| Abstrakt: |
In the prediction and control of frost heave and thaw settlement, the effect of external load, especially large load, on inhibiting frost heave and the law of frost heave deformation are the key to predict and control frost heave deformation. Through the frost heave test of remolded silty clay in the condition of water replenishment, the influence and evolution law of different load levels on the frost heave characteristics of remolded silty clay were studied. The results showed that the cooling law of samples with different loads was similar, which was mainly divided into four stages: constant temperature, rapid temperature drop, slow temperature drop and temperature stability. The overall performance was that the greater the load, the faster the temperature drop. The development curves of freezing front with time with different loads showed a logarithmic growth trend. With the increase of load, the development speed of freezing front in the early stage of freezing was accelerated, and the development speed of front in the middle and late stages was slowed down. The height of front position decreased with the increase of load. With the increase of load, the time when the initial frost heaving amount appeared delayed, the time when the frost heaving amount reached stable development shortened, the development rate of frost heaving amount decreased, and the frost heaving amount decreased. The final frost heaving amount of soil sample without load was 6. 4 times that under 200 kPa. The frost heaving ratio decreased exponentially with the increase of the overlying load, and the final frost heaving ratio of soil samples with no load was 5. 6 times that under 200 kPa. [ABSTRACT FROM AUTHOR] |
