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。
In order to discuss the influence of salt content and load on the rheological property of saturated fine sand with high salinity, the uniaxial creep test of saturated fine sand with different salt contents under various load levels is carried out, the experimental study on rheological property of saturated fine sand soil with high salinity is carried out, and the curves of influence law of load grade and salt content on the rheological characteristic of sand samples are obtained. It is found that longer time is required to achieve stable deformation for the soil sample with same salt content, because the greater the load, the larger the final deformation. Meanwhile, the increase of salt content under fixed load will enlarge the final deformation of the sample, and the time required to achieve stable deformation is also prolonged significantly. Based on the experimental result and the viscoelastic theory, the 3-unit H - K model is chosen, and the fitting curve is basically consistent with the experimental data. Finally, the parameters analysis for the model is made, the result shows that （ 1 ） the 3 rheological parameters of the samples with same salt content increase linearly with the increase of load; with the increase of salt content under steady load, the viscosity coefficient increases while both elastic modulus and viscoelastic modulus reduce.
出处
《公路交通科技》
CAS
CSCD
北大核心
2017年第7期29-36,共8页
Journal of Highway and Transportation Research and Development
基金
青海省交通建设科技项目(512287)
关键词
道路工程
高含盐细砂
蠕变试验
流变特性
H-K模型
road engineering
fine sand with high salinity
creep test
theological characteristic
H - K model
