The Effects of Soil Suction on Shallow Slope Stability
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2013-07-04
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Abstract:This study investigates the slope failures associated with clayey soils so engineers can better understand the problem and better predict shallow slope stability, and implement preventive measures if necessary. This research also examines the mechanics of the soil as related to matric suction changes, soil type, desiccation crack formation and expected degree of wetting. Research involves studying at least two field cases where shallow slope instability has been a problem; one case involves a cut slope section and one case involves an embankment slope. There are three primary objectives of the proposed research: 1) To provide geotechnical engineers with a method for predicting stability of cut slopes and embankment slopes composed of unsaturated soil, incorporating soil moisture condition and suction into the analysis. 2) To provide geotechnical engineers with methods for predicting changes in soil moisture conditions and suction in slopes as a function of climate changes so that a proper “design moisture condition” can be selected. This will also allow for predicting the slope stability over time based on predicted moisture content changes. 3) To provide recommendations to minimize the climate impacts on slope stability including, as necessary, reducing adverse impacts of desiccation cracking in clayey materials. Successful completion of this research will provide engineers with tools for improved analysis of shallow slope stability and recommendations for preventing landslides. The research involves field testing and monitoring of suction and moisture content, laboratory testing of unsaturated and saturated strength and flow properties, moisture diffusion modeling based on climate data, investigation of desiccation cracking and its impact on slope stability, and stability analyses. Completed research will have a positive impact on geotechnical practice related to transportation corridors. This report represents a summary of progress during the first half of the project that was partly supported by OkTC funding.
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