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为了探讨含盐量及荷载对高含盐饱和细砂土的流变特性的影响,通过对不同含盐率的饱和细砂土在各种荷载等级下进行单轴蠕变试验,开展了对高含盐饱和细砂土的流变特性的试验研究,得到了荷载等级及含盐率对砂土试样流变的影响规律曲线,发现对于相同含盐率的土样,荷载越大,最终变形量越大,变形达到稳定所需时间越长;在固定荷载下含盐率的增加也会使试样的最终变形量增大,且达到变形稳定所需的时间也显著增长。以试验结果为基础并基于黏弹性理论,选择了三单元的H-K模型,其拟合曲线与试验数据基本吻合。最后对该模型进行了参数分析,结果表明:随着荷载的增大,相同含盐率试样的3个流变参数均呈线性增加;当荷载不变时,黏性系数随含盐量的增大而增大,但弹性模量和黏弹性模量却均随之减小。
In order to investigate the effect of salt content and load on the rheological properties of high salt-saturated fine sand, the uniaxial creep tests of saturated fine sand with different salt content under various loading levels were carried out, The experimental study on the rheological properties of salt saturated fine sand soil shows that the influence of load level and salt content on the rheological behavior of sand samples shows that for the same salt content soil samples, The larger the amount of deformation, the longer it takes for the deformation to stabilize. The increase of the salt content under a fixed load also increases the final deformation of the sample and significantly increases the time needed to stabilize the deformation. Based on the experimental results and based on the theory of viscoelasticity, a three-unit H-K model was selected and its fitting curve was in good agreement with the experimental data. Finally, the parameters of the model are analyzed. The results show that with the increase of load, the three rheological parameters of the same salt content increase linearly. When the load is constant, the viscosity coefficient changes with the salt content Increases and increases, but both the elastic modulus and the viscoelastic modulus decrease.