Condition Assessment of a HWS Using Field Instrumentation and Electrical Resistivity Imaging (ERI)
Publication: Geo-Congress 2022
ABSTRACT
Highway Slopes (HWS) with fully and partially saturated high-plastic clay soil have typically been a source of frequent HWS vulnerability. Water infiltrates the slope after rains, lowering suction, decreasing shear, affects slope stability. Thus, it is critical to monitor the degree of saturation inside shallow depth in HWS. Field instrumentation (FI) as well as Electrical Resistivity Imaging (ERI) used to investigate the soil subsurface conditions in terms of soil moisture variation, sinkholes, cracks, and perched water zones. The current study intent to analyze ERI and FI to evaluate the performance of an HWS made of expansive Yazoo clay soil. Moisture content and water potential probes were installed at the crest, middle, and toe of the slope at different depths to monitor the moisture variations. Moreover, the 2D ERI test was conducted in two survey lines at the crest and middle of the slope to image the continuous soil subsurface profile in terms of moisture variation. Based on the FI and ERI data, the shallow depth of the HWS observed to have low resistivity, low-soil matric suction, high-volumetric moisture content, and perched water zone formation.
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Geo-Congress 2022
Pages: 102 - 112
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Published online: Mar 17, 2022
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