Effect of Secondary Impacts on SPT Rod Energy and Sampler Penetration
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 3
Abstract
This paper explores the standard penetration test (SPT) hammer-anvil behavior and investigates the effect of secondary impact on SPT energy and sampler penetration. It is observed that the hammer-anvil behavior after the impact depends on the characteristics of the wave reflected from the sampler. The type-I secondary impact, which is dominant for , is induced due to the rapid downward movement of the anvil and the recontact of the following hammer on the rebounding anvil. The maximum energy calculated by integrating force and velocity (EFV) is achieved immediately after the occurrence of the type-I secondary impact and an additional sampler penetration is triggered by the type-I secondary impact. The type-II secondary impact, which is dominant for , is produced by the restrike of the pushed-up hammer on the resting anvil. The type-II secondary impact causes only recoverable anvil deformation and does not contribute to the maximum EFV energy. For -values of 25–50, both or either types of secondary impacts happen. As -value increases, the type-I secondary impact fade away progressively and the type-II secondary impact becomes more distinctive.
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Acknowledgments
This research was supported by Grant No. UNSPECIFIED06-R&D-B05 from the Construction Technology Innovation Program funded by the Min-istry of Land, Transport and Maritime Affairs of Korean Government. It was also supported by a Korea University Grant.UNSPECIFIED
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 136 • Issue 3 • March 2010
Pages: 522 - 526
Copyright
© 2010 ASCE.
History
Received: Oct 25, 2007
Accepted: Aug 31, 2009
Published online: Sep 2, 2009
Published in print: Mar 2010
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