黏土不固结不排水循环强度的变化。结果表明：当循环破坏次数给定后，饱和软黏土的不固结不排水循环强度取决于土单元受到的静剪 （偏） 应力，与其受到的围压无关；当作用在土单元上的静剪 （偏） 应力比从0.3变化至0.6时，饱和软黏土循环强度也逐渐增大。进一步，通过分析循环扭剪试验确定的循环剪切强度与循环三轴试验确定的循环压缩强度之间的关系，阐明了循环应力作用下饱和软黏土不固结不排水强度满足Mises破坏准则。依据本文研究结论，可以通过特定试验建立描述一般应力状态饱和软黏土单元不固结不排水循环强度的变化关系。

Unconsolidated and undrained strength and failure criterion of soft clay under cyclic stresses

The unconsolidated undrained strength of saturated soft clay was studied by cyclic torsion and cyclic triaxial tests.The results show that the unconsolidated undrained cyclic strength depends on the static shear (deviatoric) stress acting on the soil element and is independent of the confining pressure for a specified number of cycles for failure.When static shear stress ratio acting on soil elements increases from 0.3 to 0.6,cyclic strength of the saturated soft clay also increases.It is found that the unc...