Effects of transient temperature gradient on frost heave of saturated silty clay in an open system

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL Research in Cold and Arid Regions Pub Date : 2023-12-01 Epub Date: 2023-11-28 DOI:10.1016/j.rcar.2023.11.005

HongYan Ma , YuanFang Cui , JianQiao Zhang , Song Li , Song Xu

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Abstract

Frost heave in seasonally frozen regions is a one-dimensional process that could severely damage infrastructure subgrades. Stress state, temperature and water migration are important factors for frost heave. This work investigated the effects of soil temperature and volumetric water content on the transient frost heave ratio during the freezing of saturated silty clay in an open system and analyzed the relationships between the transient frost heave ratio and freezing rate and between temperature gradient and frost heave rate. The results show that the frost heave ratio, frost heave rate, and freezing rate are positively correlated with the temperature gradient since the temperature gradient drives the water migration during freezing, indicating the transient temperature gradient could be used to evaluate the frost heave of saturated silty clay. The transient freezing rate and transient frost heave ratio are logarithmically related to the transient frost heave ratio and transient temperature gradient, respectively. The effects of transient temperature gradient on frost heave are the principal mechanism responsible for different frost heave characteristics and uneven frost heave along a subgrade of the same soil type.

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瞬态温度梯度对开放系统中饱和淤泥质粘土冻胀的影响

季节性冻土区的冻胀是一个一维过程，可能会严重破坏基础设施路基。应力状态、温度和水分迁移是引起冻胀的重要因素。研究了开放体系饱和粉质粘土冻结过程中土壤温度和体积含水量对瞬态冻胀率的影响，分析了瞬态冻胀率与冻结速率、温度梯度与冻胀率之间的关系。结果表明：冻胀率、冻胀率和冻结率与温度梯度呈正相关，温度梯度驱动冻结过程中水的迁移，表明瞬态温度梯度可用于评价饱和粉质粘土的冻胀；瞬态冻胀率和瞬态冻胀率分别与瞬态冻胀率和瞬态温度梯度成对数关系。瞬态温度梯度对冻胀的影响是造成同一土质路基不同冻胀特征和不均匀冻胀的主要机制。

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Research in Cold and Arid Regions

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