ANALYTICAL STUDY ON REINFORCEMENT OF EXISTING FOUNDATIONS BY USING PILES AND SOILBAGS

Abstract

 The authors have proposed a foundation composed of piles and soilbags. The authors have experimentally and analytically verified the superiority of the proposed structure over conventional foundations such as pile foundations for newly constructed structures. In this study, the authors proposed a method of reinforcing the foundation of existing structures by using additional piles, soilbags, and additional footings, and conducted test calculations together with the unreinforced structure and the reinforced structure with normal additional pile method. The results showed that the proposed method could suppress the rotational angle of the footing without increasing the inertia force excessively in the condition of foundation width of approximately 8 m after reinforcement, pier height of 10-15 m, and superstructure load of 6730 kN. The proposed method can be used as a reinforcement method for foundations such as existing wooden pile foundations and spread foundations, whose inertial force during large earthquakes is small before the reinforcement.