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中文摘要：
对经过10次冻融循环的青藏人工冻结粉土试样在-1℃恒温状态下进行了3Hz和5Hz两种加载频率、不同动应力幅值的单轴循环动荷载压缩试验。试验结果表明：冻融循环后高温冻结粉土的累积应变随着振动次数的增加呈增长的趋势,在相同的振次时,动荷载应力幅值越大,累积应变越大;频率越高,临界动应力越小;初始阶段应变速率随时间的增大而减小,但随着振动时间的增加,破坏型曲线的应变速率达到一个最小值后开始增大,稳定型曲线的应变速率则在一定幅度的范围内波动;在振动时间相同时,动应力幅值越大、动荷载振动频率越高,应变速率越大;动应力幅值越大,破坏应变越大,破坏时间越短;同一动应力幅值下,频率越高,破坏时间越短。
英文摘要：
Uniaxial dynamic compression tests on Qinghai-Tibet artificially frozen silt after 10 freeze-thaw cycles were carried out under different cyclic loadings at-1℃.The vibration frequencies were 3Hz and 5Hz.The test results show that the accumulative strain increases with the increase of vibration times.When vibration time is the same,the higher the dynamic stress,the larger the accumulative strain.The higher the frequency,the less the critical dynamic stress.The strain rate decreases with time at the first vibration stage.With the increase of vibration time,the strain rate in the failure type curve reaches a minimum and then starts to increase,but the strain rate in the stable type curve waves are within a certain range.When vibration time is constant,the strain rate increases with the increases in vibration frequency and dynamic stress.The higher the dynamic stress,the larger the failure strain and the shorter the failure time.When the dynamic stress is constant,the higher the frequency,the shorter the failure time.
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