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Undrained Shear Strength Assessments for Clay of the Offshore Wind Power Projects in Vietnam

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Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering (VSOE2021 2021)

Part of the book series: Lecture Notes in Civil Engineering ((LNCE,volume 208))

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Abstract

As a case study, the CPTU and laboratory tests results Binh Dai offshore wind power projects in Vietnam are analyzed to acquire the accurate strength parameters and interpretative parameters of CPTU. The undrained shear strength su derived from UU test and unconfined compression test (Qu) are overly conservative, while su from direct quick shear tests (DSq) and consolidated undrained shear tests (CU) are more representative in Binh Dai site. The normalised undrained shear strength (su/σv0′)NC for the organic clay and stiff clay in are approximately 0.13 and 0.28 obtained from DSq test, respectively. The results from CU test of both organic clay and stiff clay are identical with a value of 0.36, which is relatively higher than the DSq test. By combining SHANSEP and CPTU data, the undrained shear strength of clayey soil can be obtained using the conservative su/σv0’ value from DSq test, which show a good agreement with the laboratory test results of organic clay at the top, and reappear the in-situ undrained shear strength of the stiff clay from 20 m to 50 m. Finally, the Nkt method is introduced to calibrate the SHANSEP and OCR-to-CPTU interpretation, Nkt of 21 is recommended for Binh Dai offshore area.

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Acknowledgement

The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (Grant No. 52108356 and 52101334), Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ20E090001 and LQ19E090002), and Technology project of POWERCHINA Huadong Engineering Corporation (Grant No. KY2020-KC-01).

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Authors and Affiliations

  1. Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province, POWERCHINA Huadong Engineering Corporation Limited, Hangzhou, 311122, China

    Kuanjun Wang, Mingyuan Wang, Kanmin Shen, Jianhua Lu & Ben He

  2. Zhejiang Huadong Construction Engineering Corporation Limited, Hangzhou, 310014, China

    Kuanjun Wang & Mingyuan Wang

  3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China

    Zhen Guo

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  1. Kuanjun Wang
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  2. Mingyuan Wang
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  3. Kanmin Shen
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  4. Jianhua Lu
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  5. Ben He
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  6. Zhen Guo
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Editors and Affiliations

  1. Norwegian Geotechnical Institute, Oslo, Oslo, Norway

    Dat Vu Khoa Huynh

  2. École des ponts ParisTech, Marne-la-Vallée CEDEX 2, France

    Anh Minh Tang

  3. Subsea7, Suresnes CEDEX, France

    Dinh Hong Doan

  4. University of Western Australia, Perth, WA, Australia

    Phil Watson

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Wang, K., Wang, M., Shen, K., Lu, J., He, B., Guo, Z. (2022). Undrained Shear Strength Assessments for Clay of the Offshore Wind Power Projects in Vietnam. In: Huynh, D.V.K., Tang, A.M., Doan, D.H., Watson, P. (eds) Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering. VSOE2021 2021. Lecture Notes in Civil Engineering, vol 208. Springer, Singapore. https://doi.org/10.1007/978-981-16-7735-9_19

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  • DOI: https://doi.org/10.1007/978-981-16-7735-9_19

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-7734-2

  • Online ISBN: 978-981-16-7735-9

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