A Preliminary Study on the Correlations Between Drilling Parameters and Pile Capacities-PPT Presentation

PPT Presentation

Pdf Summary

This preliminary study examines whether real-time investigative drilling (ID) data can help estimate pile capacities. The researchers compared drilling parameters with dynamic pile-test results for eight piles, including shaft resistance, toe resistance and total bearing capacity. The drilling dataset contained 2,237 observations of penetration rate, feed pressure, rotation pressure and flush pressure. They also assessed derived and normalized parameters, using averages over the pile shaft and around the pile base.<br /><br />Correlation analyses explored how these measures related to pile resistance and capacity. The clearest reported finding was that the reciprocal of penetration rate had a close-to-strong correlation with bearing capacity, suggesting that slower drilling may provide a useful indicator of stronger ground and greater pile capacity. The study also found potential in using drilling data more broadly to predict bearing capacity.<br /><br />Normalization methods adapted from cone penetration testing (CPT) were beneficial, but may not transfer directly to measurement-while-drilling (MWD) data. The authors conclude that drilling parameters could support quantitative site characterization and pile-capacity assessment, while emphasizing that the results are preliminary.<br /><br />Future work should examine pile load-transfer mechanisms, incorporate static load-test results, and use geotechnical domain knowledge to develop more suitable derived or normalized drilling parameters.

Keywords

real-time investigative drilling

pile capacity

dynamic pile test

bearing capacity

penetration rate

shaft resistance

toe resistance

measurement-while-drilling

correlation analysis

geotechnical characterization