FOUNDATION STRUCTURE AND ITS CONSTRUCTION FOR BUILDING ON SOFT GROUND

PURPOSE:To prevent the liquefaction of soft ground by providing an improved ground in the surface layer of the inside of a continuous underground wall constructed to at least a depth deeper than the layer to be liquefied in the surrounding area of a building. CONSTITUTION:In the ground G consisting of a layer Ga to be liquefied, a layer Gb not to be liquefied, and a supporting layer Gc for a building, an underground continuous wall 1 is constructed to a depth deeper than the layer Ga at least in the surrounding area of a building 4, the ground is improved by arranging layers 2 surrounded by the walls 1 in mesh form 2a, for example, and the building 4 is supported by a foundation pile 3 reaching the layer Gc. Thereby, the deformation of sandy layer inside the wall 1 can be restricted and the shearing strength of the layer Ga can also be increased.