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压缩特性是黄土的重要力学特性,是季节性冻土区黄土工程设计的重要依据。为研究冻融循环和含水量变化对黄土压缩特性的影响,以山西阳曲1号隧道为背景,对不同含水量的黄土进行冻融循环后的系列试验。结果表明:冻融循环通过强风化作用于土中自由水,使得土中自由水发生了原位的冻胀融沉和迁移,破坏了土颗粒的胶结物质,改变了土样固体颗粒的粒径分布,粗颗粒减小,细颗粒增加。使得土体的孔隙比、干密度、体积均增加,压缩系数的变化与含水量和冻融循环次数正相关,压缩模量的变化与含水量和冻融循环次数反相关,压缩性增强。本文的研究结果可对阳曲甚至山西的黄土工程提供帮助。
Compressive properties are the important mechanical properties of loess and are important basis for the engineering design of loess in seasonal frozen soil area. In order to study the influence of freeze-thaw cycles and moisture content on the compression characteristics of loess, a series of experiments were conducted on the loess with different water contents under the background of the Yangqu No. 1 tunnel in Shanxi Province. The results show that the freeze-thaw cycle acts on the free water in the soil through strong weathering, causing the free water in the soil to undergo freeze-thaw thawing and migration in situ, destroying the cementitious material of the soil particles and changing the particle size of the soil solid particles Distribution, coarse particles decreased, fine particles increased. The void ratio, dry density and volume of the soil were increased. The change of the compressibility was positively correlated with the water content and the number of freeze-thaw cycles. The change of the compressive modulus was inversely correlated with the water content and the freeze-thaw cycles, and the compressibility was enhanced. The result of this paper can help the loess and even the loess project in Shanxi.