Direct Measurement of CPT Sleeve-Sand Interface Coefficient of Friction
Haobo Zhao, Xingyi Wu, Alan Mcclenaghan, Mason Ghafghazi, Robert Cross, Jamie Sharp
In the proceedings of: GeoManitoba 2025: 78th Canadian Geotechnical Conference & 9th Canadian Permafrost ConferenceSession: Advanced Testing (Lab/Insitu) 2
ABSTRACT: The friction between cone penetrometers and soil affects Cone Penetration Test (CPT) tip resistance and sleeve friction. There is evidence in the literature that suggests the value is sensitive to the surface wear condition of the penetrometer and soil type. The interface coefficient of friction is a key input into numerical models of the CPT and may lead to improved interpretation. A friction cell was developed to measure the coefficient of friction between the friction sleeve and soil. Two dry sands were tested in the device and the interface sleeve friction was measured under different normal stresses and densities. Factors affecting the coefficient of friction were discussed along with potential sources of error in the test. The test was shown to be a practical tool for directly measuring interface coefficient of friction and eliminating an important source of uncertainty.
Please include this code when submitting a data update: GEO2025_325
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Cite this article:
Zhao, Haobo, Wu, Xingyi, Mcclenaghan, Alan, Ghafghazi, Mason, Cross, Robert, Sharp, Jamie (2025) Direct Measurement of CPT Sleeve-Sand Interface Coefficient of Friction in GEO2025. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Zhao_GEO2025_325,
author = {{Zhao, Haobo}, {Wu, Xingyi}, {Mcclenaghan, Alan}, {Ghafghazi, Mason}, {Cross, Robert}, {Sharp, Jamie}}
title = {Direct Measurement of CPT Sleeve-Sand Interface Coefficient of Friction }
booktitle = {Proceedings of the 78th Canadian Geotechnical Conference & 9th Canadian Permafrost Conference}
year = {2025}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Direct Measurement of CPT Sleeve-Sand Interface Coefficient of Friction }
booktitle = {Proceedings of the 78th Canadian Geotechnical Conference & 9th Canadian Permafrost Conference}
year = {2025}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }