NUMERICAL EVALUATION OF EFFECTS OF LARGE-SPACE LATTICED WALLS AND DRAINS AGAINST LIQUEFACTION OF GROUNDS

Abstract

 The 2011 East Japan earthquake induced widespread liquefaction not only in Tokyo bay area but also in inland area of Kanto region, which damaged numerous residential houses and public buildings. This paper uses three-dimensional dynamic effective stress analyses to evaluate the mechanisms and effects of large-space latticed walls and drains and their combination, which can be installed as measures to mitigate liquefaction of grounds of existed residential houses and buildings. Numerical results show that the shear stress in the walls parallel to the direction of ground shaking is significantly larger that that in the walls perpendicular to the direction of ground shaking.