冻融循环对黄土电阻率及水分迁移影响的试验研究
发布时间：2019-03-17 10:26
【摘要】：电阻率为土体的固有特性,与土中水含量、颗粒排列和链接方式有着密切的关系。为了研究冻融循环次数对黄土的电阻率的影响,对经历不同冻融循环次数的不同含水状态黄土的电阻率进行了试验研究,分析了黄土电阻率与含水量、冻融循环次数的关系,建立了考虑含水量、冻融循环次数的非饱和土电阻率模型。试验结果表明:干密度一定时,电阻率随着含水量的增高而快速降低,当含水量达到26%后,电阻率变化规律逐渐趋于稳定;当冻融循环次数少于5次时,电阻率随着冻融循环次数的增加缓慢增长;冻融循环次数超过5次后,电阻率值逐渐趋于稳定。通过对冻融前后土样不同区域的含水量值的比较可知,冻融循环作用后,土中水总体呈现出从中心向四周的扩散的迁移规律。
[Abstract]:Resistivity is the inherent characteristic of soil, which is closely related to water content, particle arrangement and linking mode in soil. In order to study the influence of freezing and thawing cycles on the resistivity of loess, the resistivity of loess with different freezing and thawing cycles was tested and studied, and the relationship between the resistivity of loess and water content, freezing and thawing cycles was analyzed. The resistivity model of unsaturated soil considering water content and freezing-thawing cycles is established. The results show that when the dry density is constant, the resistivity decreases rapidly with the increase of water content, and when the water content reaches 26%, the law of resistivity changes gradually becomes stable. When the number of freeze-thaw cycles is less than 5 times, the resistivity increases slowly with the increase of freeze-thaw cycles, and when the freezing-thawing cycles exceed 5 times, the resistivity values tend to stabilize gradually. Through the comparison of the water cut values in different regions of soil samples before and after freezing and thawing, it can be seen that after freezing and thawing cycle, the water in the soil generally shows the law of diffusion from the center to the surrounding.
【作者单位】： 西安科技大学研究生院建筑与土木工程学院;
【分类号】：TU444
本文编号：2442202
[Abstract]:Resistivity is the inherent characteristic of soil, which is closely related to water content, particle arrangement and linking mode in soil. In order to study the influence of freezing and thawing cycles on the resistivity of loess, the resistivity of loess with different freezing and thawing cycles was tested and studied, and the relationship between the resistivity of loess and water content, freezing and thawing cycles was analyzed. The resistivity model of unsaturated soil considering water content and freezing-thawing cycles is established. The results show that when the dry density is constant, the resistivity decreases rapidly with the increase of water content, and when the water content reaches 26%, the law of resistivity changes gradually becomes stable. When the number of freeze-thaw cycles is less than 5 times, the resistivity increases slowly with the increase of freeze-thaw cycles, and when the freezing-thawing cycles exceed 5 times, the resistivity values tend to stabilize gradually. Through the comparison of the water cut values in different regions of soil samples before and after freezing and thawing, it can be seen that after freezing and thawing cycle, the water in the soil generally shows the law of diffusion from the center to the surrounding.
【作者单位】： 西安科技大学研究生院建筑与土木工程学院;
【分类号】：TU444
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