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On the frost heaving-induced pressure response and its dropping power-law behaviors of freezing soils under various restraints

机译：不同约束条件下冻土的冻胀诱发压力响应及其下降幂律行为

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摘要

A one-dimensional frost heave testing system is developed in this paper to investigate the frost heaving-induced pressure (FHIP) of frost susceptible silty clay under various restraints and thermal gradients. The evolution of the frost heave, the moisture migration, and the FHIP are examined from the conducted freezing tests, as well as the effects of restrained stiffness and thermal gradient. The development of frost heave can be divided into four stages, i.e. the constant temperature stage, the rapid development stage, the transition development stage, and the stable stage. For tests with -20 degrees C at the cold end of the tested samples, the ultimate heave is 5.88 mm, 4.86 mm and 4.31 mm, and the FHIP is 65.0 kPa, 71.1 kPa and 92.1 kPa, corresponding to the restrained stiffness of 11.06 kPa/mm, 14.62 kPa/mm and 21.36 kPa/mm, respectively. It can be found that the frost heave decreases gradually with the restrained stiffness, whereas the FHIP shows an increase with the retrained stiffness. The results indicate that the FHIP drops rapidly with the relaxation of restraints, while this downward trend slows down as the frost heaving ratio increases. It is found that the FHIP decreases following an exponential function with the increase of frost heaving ratio, and the FHIP shows a dropping power-law behavior with an exponent of approximately 8/5.
机译：本文开发了一种一维的冻胀试验系统，以研究在各种约束和温度梯度下易受冻蚀的粉质黏土的冻胀诱发压力（FHIP）。通过进行的冷冻测试，检查了冻胀的演变，水分迁移和FHIP，以及受约束的刚度和热梯度的影响。冻胀的发展可以分为四个阶段，即恒温阶段，快速发展阶段，过渡发展阶段和稳定阶段。对于在被测样品的冷端温度为-20摄氏度的测试，极限起伏分别为5.88 mm，4.86 mm和4.31 mm，FHIP为65.0 kPa，71.1 kPa和92.1 kPa，对应于11.06 kPa的约束刚度/mm、14.62 kPa / mm和21.36 kPa / mm。可以发现，随着约束刚度的增加，冻胀逐渐减小，而随着再约束刚度的增加，FHIP逐渐增大。结果表明，随着约束的放松，FHIP迅速下降，而随着霜冻率的增加，这种下降趋势变慢。发现随着霜冻率的增加，FHIP随指数函数而降低，并且FHIP表现出下降的幂律行为，其指数约为8/5。

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