New Method to Evaluate Strengthen Efficiency by Dynamic Compaction
Publication: International Journal of Geomechanics
Volume 20, Issue 4
Abstract
The tamping energy or tamping momentum usually is adopted to evaluate the efficiency of dynamic compaction (DC), meaning that the same tamping energy or tamping momentum leads to the same strengthening effect to the soil. This paper presented some new findings from field monitoring and numerical simulation of DC of granular soil. The phenomenon of particle breakage was taken into account for both large-scale field tests and the numerical study. A series of large-scale DC field tests was conducted with nine different combinations of hammer weight () and drop height (). The results showed that neither tamping energy nor tamping momentum controls the efficiency of dynamic compaction, which leads to overestimation the contribution of drop height. The findings were confirmed by numerical results in which the quantity was kept constant and was varied. It was found that the same compaction efficiency can be obtained when is about 0.2. A parameter is recommended to balance the contribution ratio of to . The findings from this study may benefit the engineering application and further research of DC.
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Acknowledgments
This research was supported by the National Key R&D Program of China (No. 2018YFB1600100), the Natural Science Foundation of China (Nos. 51722812 and 51908066), and the Natural Science Foundation of Hunan Province (No. 2017JJ1033).
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Published In
International Journal of Geomechanics
Volume 20 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Nov 1, 2018
Accepted: Jul 23, 2019
Published online: Feb 3, 2020
Published in print: Apr 1, 2020
Discussion open until: Jul 3, 2020
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