Investigating the Frost Action in Soils
Investigating the Frost Action in Soils
复制标题
DOI：
10.1061/9780784484067.027
复制
发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Mohammad Wasif Naqvi;Md Fyaz Sadiq;B. Cetin;M. Uduebor;J. Daniels
中科院分区：
文献类型：
--
作者：
Mohammad Wasif Naqvi;Md Fyaz Sadiq;B. Cetin;M. Uduebor;J. Daniels
冻胀导致美国和世界各地的道路、埋地管道和冷藏设施出现系统性故障。当满足以下三个条件时，可能会发生严重冻胀：(1) 存在持续的冰冻条件，(2) 土壤易受霜冻影响（通常为淤泥大小），以及 (3) 有水源。在这些条件下，根据温度梯度，孔隙水冻结成冰透镜，冰透镜朝热损失的方向生长，从而引起隆起。当春季气温升高时，冰融化导致解冻沉降，导致土壤强度降低。冻胀的性质和程度根据水的可用性、孔隙流体成分、热损失率和土壤类型而变化。同样，土壤特性会影响水被吸引到不断生长的冰透镜体上的速率以及冰形成的温度。实验室测试可以辨别冻结强度和持续时间以及土壤特性（包括矿物学、粒度分布和孔隙流体）的重要性。作为更大的全国项目的一部分，当前的研究评估了从阿拉斯加、爱荷华州和北卡罗来纳州收集的土壤的冻胀潜力。圆柱形土壤样品可以自由接触水并进行两次冻融循环。测量总起伏、起伏速率、温度剖面、霜冻渗透深度及其速率随时间的变化。还测量了测试期间的饮水量。研究结果表明，土壤中粉砂量和粘土含量对冻胀现象有直接影响。淤泥含量较高且粘土含量较低的土壤具有较高的隆起性。经确定，所有土壤都高度易受霜冻影响，并且隆起率高达 28.4 毫米/天。最大霜冻深度和霜冻渗透率分别为 114 毫米和 260 毫米/天。
Frost heave creates systemic failures in roadways, buried pipelines, and cold storage facilities across the United States and around the world. Significant frost heaving may occur when the following three conditions are met: (1) there are sustained freezing conditions, (2) the soil is frost-susceptible (typically silt-sized), and (3) there is access to water. Under these conditions and depending on the temperature gradient pore water freezes into ice lenses that grow in the direction of heat loss, causing heave. When the temperature increases during the spring season, the ice melts inducing thaw settlement and causing a reduction in soil strength. The nature and extent of frost heave vary according to the availability of water, pore fluid composition, rate of heat loss, and soil type. Similarly, soil properties influence the rate at which water is attracted to a growing ice lens and the temperature at which ice formation occurs. Laboratory tests can discern the significance of freezing intensity and duration as well as soil properties, including mineralogy, grainsize distribution, and pore fluid. As part of a larger nationwide project, the current study evaluates the frost heave potential of soils collected from Alaska, Iowa, and North Carolina. Cylindrical soil samples were given free access to water and subjected to two freeze-thaw cycles. Total heaving, heave rate, temperature profile, frost penetration depth, and its rate were measured as a function of time. Water intake during testing was also measured. The results of the study showed that amount of silt and clay content in the soil have a direct effect on the frost heave phenomenon. Soils that have higher silt content and less clay content had higher heaving. It was determined that all the soils were highly frost susceptible and had high-heave rates up to 28.4 mm/day. The maximum frost penetration depth and frost penetration rate were 114 mm and 260 mm/day, respectively.