Published

2021-07-19

Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China

Caracterización de la correlación entre los valores N del Ensayo de Penetración Estándar y el módulo cortante a pequeñas deformaciones Gmax en sedimentos de Jiangsu, China

DOI:

https://doi.org/10.15446/esrj.v25n2.62287

Keywords:

Small strain shears modulus, SPT, SCPTU, Regression relation (en)
modulo cortante a pequeñas deformaciones; Ensayo de Penetración Estándar; Ensayo de Penetración de Cono Sísmico; relación de regresión; (es)

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Authors

  • Ya Chu Southeast UniversityMissouri University of science and technology
  • Songyu Liu Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu, China 210096
  • Guojun Cai Institute of Geotechnical Engineering, Southeast University, Nanjing, Jiangsu, China 210096
Small strain shear modulus plays a fundamental role in the evaluation of site response parameters. Only few authors used measured density and shear wave velocity (Vs) to estimate small strain shear modulus. In this study, an attempt has been made to develop the regression relationship between standard penetration test (SPT) N values and the small strain shear modulus (Gmax). For this purpose, field investigations SPT and seismic piezocone penetration test (SCPTU) data from locations in Su-Xin Expressway of China, have been used, which were also used for ground improvement project. The in situ density of soil layer was estimated using undisturbed soil samples from the boreholes. The Vs profiles with depth were obtained for the locations close to the boreholes. The values for small strain shear modulus have been calculated by measured Vs and in situ soil density. About 50 pairs of SPT-N and Gmax values were used for regression analysis. The differences between measured and corrected values which were used in fitted regression relations were analyzed. Most of the existing correlations were developed based on the studies carried out in Japan and in India, where N values are measured with hammer energy of 78%, which may not be directly applicable for other regions because of the variation in SPT hammer energy which in China is about 55%. A new correlation has been generated using the measured values in silts of China. From this study, it is found that uncorrected values of N and modulus gives the best fit regression relations when compared to corrected N and corrected modulus values. With most equation was used for sand and clay, the regression relations between corrected values of N and modulus gives the equation of silts in China.

El modulo cortante a pequeñas deformaciones juega un rol fundamental en la evaluación de parámetros de respuesta en sitio. El Ensayo de Penetración Estándar (SPT) y el Ensayo de Penetración de Cono Sísmico (SCPTU), los cuales pueden rápidamente obtener la densidad y la velocidad de la onda de corte (Vs), se han utilizado poco en la estimación del modulo cortante a pequeñas deformaciones. En este estudio se realiza un acercamiento para desarrollar la relación de regresión entre los valores N del Ensayo de Penetración Estándar y el módulo cortante a pequeñas deformaciones (Gmax). Con este objetivo se utilizó la información de las investigaciones de campo del SPT y del SCPTU en las ubicaciones de la autovía Su-Xin de China, que también se usaron en el proyecto de mejoramiento del terreno. La densidad in-situ de la capa de suelo se estimó a través de muestras inalteradas tomadas por perforación. Los perfiles Vs con profundidad se obtuvieron de ubicaciones cercanas a las perforaciones. Los valores del módulo cortante a pequeñas deformaciones fueron calculados por la medición de los valores Vs y la densidad del suelo in-situ. Cerca de 50 acoples de valores SPT-N y Gmax se utilizaron en el análisis de regresión. Además, se analizaron las diferencias entre los valores medidos y los valores corregidos que fueron usados en las relaciones de regresión ajustadas. Gran parte de las correlaciones se desarrollaron con base en estudios realizados en Japón e India, donde los valores N se midieron con martillo eléctrico de 78 %, que no sería directamente aplicable para otras regiones debido a que la variación en el Ensayo de Penetración Estándar del martillo eléctrico en China es del 55 %. Una nueva correlación se ha generado a través de valores medidos en sedimentos en China. En este estudio se encontró que los valores N no corregidos y del módulo proporcionan las relaciones de regresión más adaptables cuando se comparan con los valores N corregidos y del módulo. Con las ecuaciones usadas para la arena y la arcilla, las relaciones de regresión entre los valores N corregidos y del módulo proporcionan la ecuación de sedimentos en China.

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How to Cite

APA

Chu, Y., Liu, S. and Cai, G. (2021). Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China. Earth Sciences Research Journal, 25(2), 225–235. https://doi.org/10.15446/esrj.v25n2.62287

ACM

[1]
Chu, Y., Liu, S. and Cai, G. 2021. Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China. Earth Sciences Research Journal. 25, 2 (Jul. 2021), 225–235. DOI:https://doi.org/10.15446/esrj.v25n2.62287.

ACS

(1)
Chu, Y.; Liu, S.; Cai, G. Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China. Earth sci. res. j. 2021, 25, 225-235.

ABNT

CHU, Y.; LIU, S.; CAI, G. Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China. Earth Sciences Research Journal, [S. l.], v. 25, n. 2, p. 225–235, 2021. DOI: 10.15446/esrj.v25n2.62287. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/62287. Acesso em: 28 mar. 2025.

Chicago

Chu, Ya, Songyu Liu, and Guojun Cai. 2021. “Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China”. Earth Sciences Research Journal 25 (2):225-35. https://doi.org/10.15446/esrj.v25n2.62287.

Harvard

Chu, Y., Liu, S. and Cai, G. (2021) “Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China”, Earth Sciences Research Journal, 25(2), pp. 225–235. doi: 10.15446/esrj.v25n2.62287.

IEEE

[1]
Y. Chu, S. Liu, and G. Cai, “Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China”, Earth sci. res. j., vol. 25, no. 2, pp. 225–235, Jul. 2021.

MLA

Chu, Y., S. Liu, and G. Cai. “Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China”. Earth Sciences Research Journal, vol. 25, no. 2, July 2021, pp. 225-3, doi:10.15446/esrj.v25n2.62287.

Turabian

Chu, Ya, Songyu Liu, and Guojun Cai. “Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China”. Earth Sciences Research Journal 25, no. 2 (July 19, 2021): 225–235. Accessed March 28, 2025. https://revistas.unal.edu.co/index.php/esrj/article/view/62287.

Vancouver

1.
Chu Y, Liu S, Cai G. Characterization on the correlation between SPT-N and small strain shear modulus Gmax of Jiangsu silts of China. Earth sci. res. j. [Internet]. 2021 Jul. 19 [cited 2025 Mar. 28];25(2):225-3. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/62287

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