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Mapping Subsurface Conditions for Transportation Applications
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2022-09-01
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[PDF-52.43 MB]
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Edition:Final Report 01/2019 - 09/2022
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Abstract:Geophysical methods including Multichannel Analysis of Surface Waves (MASW) using both Rayleigh and Love waves, P-wave refraction, Horizontal to Vertical Spectral Ratio (HVSR), Capacitively-Coupled Resistivity (CCR), Electrical Resistivity Tomography (ERT), Ground Penetration Radar (GPR), and Electromagnetic Ground Conductivity (EM31) were used for bedrock mapping and slope stability investigations for several ARDOT transportation projects. In Phase I, all geophysical methods were applied for two ARDOT test sites to investigate the advantages and limitations of each method. Based on the performance of each method in Phase I, the potential non-invasive geophysical methods best suited for slope stability investigations and bedrock mapping were identified. These methods were then implemented in Phase II for several ongoing ARDOT transportation projects. For slope stability with a shallow and complex bedrock topography, which is the case for most ARDOT projects, a combination of HVSR, MASW, and ERT or P-wave refraction was observed to be viable. For such sites, a 3D image of bedrock topography is a key factor required for the development of a detailed slope stability model. In this regard, the HVSR is proposed as an effective tool when used in conjunction with other geophysical methods to create a 3D map of bedrock topography in a simple, rapid, cost-effective, and accurate manner.
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