United States Department of Transportation
i
Advanced Geophysical Tools for Geotechnical Analysis: Final Report
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2021-09-01
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[PDF-20.13 MB]
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Edition:June 2019–August 2021
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Abstract:Texas Department of Transportation (TxDOT) encounters a considerable and yet increasing number of claims and change orders every year that negatively affects project costs and schedules. Insufficient and inaccurate information about the subsurface condition is a critical factor contributing to these cost overruns and delays. The annual cost of change orders resulting from insufficient subsurface information is commonly in order of millions of dollars. This lack of sufficient information is primarily due to the inherent limitation of the conventional geotechnical site investigation methods to provide continuous assessment of subsurface conditions. The primary objectives of this research project were to (1) develop an easy-to-use comprehensive manual that provides TxDOT staff with the Electrical Resistivity Imaging (ERI) technique procedures and guidelines for safe and correct implementation of ERI technology, (2) develop sets of equations and charts to investigate the relationship between the soil electrical resistivity and geotechnical properties in Texas, (3) demonstrate the ERI technique in the five TxDOT districts to cover different geotechnical conditions and operational environments, (4) create easy-to-use and instructive text and video training materials for learning workshops and provide TxDOT staff with information about the ERI survey, data collection, and data processing, and (5) perform training workshops in the TxDOT districts to convey the information about the ERI technology and share the research project’s findings. The ERI technology provides a unique opportunity to reduce the cost overruns and delays related to inadequate subsurface information by providing (1) continuous subsurface images along with estimated soil properties and potential anomalies (e.g., karst, void) between the boreholes, and (2) additional information about the required drilling and sampling intervals.
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