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为了研究不同冻融循环次数下含水量变化对季节性冻土地区高含水量黄土压缩变形特性的影响,以山西阳曲地区高含水量黄土为研究对象,分别进行不同含水率、冻融循环次数的侧限压缩试验,并引入压缩变形系数来表达黄土的压缩变形特性。研究表明,当含水率达到22%时,未经冻融土样表现出明显的湿软特性,随着冻融循环次数的增加,土样的湿软特性逐渐加剧,且冻融循环次数5次之前土样的压缩变形较大;随着含水率的逐级增加,存在一个含水率阈值,使得冻融循环作用对土样的压缩变形特性将产生显著的影响;并通过割线模量法对该黄土压缩变形过程中的应力应变关系进行分析,得出拟合结果。
In order to study the effect of water content under different freeze-thaw cycles on the compressive deformation characteristics of high moisture content loess in seasonal frozen soil region, the high water content loess in Yangqu of Shanxi Province was selected as the research object, and different water content, freeze-thaw cycles Of the lateral compression test, and the introduction of compressive deformation coefficient to express the compressive deformation of loess. The results show that when the moisture content reaches 22%, the samples without wetting and thawing show obvious wet-soft characteristics. With the increase of the number of freeze-thaw cycles, the wet and soft characteristics of soil samples gradually aggravate, and the number of freeze-thaw cycles is 5 Before compression, the compressive deformation of soil samples is larger. With the gradual increase of moisture content, there is a threshold value of water content, so that the effect of freeze-thaw cycles will have a significant effect on compressive deformation of soil samples. The stress-strain relationship of the loess compression deformation was analyzed and the fitting result was obtained.