Miniature Cone Tip Resistance on Sand in a Centrifuge
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 3
Abstract
Miniature cone penetration tests were conducted in centrifuge models to investigate the effects of various testing conditions on the tip resistance including the particle size, centrifugal acceleration related to stress level and prototype cone diameter, container wall boundary, and penetration rate. Two sand materials were selected: (1) Saemangeum and (2) silica sands. The former is natural sand with high fine contents and the latter is clean sand. A series of penetration tests was performed in six saturated soil models using an in-flight robot. Three Saemangeum sand models were prepared by means of the moist compaction method. The silica sand models were made by the air-pluviation method. Modeling of models was adopted to investigate the particle size effect using 7-, 10-, and 13-mm-diameter cones. The centrifugal acceleration effect also was studied by comparing the tip resistance profiles obtained at different g-levels using the 10-mm-diameter miniature cone. The results indicated that the particle size effect was negligible for both sands using 7- to 13-mm-diameter cones. However, the tip resistance decreased with increasing g-level at a shallower depth than a given critical depth (), especially for dense sand. Then, it merged to a single value at a deeper depth than . The was affected by g-level and soil density. Finally, an empirical correlation to estimate the soil density from the tip resistance in the centrifuge was proposed.
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Acknowledgments
This study was supported by a grant from Korea Institute of Construction and Transportation Technology Evaluation and Planning (KICTTEP) funded by Ministry of Land, Transport, and Maritime Affairs (MLTM) R&D program (10-CTIP-E04); and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (Grant number 2009-0080575). This work also was supported by the Technology Innovation Program (Project number 10042556), Core Technology Development for Deepwater O&G Production System FEED Engineering & Floating Systems funded by the Ministry of Trade, Industry & Energy (MTIE), Korea. The authors also gratefully acknowledge the KREONET service provided by Korea Institute of Science and Technology Information.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 3 • March 2016
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© 2015 American Society of Civil Engineers.
History
Received: Nov 20, 2014
Accepted: Aug 31, 2015
Published online: Nov 30, 2015
Published in print: Mar 1, 2016
Discussion open until: Apr 30, 2016
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