Abstract
The aim of this study is to reveal a useful method to increase lateral resistance of existing coupled pile. The authors conducted three kinds of lateral loading tests of coupled pile; centrifuge model test, large-scale model test and X-ray CT scanning model test. This paper describes a method to stabilize ground surrounding coupled pile using cement treating technique. The paper also describes experimental results of the model tests to evaluate effects of several conditions in terms of geometry, depth and strength of cement-treated soil on the lateral resistance of coupled pile. The paper introduces the most promising method to stabilize the ground intermediating between the two piles of coupled pile with its mechanism of increasing the lateral resistance based on the experimental results.
