Expansive soils are subjected to shrink-swell behavior with moisture variation in Mississippi, United States. With successive moisture and temperature variations over the seasons, the hydraulic conductivity of expansive soil is subjected to change because of the development of shrinkage cracks, which can be as large as as 1.2 cm wide and 1.5 m deep in the field, affecting the vertical hydraulic conductivity (Kv), whereas the horizontal hydraulic conductivity (Kh) remains fairly constant. The current study intends to investigate the hydraulic conductivity of highly expansive Yazoo clay at different wet-dry cycles. To observe the changes in the hydraulic conductivity with different wet-dry cycles in the laboratory, an instantaneous profile method to measure the permeability was utilized. Compacted Yazoo clay samples at different initial moisture content instrumented with moisture sensors at different depths to monitor changes in the moisture content were investigated. The samples were subjected to one, two, and three numbers (1N, 2N, and 3N) of wetting and drying cycles. For the drying process, testing chambers are kept in a controlled high-temperature booth of about 37°C simulating high summer temperatures in Mississippi. After the end of the wet-dry cycles, the test is performed to investigate the changes in the hydraulic conductivity of soil with the presence of shrinkage cracks. The hydraulic conductivity of highly plastic clay is very low at a fully compacted state and was observed to be (1.0×10^-8 cm/s) at the 1N wetting phase. However, with an increment in the wet-dry cycles, the Kv of Yazoo clay increases (3.70×10^-4 cm/s) after the sample is exposed to three wet-dry cycles. Even though the changes in the Kv of highly plastic clay define the infiltration behavior, which mostly controls the slope failure and pavement distress, consideration of the climatic loads is ignored in the design phase of the highway embankment and levees. By inclusion of the climatic variation, and evaluating the performance, the design life and resilience of the structures can be significantly increased

在美国密西西比州，膨胀土会随着湿度变化而发生收缩膨胀行为。随着季节水分和温度的连续变化，膨胀土的导水率因收缩裂缝的发展而发生变化，收缩裂缝可大至田间1.2 cm宽和1.5 m深，影响垂直水力传导率 (Kv)，而水平水力传导率 (Kh) 保持相当恒定。目前的研究旨在研究高膨胀性 Yazoo 粘土在不同干湿循环下的水力传导率。为了观察实验室不同干湿循环下水力传导率的变化，采用瞬时剖面法测量渗透率。研究了不同初始水分含量的压实 Yazoo 粘土样品，在不同深度安装了水分传感器以监测水分含量的变化。样品经历了一个，两个和三个数量（1N，2N和3N）的润湿和干燥循环。在干燥过程中，测试室被保存在模拟密西西比州夏季高温的受控高温室中，温度约为 37°C。在干湿循环结束后，进行测试以研究存在收缩裂缝时土壤导水率的变化。在完全压实状态下，高塑性粘土的水力传导率非常低，观察到为（1.0×10 对样品进行 1、2 和 3 次（1N、2N 和 3N）的润湿和干燥循环。在干燥过程中，测试室被保存在模拟密西西比州夏季高温的受控高温室中，温度约为 37°C。在干湿循环结束后，进行测试以研究存在收缩裂缝时土壤导水率的变化。在完全压实状态下，高塑性粘土的水力传导率非常低，观察到为（1.0×10 对样品进行 1、2 和 3 次（1N、2N 和 3N）的润湿和干燥循环。对于干燥过程，将测试室放置在约37°C的受控高温棚内，模拟密西西比州的夏季高温。在干湿循环结束后，进行测试以研究存在收缩裂缝时土壤导水率的变化。在完全压实状态下，高塑性粘土的水力传导率非常低，观察到为（1.0×10 进行该测试是为了研究存在收缩裂缝时土壤导水率的变化。在完全压实状态下，高塑性粘土的水力传导率非常低，观察到为（1.0×10 进行该测试是为了研究存在收缩裂缝时土壤导水率的变化。在完全压实状态下，高塑性粘土的水力传导率非常低，观察到为（1.0×10^-8  cm / s）在1N的润湿阶段。然而，随着干湿循环的增加 ，样品暴露于三个干湿循环后，Yazoo粘土的Kv增加（3.70×10 ^-4 cm/s）。尽管高塑性粘土 Kv 的变化定义了渗透行为，主要控制边坡破坏和路面破坏，但在公路路堤和堤防的设计阶段忽略了气候载荷的考虑。通过考虑气候变化并评估性能，可以显着提高结构的设计寿命和弹性