Observations and Impact of Field Logging and Drilling Procedures on Site Characterization of Cambridge Argillite in Somerville, MA

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Abstract: This paper presents key observations from a geotechnical investigation (GI) program conducted within an active rail corridor in Somerville, MA. The investigation involved borehole drilling with standard penetration tests (SPT) to identify subsurface conditions. The GI program was carefully developed based on a thorough review of available existing geotechnical and geologic information for the area with an emphasis on accurate in-situ site characterization through best-practice field logging, drilling procedures and laboratory testing. The primary bedrock formation encountered in the region was the Cambridge Argillite which has been known to be highly variable spatially and geotechnical properties. Field observations and laboratory testing showed that the formation is highly sensitive to moisture content and the impact of drilling on drilled shaft side shear resistance should be considered. The primary conclusions were that in-situ moisture preservation of the bedrock and the remolded shear strength of the completely weathered bedrock is critical for accurate geotechnical site characterization for design.

Mr. Udit Shankar Dasgupta; Dr. ANDREW KEENE

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