土质对人工冻土冻结温度影响的试验研究

不同土质的冻结温度是人工冻结法冻结壁设计重要依据。为研究土质对人工冻土冻结温度的影响，选取不同地区人工冻结法施工典型土层开展冻结温度试验，提供了不同地区典型土层的冻结温度范围，并结合水泥土、含盐土冻结温度试验进行对比分析。结果表明：同一地区不同土层的冻结温度随其土颗粒粒径的增大而增大；随水泥掺入比及龄期的增加，水泥土的冻结温度降低；随含盐量的增加，NaCl含盐土冻结温度线性降低，含盐量对氯盐土比对硫酸盐土的冻结温度影响更显著。研究成果对不同土性的冻结壁设计具有指导意义。

An experimental study on influence of soil properties on freezing temperature of artificial frozen soil

The freezing temperature of soil with different properties is an important basis for the design of the freezing wall by the artificial freezing method. The purpose of this study was to reveal the influence of soil properties on freezing temperature of artificial frozen soil. Tests of freezing temperature were carried out on selected typical soil layers in different regions where artificial freezing method was used in construction. The freezing temperature range of typical soil layers in these regions was determined, and the comparative analysis was conducted coupling with the freezing temperature tests of cement soil and saline soil. The results show that the freezing temperature of different soil layers in the same area increases with growth of the soil particle size. As the cement incorporation ratio and age are increased, the freezing temperature of this cement soil declines. With more salt content, the freezing temperature of saline soil NaCl decreases linearly and the salt content has a more significant effect on the freezing temperature of chlorinated soil than that of sulfated soil. The research results have guiding significance for the design of freezing walls with different soil properties.