冻融循环条件下重塑黄土水分迁移及其对力学性质影响

Moisture Migration of Remolded Loess under Freeze-Thaw Cycles and Its Effect on Mechanical Properties

以西安地区黄土为研究对象,通过常规三轴剪切试验,研究了冻融循环对重塑黄土物理力学性质的影响。结果表明:试样冻融过程中水分不断向冰晶冰冻锋面迁移;即试样冻结过程中水分向试样表面迁移,融化之后水分向试样内部迁移;在此过程中试样结构性破坏,内部空隙增大,其剪切强度逐渐减小;故而试样含水率越大,冻融过程中水分迁移量越大,试样破坏越明显,其剪切强度降低越明显。

The effect of freeze-thaw cycle on the physical and mechanical properties of remolded loess was studied by conventional triaxial shear test.The results show that during the freezing and thawing process,the moisture moves to the freezing front of the ice crystal,that is,the moisture moves to the surface of the sample during the freezing process,and the moisture moves to the inside of the sample after thawing,and the structural failure of the specimen occurs during the process of freezing and thawing.The larger the moisture content of the sample is,the greater the moisture migration is during the freeze-thaw process,and the more obvious the damage is,the more obvious the shear strength is.