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| Experimental study and numerical simulation to the process of frost heave in saturated silt |
| ZHOU Jiazuo1，WEI Changfu1，LI Dongqing2，WEI Houzhen1，PEI Wansheng2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China) |
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Abstract A series of experiments on frost heaving of 1D saturated silt columns were conducted under the different experimental conditions to comprehensively investigate the influence of temperature gradients，freezing rate，height of sample and vertical load on frost heaving. The temperature of samples，the vertical load，and the amount of frost heaving and the water intake were measured during each experiment. The experimental results show that when the temperature is quasi-steady，the frost heaving rate increases proportionally with the temperature gradient and decreases linearly with the vertical load. The specific freezing rate was defined as the ratio of freezing rate to the height of sample. When the temperature is unsteady，the frost heaving rate increases with the specific freezing rate in the form of power law and the rate of increasing decreases as the specific freezing rate increases. A formula for calculating the frost heaving was presented upon the comprehensively consideration of the temperature gradient，freezing rate，vertical load and height of sample. The thermal diffusion equation considering the water migration in frozen soil was deduced on the basis of the formula of frost heaving and the numerically solution was presented. The numerical results of the variation of temperature and frost heaving were compared with the experimental data，which confirmed the reliability of the simulating method.
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2017, Vol. 36 
