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冻土试样的制备是进行冻土试验最为基础而重要的工作,其中土样在冻结过程中受到的影响直接关系到试样内部状况.为研究冻结方式对粉质粘土含水量和干密度分布的影响,采取不同的冻结方式即单向冻结和多向冻结方法,对比分析不同状态下兰州黄土和北麓河粘土冻结试样各部位含水量与干密度的分布状况.结果表明:试样内含水量和干密度的分布程度取决于土的类型、饱和状态和冻结方式,具体为:非饱和兰州黄土在多向冻结情况下,可以取得比单向冻结更加均匀的冻结试样;饱和兰州黄土冻结试样无论是单向冻结还是多向冻结都较为均匀;北麓河粘土无论饱和与否,均以单向冻结为好.
The preparation of permafrost samples is the most important and important work in permafrost experiment, in which the impact of soil samples in the freezing process is directly related to the internal conditions of the samples.In order to study the frozen water content and dry density distribution of silty clay The freezing and multi-directional freezing methods were adopted to analyze the distribution of water content and dry density in different parts of Lanzhou loess and Beiluhe clay frozen samples under different conditions.The results showed that the distribution of water content and dry density The distribution of water content and dry density depends on the type of soil, the state of saturation and the way of freezing. Specifically, the unsaturated Lanzhou loess can obtain a more uniform frozen sample than the unidirectional frozen under the condition of multi-directional freezing. Saturated Lanzhou loess Frozen samples are unidirectional freezing or multi-directional freezing are more uniform; Beiluhe clay whether saturated or not, are unidirectional frozen as well.