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利用等压固结的方法将深部粘土在室内恢复至其原始地压状态,研究高压力作用下形成冻土在径向卸载状态下的力学行为、强度特征.结果表明:经等压固结再冻结的粘土试样在整个径向卸载过程中应力-应变行为属于典型的粘-塑性破坏类型,其三轴屈服强度与初始围压无关,而随冻土温度的降低呈现线性增大的趋势.卸载过程中的应力-应变行为符合修正后的Duncan-Chang模型.
Using the method of isobaric consolidation, the deep clay was restored to its original state of pressure in the chamber, and the mechanical behavior and strength characteristics of the frozen soil under radial pressure were studied under high pressure.The results show that The stress-strain behavior of the frozen clay sample during the whole radial unloading process belongs to the typical type of viscous-plastic failure. The triaxial yield strength of the frozen clay specimen has nothing to do with the initial confining pressure, but shows a linear increase with the decrease of the temperature of frozen soil. The stress-strain behavior during unloading met the modified Duncan-Chang model.