Yazoo clay soil is expansive in nature, and extended over central Mississippi, Alabama and Southern Louisiana. Shallow slope failures are frequent in embankments constructed on expansive Yazoo clay in Mississippi due to the rainfall volume and climatic variation. The current study investigates the effect of rainfall over the factor of safety of fill slopes constructed with Yazoo clay soil using the finite element method (FEM). The historical rainfall pattern of Mississippi obtained from the National Oceanic and Atmospheric Administration (NOAA), is evaluated at different intensities (2 to 50 mm/h), and durations of rainfall (30 min to 7 days) with the data being, based on a return periods of 50, 100, and 500 years. Three fill slopes were constructed using Yazoo clay soil, with a slope ratios of 2H: 1V, 3H: 1V, and 4H: 1V. The rainfall pattern is applied over the top boundary of the slope in Plaxis, using flow analysis. The preliminary investigation results indicated that rainfall water infiltrated the top part of the slope, near the crest, resulting in the reduction of both the matric suction and the factor of safety of the slope. Moreover, the factor of safety of the slope is directly influenced by the total rainfall volume, regardless of the intensity and duration.
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机译：Yazoo黏土在性质上是膨胀的，并延伸到密西西比州中部，阿拉巴马州和路易斯安那州南部。由于降雨量和气候变化，密西西比州在膨胀的Yazoo粘土上建造的路堤经常发生浅层边坡破坏。目前的研究使用有限元方法研究降雨对Yazoo粘土土填筑边坡安全系数的影响。从美国国家海洋和大气管理局（NOAA）获得的密西西比州的历史降雨模式，是在不同强度（2至50 mm / h）和降雨持续时间（30分钟至7天）的基础上进行评估的，数据基于返回期分别为50年，100年和500年。使用Yazoo粘土构造了三个填充坡度，坡度比为2H：1V，3H：1V和4H：1V。使用流量分析，将降雨模式应用到Plaxis斜坡的顶部边界上。初步调查结果表明，降雨水渗透到斜坡顶部附近的顶部，导致矩阵吸力和斜坡安全系数均降低。此外，不论强度和持续时间如何，斜坡的安全系数直接受到总降雨量的影响。
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