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中文摘要：
对-1℃的冻土试样在频率5 Hz的循环荷载下进行了单轴压缩试验,探讨了冻土在循环荷载下的滞回圈演化规律。结果表明：累积应变与循环次数的关系曲线可分为破坏型和稳定型。对于破坏型曲线,循环过程中滞回圈表现出从稀疏—紧密—略微稀疏的变化特征,滞回圈的不闭合程度和面积都呈现出从大—小—略微变大的特征;对于稳定型曲线,循环过程中滞回圈表现出从稀疏—紧密的变化过程,滞回圈的不闭合程度和面积整体上看都比较小,且有逐渐变小的趋势。无论破坏型还是稳定型曲线,各个循环的卸载段始终表现出应变滞后于应力;对于破坏型曲线,初始循环的加载段应变滞后于应力,到一定循环次数后应变基本与应力同步,滞回圈呈柳叶型;对于稳定型曲线,初期循环的加载段应变基本与应力同步,到一定循环次数后应变超前于应力,滞回圈呈新月型。最大动应力越大,滞回圈的面积越大,每个循环中的能量耗散越多,试样越容易破坏。
英文摘要：
Uniaxial cyclic compression tests on frozen soil at-1℃ under 5 Hz are carried out.The evolution laws of hysteresis loops are studied.The results show that the changing curves of accumulated strain with cyclic number can be divided into failure type and stable type.For failure type curves,the hysteresis loops change from sparse to close and then slightly sparse;the opening degree and the area of the hysteresis loops change from big to small and then slightly larger with the cyclic loading.For stable type curves,the hysteresis loops change from sparse to close;on the whole,the opening degree and the area of the hysteresis loops are quite small and gradually decrease with the cyclic loading.For both the failure type and the stable type curves,the strain lags the stress at the unloading stage.For the failure type curves,in the initial loading cycles,the strain lags the stress;after a certain number of cycles,the strain and the stress are almost synchronized,and the shape of the hysteresis loops is willow leaf.For the stable type curves,the strain and the stress are almost synchronized in the initial loading cycles;after a certain number of cycles the strain goes in advance of the stress,and the shape of the hysteresis loops is crescent.With the increasing maximum dynamic stress,the area of the hysteresis loops will increase,which means that the energy dissipation will increase and the sample will be damaged more easily.
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