Numerical simulation of ground flow caused by seismic liquefaction |
| |
| Authors: | S Tamate I Towhata |
| |
| Institution: | a Construction Safety Research Division, National Institute of Industrial Safety, Ministry of Labour, 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan;b Faculty of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyou-ku, Tokyo 113-8685, Japan |
| |
| Abstract: | Flow failure of sandy subsoil induced by seismic liquefaction is known to cause significant damage to structures. It is induced not only by the dynamic forces exerted by seismic acceleration but also by the static gravity force in consequence of the topography of the ground. The ground flow may sometimes continue after the end of the seismic loading and finally the ground is significantly deformed to cause a failure.This paper numerically predicts the magnitude of flow that could occur when soil liquefaction continues for a sufficiently long period. It is considered that liquefied soil behaves like a viscous liquid, and hence, ground flow is governed by the principle of minimum potential energy. In the calculation, liquefied sand is assumed to be a viscous liquid that deforms in undrained conditions with its volume remaining constant. To consider the non-linearity due to large displacement, the updated Lagrangian method is used to solve the equation of motion. The Newmark β method is employed to calculate the time history of the ground motion. Finally, a simulation using this calculation method shows that the proposed method gives reasonable results for the conditions indicated. |
| |
| Keywords: | Deformation Earthquake Liquefaction Ground flow Finite element analysis Time-history analysis Large displacement |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
