关键词: 饱和分散性土, 变形特性, 单向压缩试验, 幂函数, 本构模型

Abstract: Dispersive clay is of low erosion resistance and impermeability,and severely endangers the safety of water conservancy construction as it has high dispersion in low salinity water.At present,research of dispersive clay mainly focuses on the identification,impermeability and modification;however,studies on the deformation properties are rare.In this paper,the deformation behavior of saturated dispersive clay under different degrees of compaction was studied through uniaxial compression tests.The test results show that the deformation of dispersive clay depends not only on the stresses exerted on them but also the time elapsed,and has obvious nonlinear characteristics.The results also indicate that the degree of compaction has significant effect on the deformation of saturated dispersive clay.According to the test results,the stress-strain and strain-time curves of saturated dispersive clay can be expressed with the power function.The loading constitutive model and creep constitutive model were established,and the comparison between model predicted result and measured result indicates that the predicted result using the model are in reasonable agreement with the test data.

Key words: saturated dispersive clay, deformation properties, uniaxial compression tests, power function, constitutive model