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试验结果表明 ,冻土中桩的沉降过程主要是冻土在剪应力荷载作用下的流变过程 .桩的沉降速度随冻土温度的升高而增大 ,随桩表面粗糙度的增大而减小 ,随地基刚度的增大而增大 .当冻土中含水量达到饱和时 ,桩的沉降速度最小 .当荷载水平较高时 ,对应于动载下的沉降速度小于静载 ;随着荷载水平的降低 ,动载与静载对沉降速度的影响效果逐渐接近 .现有试验条件下 ,桩的沉降速度不随动荷载的频率而变化 .
The test results show that the settlement process of piles in frozen soil is mainly a rheological process of frozen soil under the action of shear stress. The settlement speed of piles increases with the increase of the temperature of frozen soil and increases with the increase of the surface roughness of piles. Decrease, increase with the increase of foundation stiffness. When the water content in the frozen soil reaches saturation, the settlement velocity of the pile is the minimum. When the load level is high, the settlement speed corresponding to dynamic load is smaller than the static load; As the load level decreases, the effect of dynamic load and static load on the settlement velocity gradually approaches. Under the existing experimental conditions, the settlement velocity of the pile does not change with the frequency of the dynamic load.