Coupled Hydro-Mechanical Analysis of Highway Slope on Expansive Soil Subjected to Rainfall

Nobahar, Masoud; Khan, Mohammad Sadik; Ivoke, John; Shuman, Nur Mohammad; Amini, Farshad

doi:10.1061/9780784483695.017

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…As a result, it can be inferred that the soil layers are completely saturated beyond the 10 ft (3 m) depth. Additionally, consistent with previous research on Yazoo clay HWS [25], rainfall water is retained in perched water zones at the shallow levels of the highplastic Yazoo clay HWS. Furthermore, water infiltration to deeper levels takes a significant period of time, leading to trapped perched water zones.…”

Section: Data Comparisonsupporting

confidence: 90%

“…This is likely possible when there is a formation of perched water conditions at the slope. It should be noted that the as-built section of HWS3 has experienced shallow movement starting in January 2019 [25]. In addition, it is evident from the instrumentation results that there is a presence of perched water conditions at the slope.…”

Section: Instrumentation Layoutmentioning

confidence: 89%

“…This study employed a practical calibration methodology [25]. At the HWS, undisturbed soil samples were gathered at various depths near the instrumentation locations.…”

Section: Soil Moisture Sensor Calibrationmentioning

confidence: 99%

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Development of Soil Moisture Content and Soil Matric Suction Model Based on Field Instrumentation and Electrical Resistivity Imaging (ERI) for Highway Slopes Constructed on High Expansive Clay Soil

et al. 2022

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In highway slopes (HWS) constructed on high expansive clay soil (HECS), in situ moisture variation is an environmentally driven variable that can significantly impact the safety of the constructed soil. Electrical resistivity imaging (ERI) is a non-destructive method with a considerable potential for subsurface soil moisture mapping, which can be correlated with volumetric soil moisture content (VSMC) and soil matric suction (SMS) of HECS to remarkably enhance the evaluation of the performance of the HWS. However, limited datasets are available to evaluate the accuracy and feasibility of the available correlative field-based models for the HECS under various field conditions. The objective of the current study is to develop a field-based model of VSMC and SMS using real-time field monitoring and ERI data. Six HWS located in the Jackson metro area in Mississippi (MS), USA were considered as reference slopes in this study. Comprehensive field instrumentation was executed at the six HWS to monitor the VSMC, SMS and rainfall intensity. The sensors were installed at the crest, middle and toe of the slope. The 2D ERI test was conducted using a dipole–dipole array with multiple electrodes at 5 ft (1.5 m) spacing. The ERI survey was conducted at the crest and middle of the six HWS to image the continuous soil subsurface profile in terms of moisture variation. The developed models indicated a good agreement between instrumented and ERI data. The developed models will facilitate the estimation of VSMC and SMS variations and aid in performance monitoring of the HWS built on HECS such as Yazoo clay.

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Section: Data Comparisonsupporting

confidence: 90%

Section: Instrumentation Layoutmentioning

confidence: 89%