振动频率对冻土破坏之影响

Influence of Vibration Frequency on the Failurre of Frozen Soil

饱和冻结粉土的单轴抗压振动试验结果表明，在恒定的动荷载（最大应力及最小应力恒定）作用下，冻土的破坏时间及破坏变形随振动频率的加快而减小。当频率小于８Ｈｚ时，频率的影响较大。频率大于８Ｈｚ时，影响较小。而冻土破坏振次与频率的关系取决于冻土的温度。冻土在－２℃时，破坏振次随频率加快而存在最小值；在－１℃时，则存在最大值；在，－１０℃时，随频率加快而增大且无极值。

Based on a large number of tests under constant dynamic stresses(constant maximum stress and min-mum stress),It ls found that the failure time and strain decrease with increasing vibration frequency,the influencedegree of frequency on failure time and strain decreases when the frequency is more than 8 Hz The relationship ofthe frequency and the failure numbers of vibration cycles depends on the soil temperature,the minimum value of thefailure cycle mumbers occurs at-2℃and a maximum value at-15℃,but no limit value is found at-10t.