Journal Published Online: 24 July 2020
Volume 44, Issue 3

Investigation into Effect of Sonic Drilling Methodology on Standard Penetration Test Results in Dense Sand

CODEN: GTJODJ

Abstract

An extensive field investigation was conducted to quantify the variation between drilling methodologies on the SPT outputs (SPT-N60 values) in dense saturated sands. For this experiment, a test site with reasonably consistent soil properties was identified, where multiple standard penetration tests (SPTs) were conducted using four drilling methodologies, including rotary core, direct push, and two sonic drilling methods. Considering the rotary core as the benchmark, the SPT-N values obtained from this method were systematically compared with those from the other three drilling methodologies. For the dense saturated sands studied in this research, the SPT-N values from rotary sonic DT-45 showed the closest correlation to the SPT-N values from the rotary core, with about 15% variation. The variation was shown not to be statistically significant, considering the inherent variability of the SPT and the measured confidence interval of the SPT-N values from the standard rotary core method.

Author Information

Watkins, Tania
Department of Engineering and Architectural Studies, Ara Institute of Canterbury (Christchurch Polytechnic), Christchurch, New Zealand
Askarinejad, Hossein
Department of Engineering and Architectural Studies, Ara Institute of Canterbury (Christchurch Polytechnic), Christchurch, New Zealand
Yeo, John
Department of Engineering and Architectural Studies, Ara Institute of Canterbury (Christchurch Polytechnic), Christchurch, New Zealand
Pages: 9
Price: $25.00
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Stock #: GTJ20190249
ISSN: 0149-6115
DOI: 10.1520/GTJ20190249