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首页> 外文会议>Pan-American conference on unsaturated soils >Understanding Shallow Slope Failures on Expansive Soil Embankments in North Texas Using Unsaturated Soil Property Framework
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Understanding Shallow Slope Failures on Expansive Soil Embankments in North Texas Using Unsaturated Soil Property Framework

机译：使用非饱和土壤属性框架了解北德克萨斯膨胀土路堤的浅层边坡破坏

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Slopes constructed with expansive soils are prone to shallow slope failures when subjected to seasonal wetting-drying. This article presents a field experimental study and corresponding modeling analysis to understand slope failures at shallow depths, typically ranging from 1 to 5 ft (0.3-1.5 m) from the surface. Previous studies (Brand 1981; Cho et al. 2002; Chen et al. 2004) revealed that the major cause of shallow slope failures for earthen dams is due to the formation of surficial cracks due to rapid matric suction change occurring during cyclic wetting-drying from seasonal changes. The purpose of this study is to identify the influential factors such as soil matric suction on the stability of unsaturated soil slopes. In this study, soil from a test section at Joe Pool Lake dam, Texas is considered. Test soil was subjected to basic soil characterization and later studied for their engineering behavior. Unsaturated soil properties for Joe Pool Lake soil are obtained by evaluating the soil water characteristic curve (SWCC) using pressure cell and filter paper technique. Rainfall and temperature data collected at the site were utilized for modeling the unsaturated condition of the slope using VADOSE/W software. Results showed that consistent matric suction variation contributed to the reduction in the stability of the slopes. This analysis also provided valuable insight into the formation of fully softened zones at shallow depths due to the formation of desiccation cracks.
机译：当季节性湿润干燥时，用膨胀土建造的边坡容易发生浅层边坡破坏。本文介绍了一项现场实验研究和相应的模型分析，以了解通常在距地面1至5英尺（0.3-1.5 m）的浅深度处的边坡破坏。先前的研究（Brand 1981; Cho等，2002; Chen等，2004）表明，土坝浅层边坡失稳的主要原因是由于表面的裂缝形成，这是由于在循环干湿过程中快速的基质吸力变化而形成的。从季节性变化。这项研究的目的是确定诸如土壤基质吸力等对非饱和土边坡稳定性的影响因素。在这项研究中，考虑了得克萨斯州乔普尔湖大坝试验段的土壤。对测试土壤进行了基本的土壤表征，并随后对其工程行为进行了研究。通过使用压力盒和滤纸技术评估土壤水分特征曲线（SWCC），获得乔池湖土壤的非饱和土壤特性。利用VADOSE / W软件，利用现场收集的降雨和温度数据对边坡的非饱和条件进行建模。结果表明，一致的基质吸力变化有助于降低边坡的稳定性。该分析还为形成干燥裂纹而在浅深度形成完全软化的区域提供了有价值的见识。

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