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为了解冻融作用对黄土路用性能的影响,以Q2黄土为研究对象,采用增湿法配制不同含水率试样,并在不补水条件下进行不同温度冻融循环后,分别开展液限、塑限、单轴固结及直剪试验,得出了Q2黄土液限、塑限、压缩模量、粘聚力及内摩擦角等物理力学指标与含水率、测试温度的关系。研究结果表明:天然含水率试样冻融后,塑性指数随测试温度降低而略有增大,土样压缩模量及抗剪强度随含水率增大而降低;测试温度对黄土力学性能的影响取决于试样的含水率,其中压缩模量随测试温度降低而降低,且其降幅与饱和度之间存在近似二次函数关系;当含水率小于临界值时,粘聚力随测试温度降低而增大,含水率大于临界值时粘聚力则减小;试样内摩擦角随测试温度的降低呈增大趋势,且含水率越大,内摩擦角的增幅越大。
In order to understand the influence of freezing and thawing on the performance of loess road, Q2 loess was taken as the research object. Different moisture content samples were prepared by humidification method. After freeze-thaw cycles without water supply, Plastic limit, uniaxial consolidation and direct shear test, the relationship between physical and mechanical indexes of Q2 loess such as liquid limit, plastic limit, compressive modulus, cohesion and internal friction angle, moisture content and test temperature were obtained. The results show that the plasticity index increases slightly with the decrease of the test temperature after freezing and thawing, and the compressive modulus and shear strength decrease with the increase of water content. The influence of test temperature on the mechanical properties of loess Determined by the moisture content of the sample, in which the compressive modulus decreases with decreasing test temperature, and there is an approximate quadratic function between the drop and saturation; when the moisture content is less than the critical value, the cohesion decreases with the test temperature Increase, the moisture content is greater than the critical value of cohesion is reduced; sample friction angle decreases with the test temperature increases, and the greater the moisture content, the greater the increase of the internal friction angle.