Analysis of Wave-Induced Liquefaction in Seabed Deposits of Silt

• Published in: China ocean engineering Vol. 25; no. 1; pp. 31 - 44
• Main Author: 高玉峰 沈扬 张健 黎冰
• Format: Journal Article
• Language: English
• Published: Heidelberg Chinese Ocean Engineering Society 01.03.2011; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China; Geotechnical Research Institute of Hohai University,Hohai university,Nanjing 210098,China%College of Civil Engineering,Southeast University,Nanjing 210096,China
• Subjects: Coastal Sciences; Data points; Density; Engineering; Fluid- and Aerodynamics; Liquefaction; Marine; Marine & Freshwater Sciences; Mathematical analysis; Numerical and Computational Physics; Oceanography; Offshore Engineering; Sea beds; Silts; Simulation; Stress ratio; Stresses; 小振幅波理论; 循环应力比; 曲线拟合方法; 海底沉积; 海底淤泥; 液化分析; 相对密度; 诱导; triaxial-torsional coupling shear; wave loading; silt; critical cyclic stress ratio; seabed liquefaction; triaxial-torsional coupling shear,critical cyclic stress ratio; wave loading,seabed liquefaction
• ISSN: 0890-5487
• DOI: 10.1007/s13344-011-0003-z

The dynamic stress introduced in half elastic space by wave loading is characterized by the equation between the magnitude of half cyclic axial stress and cyclic torsion shear stress and the principal stress, whose direction rotates continuously and compression stress on seabed can be calculated by the use of small amplitude wave theory. With relationship curves of saturated silt of liquefaction cycles and cyclic stress ratios obtained by cyclic triaxial-torsional coupling shear tests and curve fitting method to different data points of relative density, it is suggested that the cyclic stress ratio corresponding to constant liquefaction impedance be taken as the critical cyclic stress ratio which implies liquefaction. There exists a linear relationship between critical cyclic stress ratio and relative density under different relative densities. Empirical formula for critical cyclic stress ratios of seabed liquefaction induced by wave loading under different relative densities is established. The possibility of seabed silt liquefaction and its influence factors are analyzed based on the small-amplitude wave theory and the data acquired in laboratory tests.