【摘要】：電阻率為土體的固有特性,與土中水含量、顆粒排列和鏈接方式有著密切的關(guān)系。為了研究凍融循環(huán)次數(shù)對黃土的電阻率的影響,對經(jīng)歷不同凍融循環(huán)次數(shù)的不同含水狀態(tài)黃土的電阻率進(jìn)行了試驗研究,分析了黃土電阻率與含水量、凍融循環(huán)次數(shù)的關(guān)系,建立了考慮含水量、凍融循環(huán)次數(shù)的非飽和土電阻率模型。試驗結(jié)果表明:干密度一定時,電阻率隨著含水量的增高而快速降低,當(dāng)含水量達(dá)到26%后,電阻率變化規(guī)律逐漸趨于穩(wěn)定;當(dāng)凍融循環(huán)次數(shù)少于5次時,電阻率隨著凍融循環(huán)次數(shù)的增加緩慢增長;凍融循環(huán)次數(shù)超過5次后,電阻率值逐漸趨于穩(wěn)定。通過對凍融前后土樣不同區(qū)域的含水量值的比較可知,凍融循環(huán)作用后,土中水總體呈現(xiàn)出從中心向四周的擴(kuò)散的遷移規(guī)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.
【作者單位】： 西安科技大學(xué)研究生院建筑與土木工程學(xué)院;
【分類號】：TU444

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