Sinking of irregular shape blocks into marine seabed under wave-induced liquefaction |
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| Institution: | 1. Mechanical and Civil Engineering Department, California Institute of Technology, Pasadena, CA, USA;2. Department of Civil Engineering, Sharif University of Technology, Tehran, Iran;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China;2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, China;3. Griffith School of Engineering, Cities Research Centre, Griffith University Gold Coast Campus, Queensland, Australia;4. School of Engineering, University of Bradford, Bradford BD7 1DP, UK;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;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China;2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, Jiangsu 210098, China;3. Key Laboratory of Engineering Sediment of Ministry of Transport, Tianjin Research Institute for Water Transport Engineering, M.O.T, Tianjin 300456, China;4. Faculty of Civil Engineering, University of Transport and Communications, Hanoi, Vietnam |
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| Abstract: | The sinking of initially buried irregular blocks into the seabed under wave-induced liquefaction was investigated by experimental methods. Pore-water pressure in the soil, water surface elevation time series and block displacements were measured. Results indicated that initiation of sinking coincides with the instant at which the accumulated pore-water pressure at the bottom level of the block reaches the initial mean normal effective stress. The drag forces and drag coefficients on steadily sinking irregular shaped blocks, as well as spherical and cubical ones, were calculated from the obtained data and compared with the available data in the literature. The results show that the shape of sinking block is of minor importance as far as the kinematics and dynamics of the sinking block is concerned. The conditions at which the sinking terminates are discussed in the light of experiments. Using the approach presented here, the ultimate sinking depths are calculated for the tested cases and compared with the experimental results. The calculated and measured values showed a reasonable agreement when compared. Finally a summary and remarks are presented to calculate the ultimate sinking depth of irregular shaped blocks for practical applications. |
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