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将冻结速度分别设定为3.33、1.67、1.11、0.83℃·h-1,在封闭条件下对不同含水率土样进行冻融循环,测试了不同冻结速度时土样的含水率、干密度、液塑限、抗剪强度及压缩性,分析了冻结速度对冻融黄土物理力学性质的影响规律。试验结果表明:经过冻融循环后,试样含水率普遍较初始含水率大,随着冻结速度的增大,含水率的增幅呈降低趋势;当含水率较低时,冻结速度对试样干密度影响较小,当含水率较高时,随着冻结速度的增大,试样干密度降低;土样液限随着冻结速度的增大呈增大趋势,塑限无明显变化;粘聚力随着冻结速度的增大总体呈增大趋势,内摩擦角随冻结速度的变化规律与试样含水率密切相关;冻融后黄土的压缩性较未冻结土样强,且随着冻结速度的增大,土样的压缩模量增大。
The freezing speed was set to 3.33, 1.67, 1.11 and 0.83 ℃ · h-1, respectively. The freezing and thawing cycles of soil samples with different water contents were carried out under confined conditions. The moisture content, dry density, Plastic limit, shear strength and compressibility, the influence of freezing speed on the physical and mechanical properties of frozen-thawed loess was analyzed. The results show that after the freeze-thaw cycle, the moisture content of the sample is generally higher than the initial moisture content, with the increase of the freezing rate, the increase of the moisture content tends to decrease; when the moisture content is low, the freezing speed of the sample When the moisture content is higher, the dry density of the sample decreases with the increase of the freezing speed. The liquid limit of the sample increases with the increase of the freezing speed, but the plastic limit does not change obviously. The force tends to increase with the increase of the freezing speed, and the variation of the internal friction angle with the freezing speed is closely related to the moisture content of the sample. The compressibility of the loess after freeze-thaw is stronger than that of the frozen soil, Increase, the compressive modulus of soil samples increased.