温度及冻融循环对滨海盐渍土土—水特征曲线的影响研究

Effect of Temperature and Freeze-thaw Cycles on Soil-water Characteristics Curve of Coastal Saline Soil

为探讨环境温度、冻融循环次数对滨海盐渍土持水特性的影响,以黄骅地区滨海盐渍土作为研究对象,通过滤纸法测得不同环境温度及冻融循环次数下各试样的基质吸力、渗透吸力、总吸力土—水特征曲线,分析不同因素下盐渍土土—水特征曲线及持水特性的变化规律;通过Van Genuchten(VG)模型对试验结果进行拟合分析.结果表明:随着环境温度和冻融循环次数增加,盐渍土持水性能降低,其中冻融循环对持水特性的影响随着次数的增加而逐渐减小.VG模型对滨海盐渍土土—水特征曲线的拟合优度较高;根据试验结果及拟合结果,分别建立了考虑环境温度、冻融循环次数的土—水特征曲线模型,可为滨海盐渍土区域的工程建设提供参考.

In order to explore the effects of environmental temperature and freeze-thaw cycles on the water retention characteristics of coastal saline soil,taking coastal saline soil in Huanghua area as the research object,the matric suction,osmotic suction and total suction soil-water characteristic curves of each sample under different environmental temperature and freeze-thaw cycles were measured by filter paper method,and the change laws of soil-water characteristic curves and water retention characteristics of saline soil under different factors were analyzed.The experimental results were fitted and analyzed by Van Genuchten(VG)model.The results show that with the increase of environmental temperature and the number of freeze-thaw cycles,the water retention performance of the saline soil decreases.The influence of freeze-thaw cycles on the water retention characteristics decreases with the increase of the number of freeze-thaw cycles.The VG model has a good fit for soil-water characteristic curve of coastal saline soil.According to the experimental results and fitting results,soil-water characteristic curve models were established respectively considering the environmental temperature and the number of freeze-thaw cycles,which can provide reference for engineering construction in coastal saline soil area.