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Field tests on the effects of diameter of drill pipe on number N of SPT

NIE Qing-ke 1,2, JIA Xiang-xin 1,2, QIN Lu-sheng 1,2, WANG Ying-hui 1,2, LIANG Shu-qi 1,2 · Editorial Office of Chinese Journal of Geotechnical Engineering · 2017

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Autore / responsabile
NIE Qing-ke 1,2, JIA Xiang-xin 1,2, QIN Lu-sheng 1,2, WANG Ying-hui 1,2, LIANG Shu-qi 1,2
Editore
Editorial Office of Chinese Journal of Geotechnical Engineering
Anno
2017
ISSN
1000-4548
ISSN
1000-4548
Lingua
Inglés
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Currently the application of 50 drill pipe is more in the standard penetration test (SPT) in the geotechnical engineering investigation, which is different from the code that 42 drill pipe is specified. Based on the project in Xiaoyi of Shanxi province, the results of SPT with drill pipes of 50 and 42 are compared, and the effects of diameters on the number N of SPT are statistically analyzed. The results show that the diameter of drill pipes has a certain influence on the number N of SPT, and the effects are different due to different test depths and strata. When the test depth is from 0.0 to 30.0 m, the ratio of the average values of number N of 42 to 50 drill pipe is between 0.85~0.87, and the ratio is 1.09 when the test depth is from 30.0 to 40.0 m. In silty clay and silt, the number N of SPT measured by 50 drill pipe is greater than that by 42 drill pipe, while in dense sand, the number N of the two kinds of drill pipe is close.

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APA 7

NIE Qing-ke 1, 2. J. X. X. 1. Q. L. S. 1. W. Y. H. 1. L. S. Q. 1. (2017). Field tests on the effects of diameter of drill pipe on number N of SPT. https://doi.org/10.11779/CJGE2017S1011

MLA

NIE Qing-ke 1, 2, JIA Xiang-xin 1,2, QIN Lu-sheng 1,2, WANG Ying-hui 1,2, LIANG Shu-qi 1,2. "Field tests on the effects of diameter of drill pipe on number N of SPT." 2017. https://doi.org/10.11779/CJGE2017S1011.

Chicago

NIE Qing-ke 1, 2, JIA Xiang-xin 1,2, QIN Lu-sheng 1,2, WANG Ying-hui 1,2, LIANG Shu-qi 1,2. 2017. "Field tests on the effects of diameter of drill pipe on number N of SPT.". https://doi.org/10.11779/CJGE2017S1011.

Harvard

NIE Qing-ke 1, 2. J. X. X. 1. Q. L. S. 1. W. Y. H. 1. L. S. Q. 1. 2017, Field tests on the effects of diameter of drill pipe on number N of SPT, Editorial Office of Chinese Journal of Geotechnical Engineering, available at: https://doi.org/10.11779/CJGE2017S1011 [Accessed 8 Aug. 2026].

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Titolo
Field tests on the effects of diameter of drill pipe on number N of SPT
Autore / collaboratori
NIE Qing-ke 1,2, JIA Xiang-xin 1,2, QIN Lu-sheng 1,2, WANG Ying-hui 1,2, LIANG Shu-qi 1,2
Editore
Editorial Office of Chinese Journal of Geotechnical Engineering
Anno di pubblicazione
2017
ISSN
1000-4548
ISSN
1000-4548
Lingua
Inglés

Soggetti

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geotechnical investigation; standard penetration test; drill pipe; diameter
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