Influence of different drill pipe diameters on the blow count of SPT

Li Zhipeng; Li Hao; Long Tao; Luo Zhongxu; Wang Heping

doi:10.20265/j.cnki.issn.1007-2993.2024-0312

Volume 39 Issue 5

Oct. 2025

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Article Navigation > GEOTECHNICAL ENGINEERING TECHNIQUE > 2025 > 39(5): 760-765

Li Zhipeng, Li Hao, Long Tao, Luo Zhongxu, Wang Heping. Influence of different drill pipe diameters on the blow count of SPT[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 760-765. doi: 10.20265/j.cnki.issn.1007-2993.2024-0312

Citation:

Li Zhipeng, Li Hao, Long Tao, Luo Zhongxu, Wang Heping. Influence of different drill pipe diameters on the blow count of SPT[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 760-765. doi: 10.20265/j.cnki.issn.1007-2993.2024-0312

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Influence of different drill pipe diameters on the blow count of SPT

doi: 10.20265/j.cnki.issn.1007-2993.2024-0312

China Railway Design Corporation, Tianjin 300251, China

Received Date: 2024-07-10
Accepted Date: 2024-10-29
Rev Recd Date: 2024-09-29
Publish Date: 2025-10-10

Abstract

Abstract

The ϕ50 drill pipe is increasingly being used in standard penetration tests. However, there is no clear guidance in the specifications on whether and how to convert the blow count N value of the standard penetration tests obtained by the ϕ50 drill pipe when distinguishing the characteristics of rock and soil engineering. A comparative study was conducted on standard penetration tests with different drill pipe diameters at a site in Zhanjiang City. Statistical analysis was conducted on the relevant data, and the results showed that there was a significant correlation between the blow count of standard penetration tests and the drill pipe diameter, and the ratio of blow counts between different drill pipe diameters was related to the soil type and test depth. The blow counts of the ϕ42 drill pipe in sandy soil formations is less than that of the ϕ50 drill pipe, with an overall ratio of 0.89. The ratio of the two at different depths ranges from 0.83 to 1.01. As the test depth increases, the ratio of the blow counts shows a trend of first increasing and then decreasing. The blow counts of the ϕ42 drill pipe in the cohesive soil layer is greater than that of the ϕ50 drill pipe, and the overall ratio of the two is 1.14. The ratio of the two at different depths is 1.11~1.20. As the test depth increases, the ratio of the blow counts remains basically unchanged. The research results can provide reference for regional experience accumulation and engineering practice.
- geotechnical investigation,
- standard penetration test (SPT),
- drill pipe diameter,
- standard penetration blow count

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References(19)

References

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Influence of different drill pipe diameters on the blow count of SPT

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