United States Department of Transportation
i
Characterization of Soil and Rock for Transportation Infrastructure Using Seismic Methods in Wyoming
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2023-03-01
[PDF-8.39 MB]
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Edition:Final Report
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Abstract:WYDOT utilizes traditional soil borings, drive point analyses, rock coring methods, and lab investigations to identify and characterize the sub-surface soil. Previous experience with these traditional investigation techniques is good; however, current guidance from FHWA encourages the use on non-traditional investigation techniques. These can include a variety of subsurface methods and tools including seismic testing. This study included the data collection and analyses of compression wave and surface wave testing at nine sites throughout Wyoming. The compression wave testing yielded poor quality data and did not result in an ability to see many layers within the subsurface. However, the surface wave testing resulted in a measure of stiffness at each of the nine sites and was a very good predictor of the bedrock depth at each site, with eight of the nine sites in agreement between subsurface investigation and the pile driving records. Correlations between the shear wave velocity and shear strength, rock quality designation and percentage of rock recovered are very poor and yielded no useable correlation data. Lastly, the boundary between weathered and more competent bedrock could not be determined using any of the seismic methods.
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