高含盐饱和细砂土的蠕变特性

发布时间：2018-06-13 23:50

本文选题：道路工程 + 高含盐细砂　；参考：《公路交通科技》2017年07期

【摘要】：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。
[Abstract]:In order to investigate the effect of salt content and load on the rheological properties of saturated fine sand soil with high salt content, uniaxial creep tests were carried out on saturated fine sand soil with different salt content under various load levels. The rheological behavior of saturated fine sand with high salt content is studied experimentally. The influence curve of load grade and salt content on the rheology of sand sample is obtained. It is found that for the soil sample with the same salt content, the larger the load is, the greater the final deformation is. The longer it takes for deformation to reach stability, and the more salt content increases under fixed load, the larger the final deformation of the specimen is, and the more time it takes to achieve deformation stability. Based on the experimental results and viscoelastic theory, the H-K model with three elements is selected. The fitting curve is in good agreement with the experimental data. Finally, the parameters of the model are analyzed. The results show that the three rheological parameters of the sample with the same salt content increase linearly with the increase of load, and the viscosity coefficient increases with the increase of salt content when the load is constant. However, both elastic modulus and viscoelastic modulus decreased.
【作者单位】：兰州交通大学土木工程学院;四川准达岩土工程有限责任公司;中铁十六局集团有限公司;青海省地方铁路建设投资有限公司;
【基金】：青海省交通建设科技项目(512287)
【分类号】：U412.221

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