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Evaluation of rainfall induced moisture variation depth in highway embankment made of Yazoo clay
Transportation Geotechnics ( IF 5.3 ) Pub Date : 2021-06-09 , DOI: 10.1016/j.trgeo.2021.100602
M.S. Khan , M. Nobahar , M. Stroud , F. Amini , J. Ivoke

Yazoo clay is highly plastic and has been associated in Mississippi with swelling problems and causes significant maintenance problems to the highway slopes. The infiltration of rainwater may create a perched water condition within the slopes, which may reduce the shear strength of the soil at the vadose zone. However, limited data is available on the wetting depth of highway slopes constructed on Yazoo clay in Mississippi. The objective of the current study is to determine the active moisture variation zone of highway embankment slopes constructed on Yazoo clay soil in Jackson, Mississippi. In this study, three highway slopes in the Jackson metroplex were considered as referenced slopes, which were monitored by using a rain gauge, moisture sensors, water potential probes in each slope. At each slope, sensors are installed at three different depths (1.5 m (5 ft.), 3 m (10 ft.), and 5 m (15 ft.)) at the crest, middle, and toe of the slope. The 3D flow analysis was also conducted using the Finite Element Method (FEM) in Plaxis 3D. The depth of moisture variation of the highway slopes was determined based on simulation of the unsaturated moisture flow and saturation of the slope existing soil test data and field instrumentation results. The field monitoring data indicated that the highest infiltration occurred at the crest of the slope, and the moisture variation zone continues up to 3.5 m (12 ft.). The 3D analysis showed that with the low-intensity long-duration rainfall, the progressive rainfall saturated the near-surface soil.



中文翻译:

Yazoo粘土公路路堤降雨引起的水分变化深度评价

Yazoo 粘土具有高度可塑性,在密西西比州与膨胀问题有关,并导致高速公路斜坡出现严重的维护问题。雨水的入渗可能会在斜坡内形成滞水状态,这可能会降低包气带土壤的剪切强度。然而,关于密西西比州 Yazoo 粘土上建造的公路边坡的润湿深度的数据有限。当前研究的目的是确定在密西西比州杰克逊的 Yazoo 粘土上建造的公路路堤边坡的活跃水分变化带。在这项研究中,杰克逊都会区的三个高速公路斜坡被视为参考斜坡,通过使用雨量计、湿度传感器、每个斜坡的水势探头进行监测。在每个斜坡上,传感器安装在坡顶、中间和坡脚的三个不同深度(1.5 m (5 ft.)、3 m (10 ft.) 和 5 m (15 ft.))。3D 流动分析也是在 Plaxis 3D 中使用有限元方法 (FEM) 进行的。公路边坡水分变化深度是根据边坡现有土壤试验数据和现场仪器测量结果对非饱和水分流动和饱和度的模拟确定的。现场监测数据表明,最高入渗发生在坡顶,水分变化带持续达 3.5 m (12 ft.)。3D分析表明,随着低强度长时间降雨,渐进式降雨使近地表土壤饱和。3D 流动分析也是在 Plaxis 3D 中使用有限元方法 (FEM) 进行的。公路边坡水分变化深度是根据边坡现有土壤试验数据和现场仪器测量结果对非饱和水分流动和饱和度的模拟确定的。现场监测数据表明,最高入渗发生在坡顶,水分变化带持续达 3.5 m (12 ft.)。3D分析表明,随着低强度长时间降雨,渐进式降雨使近地表土壤饱和。3D 流动分析也是在 Plaxis 3D 中使用有限元方法 (FEM) 进行的。公路边坡水分变化深度是根据边坡现有土壤试验数据和现场仪器测量结果对非饱和水分流动和饱和度的模拟确定的。现场监测数据表明,最高入渗发生在坡顶,水分变化带持续达 3.5 m (12 ft.)。3D分析表明,随着低强度长时间降雨,渐进式降雨使近地表土壤饱和。公路边坡水分变化深度是根据边坡现有土壤试验数据和现场仪器测量结果对非饱和水分流动和饱和度的模拟确定的。现场监测数据表明,最高入渗发生在坡顶,水分变化带持续达 3.5 m (12 ft.)。3D分析表明,随着低强度长时间降雨,渐进式降雨使近地表土壤饱和。公路边坡水分变化深度是根据边坡现有土壤试验数据和现场仪器测量结果对非饱和水分流动和饱和度的模拟确定的。现场监测数据表明,最高入渗发生在坡顶,水分变化带持续达 3.5 m (12 ft.)。3D分析表明,随着低强度长时间降雨,渐进式降雨使近地表土壤饱和。

更新日期:2021-06-17
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