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深部土体冻融后的物理力学性质对深部人工冻结工程意义重大.针对该问题,在以往土的冻融试验装置的基础上,设计出适用于高压条件下土的室内冻融试验装置,并给出了高压条件下土的冻融试验方法.基于该装置,对有压条件下兰州黄土在不同冷端温度下的单向冻结特征进行了试验研究.结果表明:无压单向冻结过程中土的变形以冻胀为主,而高压情况下则主要表现为压缩变形.在有压单向冻结过程中,试样内部仍然存在着明显的水分重分布过程.试验分析表明,该试验装置能够为高压条件下土的冻结特征及冻融作用后土的物理力学性质研究提供技术支持.
The physical and mechanical properties of deep soil after freezing and thawing are of great significance to the artificial freezing engineering in deep area.According to this problem, based on the former soil freezing and thawing test equipment, an indoor freezing and thawing test device suitable for soil under high pressure conditions is designed Based on this device, the unidirectional freezing characteristics of Lanzhou loess at different cold temperatures were experimentally studied.The results show that during uncompressed one-way freezing process Soil deformation is dominated by frost heave, while in high pressure it is mainly compressive deformation.While in the unidirectional one-way compression process, there is still obvious redistribution of water inside the sample.Experimental analysis shows that the test device can It provides technical support for the freezing characteristics of soil under high pressure and the physical and mechanical properties of soil after freezing-thawing.