Behavior of braced excavated earth retaining wall using strut-shaped ground improvement in soft clay

Abstract

In recent years, there has been an increasing amount of excavation work that advanced onto adjacent structures. In order to minimize the effect on adjacent structures, it is important to suppress the displacement of the earth retaining wall. In soft clay ground, ground improvement is often adopted to reduce the displacement of the earth retaining wall. In addition, it is necessary to develop a method that would predict the displacement of the earth retaining wall. In this paper, the measured results of excavation work up to 9.7 m in soft ground are presented. Strut-shaped ground improvement had to be applied since the stiff ground depth was more profound than the excavation depth. It was confirmed that strut-shaped ground improvement reduced the deformation of the earth retaining wall caused by the excavation. Moreover, the beam-spring analytical method was found to be effective for evaluating the behavior of the earth retaining wall by means of ground improvement.