Effects of cross-anisotropic soil behaviour on the wave-induced residual liquefaction in the vicinity of pipeline buried in elasto-plastic seabed foundations |
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| Institution: | 1. School of Civil Engineering, South West Jiaotong University, Sichuan, 610031, China;2. Key Laboratory of Theory and Technology of High-Speed Railway Structures, Ministry of Education, South West Jiaotong University, Sichuan, 610031, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD 4222, Australia;4. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;1. Consejo Nacional de Ciencia y Tecnología, El Colegio de la Frontera Sur (CONACYT-ECOSUR), Department of Systematics and Aquatic Ecology, Av. del Centenario km 5.5, Chetumal, Quintana Roo, Mexico;2. Leichtweiss-Institute for Hydraulic Engineering and Water Resources, Technische Universität Braunschweig, Beethovenstr. 51a, Braunschweig, Germany;1. The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Centre for Marine Geotechnical Engineering, Shanghai Jiao Tong University, Shanghai 200240 China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia |
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| Abstract: | In this paper, a two-dimensional integrated numerical model is developed to examine the influences of cross-anisotropic soil behaviour on the wave-induced residual liquefaction in the vicinity of a pipeline buried in a porous seabed. In the wave model, the RANS (Reynolds Averaged Navier–Stokes) equation is used to govern the wave motion. In the seabed model, the residual soil response in the vicinity of an embedded pipeline is considered with the 2-D elasto-plastic solution, where the phase-resolved shear stress is used as a source for the build-up of residual pore pressure. Classical Biot?s consolidation equation is used for linking the solid-pore fluid interaction. The validation of the proposed integrated numerical model is conducted by the comparisons with the previous experimental data. Numerical examples show that the pore pressures can accumulate to a large value, thus resulting in a larger area of liquefaction potential in the given anisotropic soil compared to that with isotropic solution. The influences of anisotropic parameters on the wave-induced residual soil response in the vicinity of pipeline are significant. A high rate of pore pressure accumulation and dissipation is observed and the liquefaction potential develops faster as the anisotropic parameters increase. Finally, a simplified approximation based on a detailed parametric investigations is proposed for the evaluation of maximum liquefaction depth (zL) in engineering application. |
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| Keywords: | Pipeline Anisotropic soil Elasto-plastic model Phase-resolved shear stress Residual liquefaction |
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