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根据不同振幅动荷载的三组蠕变试验结果,比较了冻结粉土在不同动荷载作用下的蠕变变形和动蠕变强度特征,发现,当动荷载振动幅值不同时,动蠕变曲线变化规律以及动蠕变强度特征变化规律都相似,但数值上有较大差别;在相同静荷载基础上叠加不同振幅动荷载时,在整个蠕变过程中,振幅越大,变形越大。而对于卸载到零的动荷载试验来说,初始蠕变阶段和稳定蠕变阶段的变形较小,但由于蠕变速率很大,变形迅速增加,很快进入渐进流阶段,随后变形变得很大;冻土的动蠕变强度随时间有规律地衰减;动荷载的振幅越大,破坏时间越短,土体越容易发生破坏。
According to the results of three sets of creep tests with different amplitude dynamic loads, the creep deformation and dynamic creep strength of frozen silt under different dynamic loads are compared. It is found that the dynamic creep curves The regularity of variation and dynamic variation of dynamic creep strength are similar, but the values are quite different. When the dynamic loads with different amplitudes are superimposed on the same static load, the larger the amplitude and the greater the deformation in the entire creep process. For the dynamic load test unloaded to zero, the deformation in the initial creep phase and in the steady creep phase is small, but due to the large creep rate, the deformation increases rapidly and quickly enters the asymptotic flow phase, and then the deformation becomes very The dynamic creep strength of frozen soil decreases regularly with time. The larger the amplitude of dynamic load, the shorter the damage time, the more damage the soil is likely to occur.