Seabed Liquefaction around Pipeline with Backfilling Trench Subjected to Strong Earthquake Motions

Qiuzhe Wang, Jiang Bian (), Wenting Huang, Qingrui Lu, Kai Zhao and Zhaoyan Li
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Qiuzhe Wang: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
Jiang Bian: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
Wenting Huang: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
Qingrui Lu: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
Kai Zhao: Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
Zhaoyan Li: Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Sustainability, 2022, vol. 14, issue 19, 1-14

Abstract: As an indispensable part of the lifeline for the offshore gas and oil industry, submarine pipelines under long-term marine environmental loadings have historically been susceptible to earthquakes. This study investigates the impact of trench backfilling on the residual liquefaction around a pipeline and the induced uplift of a pipeline under the combined action of an earthquake, ocean wave and current loading. A fully coupled nonlinear effective stress analysis method, which can consider the nonlinear hysteresis and the large deformation after liquefaction of the seabed soil, is adopted to describe the interaction between the seabed soil and the submarine pipeline. Taking a typical borehole in the Bohai strait as the site condition, the nonlinear seismic response analysis of the submarine pipeline under the combined action of seismic loading and ocean wave and current is carried out. The numerical results show that trench backfilling has a significant impact on the seismic response of the pipeline. The existence of trench backfilling reduces the accumulation of the residual excess pore water pressure, so that the seabed liquefaction around the pipeline is mitigated and the uplift of the pipeline is also decreased.

Keywords: submarine pipeline; earthquake; seabed liquefaction; uplift; ocean environmental loading (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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