| This paper describes a practical foundation design method in which the ground is improved around the heads of pile foundations in soft ground or sandy ground subject to liquefaction. The shear strength increased due to ground improvement is reflected in the horizontal resistance of piles. The horizontal subgrade reaction of piles is determined by converting the shear strength S of improved ground to the modulus of deformation E. In this study、 the increased earthquake resistance produced from ground improvements around pile heads was confirmed through a series of centrifuge shaking tests. The horizontal resistance of piles equivalent to the design value was also confirmed through an in-situ horizontal loading test of piles installed in the improved ground. |
