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Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
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2024-09-01
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[PDF-15.78 MB]
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Edition:Final Report
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Abstract:This report summarizes the research conducted using Measurement While Drilling (MWD) technology that was recently implemented as part of routine geotechnical investigations conducted by the New Hampshire Department of Transportation (NHDOT). MWD is a system that consists of several sensors directly mounted or connected to a drill rig to monitor all aspects of geotechnical borehole drilling. These sensors record advance rate, rotation rate, downthrust (pressure and force), torque, water/mud flow, water/mud pressure, and vibration. These measurements are obtained in real-time at vertical intervals of 5 cm without interfering with routine drilling operations. Equipment setup on an NHDOT drill, 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 analyzed in conjunction with conventional methods such as the Standard Penetration Tests (SPT), the Piezocone, and Rock Quality Designation (RQD) to evaluate their effectiveness in delineating stratigraphic transitions and interpreting subsurface conditions. Results demonstrated that MWD data can provide valuable insights into subsurface variability, soil and rock types, presence of fractures, as well as potential for correlations with geotechnical properties. MWD offered a continuous representation of drilling conditions that enhanced site characterization beyond the discrete sampling offered by tests such as the 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. Additionally, challenges in data collection and analysis highlight the need for standardized procedures to improve the consistency and usability of MWD data.
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