Penetration depth prediction of spudcan in sand based on CPTU data

LI Sa; WANG Yao-cun; WU Qiu-yun; JIANG Hua; ZHOU Yang-rui

doi:10.11779/CJGE201402005

Volume 36 Issue 2

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Chinese Journal of Geotechnical Engineering > 2014 > 36(2): 301-306. > DOI: 10.11779/CJGE201402005

LI Sa, WANG Yao-cun, WU Qiu-yun, JIANG Hua, ZHOU Yang-rui. Penetration depth prediction of spudcan in sand based on CPTU data[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(2): 301-306. DOI: 10.11779/CJGE201402005

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Penetration depth prediction of spudcan in sand based on CPTU data

1. Geotechnical Institute, School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. Geophysical Division, China Oilfield Services Limited, Tianjin 300451, China

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Received Date: April 27, 2013
Published Date: February 20, 2014

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Abstract

With the development of offshore engineering, jack-ups have moved into deeper and harsher environment, hence increasing need to understand the behaviors of jack-ups and to develop more reliable analysis techniques. In order to improve the prediction accuracy, based on the characteristics of the spudcan penetration in sand, the spherical cavity expansion theory is used to analyze the penetration resistance of spudcan under no backflow condition. At the same time, this method is also used to present cone tip resistance of CPTU. According to the analytical solutions, the relationship between spudcan penetration resistance and cone resistance of CPTU is established. In order to verify the reliability of the relationship, the spudcan penetration depths of six jack-ups in South China Sea are predicted by using the traditional method and the proposed method respectively. The predicted results are compared with the measured data. It is shown that the results by the proposed method are in better agreement with the measured data than those by the traditional method commonly used today.
- spudcan,
- CPTU,
- spherical cavity expansion,
- penetration depth prediction

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Penetration depth prediction of spudcan in sand based on CPTU data

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