DOI：10.3969/j.issn.1672-3872.2024.15.001
基金项目：国家自然科学基金项目（51778528）；陕西省土地工程建设集团科技计划项目（DJNY2024-12）
作 者：王秦泽 （陕西省土地工程建设集团有限责任公司，陕西 西安 710075）
摘 要：【目的】研究地下水位升降对渭北旱塬区黄土冻结温度的影响。【方法】以陕西省宝鸡市千阳县高崖镇高标准农田灌溉区的黄土为研究对象，通过室内冻结试验，进行了不同水盐含量下的冻结温度试验，研究了地下水位升降对黄土水盐迁移通道长度的影响和表层黄土水盐含量的变化，分析了不同水盐含量状态下黄土冻结温度的变化规律。【结果】地下水位线降低，黄土水盐迁移通道加长，迁移到黄土表层的水盐含量降低；地下水位线升高，黄土水盐迁移通道缩短，迁移到黄土表层的水盐含量增加；含盐黄土冻结温度随含水量的增加而非线性升高，且无限接近0 ℃，土中影响冻结温度的主要是毛细水；冻结温度随含盐量的增加而近似线性降低。【结论】高标准农田灌溉区黄土的水盐含量受地下水位升降的影响，地下水位升降会改变水盐迁移通道长度及水盐迁移量，影响表层黄土的水盐含量，进而影响表层黄土的冻结温度，本研究对工程实践具有指导意义。
关键词：地下水位线；水盐迁移通道；水盐含量；冻结温度
Analysis of the Impact of Groundwater Level Rise and Fall on the Freezing Temperature of Loess
Wang Qinze (Shaanxi Land Engineering Construction Group Co., Ltd., Shaanxi Xi’an 710075)
Abstract: [Objective] To study the effect of groundwater level fluctuations on the freezing temperature of loess in the Weibei arid plateau area. [Method] The loess in the high standard farmland irrigation area of Gaoya Town, Qianyang County, Baoji City, Shaanxi Province was taken as the research object. Through indoor freezing experiments, freezing temperature experiments were conducted under different water and salt contents. The influence of groundwater level fluctuations on the length of loess water and salt migration channels and the changes in surface loess water and salt content were studied. The variation law of loess freezing temperature under different water and salt content states was analyzed. [Result] The groundwater level line decreases, the migration channel of water and salt in loess is extended, and the water and salt content that migrates to the surface of loess is reduced. The groundwater level rises, the migration channel of water and salt in loess shortens, and the content of water and salt migrating to the surface of loess increases. The freezing temperature of saline loess increases nonlinearly with the increase of water content, and is infinitely close to 0 ℃. The main factor affecting the freezing temperature in the soil is capillary water. The freezing temperature decreases approximately linearly with the increase of salt content. [Conclusion] The water and salt content of loess in high standard farmland irrigation areas is affected by the rise and fall of groundwater level. The rise and fall of groundwater level will change the length of water and salt migration channels and the amount of water and salt migration, affecting the water and salt content of surface loess, and thus affecting the freezing temperature of surface loess. This study has guiding significance for engineering practice.
Keywords: groundwater level line; water salt migration channels; water and salt content; freezing temperature
引文信息：[1]王秦泽.地下水位升降对黄土冻结温度的影响分析[J].南方农机，2024，55(15)：1-3+11.
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