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针对有应力反向与无应力反向两种循环应力条件,进行了k0固结饱和粘土不排水循环三轴压缩与拉伸强度试验。为了分析三轴压缩与三轴拉伸循环强度之间关系,依据3个围压下三轴压缩循环强度试验结果,确定了与不同循环破坏次数对应的Mohr-Coulomb循环强度指标。据此预测k0固结土样三轴拉伸循环强度,预测结果小于实测结果,当循环破坏次数为2 000时,两者之间相对偏差为13%左右。因此,可以依据Mohr-Coulomb强度理论建立k0固结饱和粘土不排水三轴压缩与拉伸循环强度之间的关系。
According to the cyclic stress conditions of stress reversal and stressless reversal, triaxial compression and tensile strength tests of undrained cyclic k0 consolidated saturated clays were carried out. In order to analyze the relationship between triaxial compression and triaxial tensile cycle strength, the Mohr-Coulomb cycle strength index corresponding to the different cyclic failure numbers was determined based on the results of three triaxial compression cycle strength tests at three confining pressures. Based on this, the triaxial tensile cycle strength of k0 consolidated soil is predicted. The predicted result is smaller than the measured value. When the number of cyclic damage is 2 000, the relative deviation between the two is about 13%. Therefore, the relationship between undrained triaxial compression and tensile cycle strength of k0 consolidated saturated clays can be established based on Mohr-Coulomb strength theory.