OasisLMS

Abstract: A Measurement While Drilling (MWD) system was recently implemented as part of routine geotechnical investigations conducted by the New Hampshire Department of Transportation (NHDOT). Equipment setup, test procedures, and data collection methods were iteratively refined throughout an experimental campaign across 14 sites, comprising a total of approximately 40 boreholes. MWD profiles were analysed in conjunction with Standard Penetration Tests (SPT) and Piezocone tests (CPTu) to evaluate their effectiveness in delineating stratigraphic transitions and interpreting subsurface conditions. Initial results demonstrate that MWD data can provide valuable insights into subsurface variability, offering a continuous representation of drilling conditions that enhances site characterization beyond the discrete sampling of SPT. Lessons learned during the study highlight the importance of integrating additional site-specific information, such as drill bit type, operator-controlled drilling adjustments, and soil cuttings observations to enhance data interpretation, especially when an SPT profile is not available. Additionally, challenges in data collection and analysis highlight the need for standardized procedures to improve the consistency and usability of MWD data. This paper provides practical guidance for current and prospective MWD users and presents a discussion of challenges currently faced as MWD data analysis techniques are continually developed and improved.

Dr. Bruma Souza; Mr. JEAN BENOIT

International Conference Proceedings