Abstract
Marine clay supporting high-temperature offshore structure susceptible to random movements (such as a buckling high-temperature pipeline) experiences variable shearing rates at an elevated temperature that is higher than the marine environment (typically 4 °C). This practically implies that the undrained shear strength (su) of the marine clay being routinely characterized in situ by penetrometers at a constant rate under an isothermal condition (4 °C) should be carefully corrected, by taking into account the temperature and rate dependency. To date, the combined effects of rate and temperature on the undrained shear behaviour of marine clay are merely investigated experimentally and theoretically. This study presents the development of an anisotropic thermo-elastic–viscoplastic model and a series of temperature- and rate-controlled triaxial tests for validation purpose. Compared to the modified Cam-Clay model, the proposed model only introduces three new parameters to characterize the temperature dependency, rate dependency and the inherent anisotropy of K0-consolidated marine clay. The predictive capability of the model has been validated by the triaxial test results. Based on the new model, an explicit equation is formulated for quantifying the temperature- and rate-dependent su of marine clay. Calculation charts are also developed to quantify su of marine clay with different plasticity indexes under various strain rates and temperatures.
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Acknowledgements
The authors gratefully acknowledge the financial supports from National Key Research and Development Programme (Grant No. 2016YFC0800200), National Natural Science Foundation of China (51939010 and 51779221), Key Research and Development Programme of Zhejiang Province (2018C03031) and Key Science and Technology Plan of PowerChina Huadong Engineering Corporation (KY2018-ZD-01) and Zhejiang Provincial Natural Science Foundation (LQ20E090001 and LHZ20E090001).
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Wang, K., Wang, L. & Hong, Y. Modelling thermo-elastic–viscoplastic behaviour of marine clay. Acta Geotech. 15, 2415–2431 (2020). https://doi.org/10.1007/s11440-020-00917-9
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DOI: https://doi.org/10.1007/s11440-020-00917-9