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针对青藏铁路北麓河粉质粘土,利用冻融循环全过程电阻率试验设备获取封闭系统下冻融过程电阻率、土体温度场、冻胀融沉变形量全过程曲线,探讨了饱和粉质黏土正冻正融过程电阻率及变形特性。试验结果表明:冻融循环过程中电阻率与冻融变形的变化是实时的、完全同步的,利用电阻率特性研究冻融过程土体结构变化是可行的;每次冻融冻土电阻率随着冻融次数增加呈指数关系减小,融土电阻率随冻融次数增加呈指数关系增加;每次冻胀量与融沉量随冻融次数的增加而减小,平均干密度随冻融次数增加而增加,并且经过5次冻融循环后冻胀融沉量和干密度均趋于稳定。
For the Beiluhe silty clay of Qinghai-Tibet Railway, the whole process curve of resistivity, soil temperature field and frost heave thaw settlement in freezing and thawing process under closed system was obtained by the whole-process resistivity test equipment of freeze-thaw cycle. Clay normal freezing process resistivity and deformation characteristics. The experimental results show that the changes of resistivity and freeze-thaw deformation during the freeze-thaw cycles are real-time and completely synchronous. It is feasible to study the change of soil structure during freezing-thawing process based on the resistivity characteristics. The number of freeze-thaw increases exponentially decreases, the soil resistivity increases with the number of freeze-thaw cycles increased exponentially; each amount of frost heaving and thaw settlement decreases with the increase in the number of freeze-thaw cycles, the average dry density with the freeze-thaw The number increased and increased, and after 5 freeze-thaw cycles, the thawing settlement and the dry density tended to be stable.