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Seismic and Electrical 3D Imaging to Aid in Landslide Remediation Design, East Fork Landslide, Wolf Creek Pass, Colorado
3D geophysical investigations were performed on an active landslide in southwestern Colorado, south of Highway 160 on the west side of Wolf Creek Pass. The landslide impacted a major natural gas line and forced the closure of an important forest access road. Two geophysical methods, seismic and electrical, were selected to optimize subsurface volumetric evaluation and supplement conventional geotechnical field investigations. The primary purpose of this study was to evaluate the value of wide-area surface geophysical surveys using new 3D technologies to better characterize the landslide mass and improve remediation designs. The purpose and project objectives were met with this study. Results indicate the 3D seismic survey delineated soft materials within the landslide mass and the landslide slip plane depth, as it correlated with borehole results. 3D electrical resistivity results, when compared to areas outside the most recent movement of the landslide and borehole results, showed anomalies of lower resistance that correlate well with areas of higher water content. In addition, 3D-induced polarization results indicate materials within the landslide mass have high chargeability, which appears to correlate with higher clay content.
Seismic and Electrical 3D Imaging to Aid in Landslide Remediation Design, East Fork Landslide, Wolf Creek Pass, Colorado
3D geophysical investigations were performed on an active landslide in southwestern Colorado, south of Highway 160 on the west side of Wolf Creek Pass. The landslide impacted a major natural gas line and forced the closure of an important forest access road. Two geophysical methods, seismic and electrical, were selected to optimize subsurface volumetric evaluation and supplement conventional geotechnical field investigations. The primary purpose of this study was to evaluate the value of wide-area surface geophysical surveys using new 3D technologies to better characterize the landslide mass and improve remediation designs. The purpose and project objectives were met with this study. Results indicate the 3D seismic survey delineated soft materials within the landslide mass and the landslide slip plane depth, as it correlated with borehole results. 3D electrical resistivity results, when compared to areas outside the most recent movement of the landslide and borehole results, showed anomalies of lower resistance that correlate well with areas of higher water content. In addition, 3D-induced polarization results indicate materials within the landslide mass have high chargeability, which appears to correlate with higher clay content.
Seismic and Electrical 3D Imaging to Aid in Landslide Remediation Design, East Fork Landslide, Wolf Creek Pass, Colorado
Sirles, Phil (author) / Haramy, Khamis (author) / Andrew, Rick D. (author) / Surdahl, Roger W. (author)
Biennial Geotechical Seminar 2012 ; 2012 ; Denver, Colorado, United States
GeoChallenges ; 76-89
2012-11-09
Conference paper
Electronic Resource
English
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