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Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea

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  • Ruchun Wei

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266232, China
    Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
    The Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Shandong University, Qingdao 266232, China)

  • Lele Liu

    (Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China)

  • Chao Jia

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266232, China
    The Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Shandong University, Qingdao 266232, China)

  • Hualin Zhao

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266232, China
    The Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Shandong University, Qingdao 266232, China)

  • Xiao Dong

    (Institute of Marine Science and Technology, Shandong University, Qingdao 266232, China
    The Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Shandong University, Qingdao 266232, China)

  • Qingtao Bu

    (Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China)

  • Changling Liu

    (Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China)

  • Nengyou Wu

    (Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China)

Abstract

Suction piles are used to ensure wellhead stability during natural gas hydrate production in the Shenhu area of the South China Sea (SCS). Undrained shear properties of clayey-silty sediments play a critical role in the stability analysis of suction piles. However, it has not been fully studied. This study conducts a series of undrained triaxial shear tests on shallow clayey-silty sediments in the Shenhu area of SCS, and stress–strain curves under different overconsolidation ratio (OCR) conditions are obtained. OCR effects on undrained shear properties of clayey-silty sediments are discussed, and a model to predict the pore pressure coefficient at failure is proposed. Results show that the isotropic compression index is 0.175, and the isotropic swelling index is 0.029. The undrained shear strength is proportional to the effective confining pressure, and the proportionality coefficient is 0.42 for normally consolidated specimens, while the undrained shear strength of OC specimens nonlinearly increases with OCRs increasing. The proposed model aptly predicts the pore pressure coefficient at the failure of clayey-silty sediments of SCS with different OCRs.

Suggested Citation

  • Ruchun Wei & Lele Liu & Chao Jia & Hualin Zhao & Xiao Dong & Qingtao Bu & Changling Liu & Nengyou Wu, 2023. "Undrained Shear Properties of Shallow Clayey-Silty Sediments in the Shenhu Area of South China Sea," Sustainability, MDPI, vol. 15(2), pages 1-15, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1175-:d:1028910
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    References listed on IDEAS

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    1. E. Dendy Sloan, 2003. "Fundamental principles and applications of natural gas hydrates," Nature, Nature, vol. 426(6964), pages 353-359, November.
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    Cited by:

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    2. Zhijun Kong & Yanhui Guo & Shilin Mao & Wei Zhang, 2023. "Experimental Study on Shear Strength Parameters of Round Gravel Soils in Plateau Alluvial-Lacustrine Deposits and Its Application," Sustainability, MDPI, vol. 15(5), pages 1-23, February.

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