Study on soft soil deformation characteristics and constitutive equations with different contents of graded sand
The deformation characteristics of soft soil with varying sand contents were complex,and the impact of graded sand content on soft soil was more challenging to predict.The triaxial shear failure patterns of soil samples were analyzed through triaxial shear experiments on soft soil with different sand contents.The stress-strain curves of soil samples with varying contents of sand under various confining pressures were obtained and their data change patterns were analyzed.A power-function constitutive model of the stress-strain curve change rate for soft soil with graded sand was proposed.From a novel perspective,the change patterns of plastic hardening parameters and softening parameters of soft soil with different graded sand contents were revealed,and the stress-strain constitutive equation of soft soil that reflects the sand content was derived using the method of finding the original function.It is found that both confining pressure and sand content influence the triaxial shear failure morphology of soil samples.The increase in sand content significantly improves the shear strength of soil samples;for example,the shear strength of soil samples with 40%sand content was increased by 37.38%,14.1%,and 8.86%under different confining pressures(100 kPa,200 kPa,300 kPa),respectively.With the increase of sand content,it is observed that the maximum unloading tangential modulus of the soil sample increases,while the change rate of the tangent modulus of the soil sample decreases.The research findings are providing a new perspective for the in-depth discussion of the influence of graded sand on the deformation characteristics of soft soil.
万方数据
维普
