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为研究冻融循环对结构性黄土构度指标的影响,以山西阳曲一号隧道黄土为研究对象,基于综合结构势和构度概念为理论基础,对不同含水率黄土进行了不同冻融循环次数的无侧限抗压试验。试验表明:原状土样和重塑土样在含水率变大的过程中,单轴抗压强度均减小,且呈现出相同的变化趋势,而原状土样的无侧限单轴抗压强度均高于同含水率重塑土的无侧限单轴抗压强度,有着明显的结构强度。黄土的无侧限抗压强度和构度随着含水率和冻融循环次数的增加而减小的主要原因是由于黄土的结构性被土中水和冻融循环综合作用破坏的结果,该研究可为季节性黄土地区隧道建设提供科学依据。
In order to study the effect of freeze-thaw cycles on the structural loess structural index, taking the loess in Yangqu-1 tunnel of Shanxi as the research object, based on the concept of comprehensive structural potential and structure, the different loess sections were subjected to different freeze-thaw cycles Number of unconfined compressive tests. The results show that the uniaxial compressive strength of undisturbed soil samples and remolded soil samples decrease with the increase of water content, and they show the same tendency of change. The unconfined uniaxial compressive strength Both are higher than unconfined uniaxial compressive strength of rehabilitated soil with the same moisture content, and have obvious structural strength. The main reason for the decrease of unconfined compressive strength and structure of loess with the increase of water cut and freeze-thaw cycles is the result of the destruction of the structural properties of loess by the combination of soil water and freeze-thaw cycles. It can provide scientific basis for tunnel construction in seasonal loess area.