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循环荷载作用下,饱和软粘土将发生应变软化现象。通过对杭州饱和软黏土进行应力控制的循环三轴试验,研究循环次数、循环应力比、固结比、频率、超固结比对土体应变软化的影响。试验结果表明,循环次数的增加,循环应力比的提高,都将加快土体软化;循环荷载作用下,软黏土存在临界循环应力比,当循环应力比较小或较大时,软化指数与lgN近似为线性关系,而当循环应力比在临界循环应力比左右时,两者表现为明显的曲线关系。
Under cyclic loading, the strain softening phenomenon will occur in saturated soft clay. Through the cyclic triaxial tests of stress-controlled saturated clay in Hangzhou, the effects of cycle number, cyclic stress ratio, consolidation ratio, frequency and overconsolidation ratio on soil strain softening were studied. The experimental results show that the increase of cycle number and cyclic stress ratio will accelerate the soil softening. Under cyclic loading, the critical cyclic stress ratio of soft clay exists. When the cyclic stress is small or large, the softening index is similar to lgN For the linear relationship, and when the cyclic stress ratio in the critical cyclic stress ratio around, the two showed a significant curve.