ABSTRACT

It is conceivable that when the ground at the back of the L-type retaining wall is improved using cement, the values for the earth pressure acting on the face of the retaining wall will decline because the retaining wall and the improved part of the retaining wall will be integrated into a whole. In such case, it is presumed that the ground improvement shape will greatly affect the structural performance of the retaining wall due to the earth pressure acting on the ground improvement boundary surface. This paper is designed to verify the effect of ground improvement at the back of the retaining wall on overburden loading by using test specimens which make it possible to measure the earth pressure acting on the ground improvement boundary surface.

INTRODUCTION

It is fairly reasonable to expect that an additional overburden load will be applied to the existing L-type retaining wall. A good example is the extension to the utmost building-to-land ratio of a house built on a spacious site. In such case, it is necessary to verify the safety of the existing retaining wall affected by overburden loading. It is conceivable that, in such case, if the ground at the back of the retaining wall is improved using cement, the retaining wall and the ground at the back of the retaining wall will be integrated into a whole, almost no earth pressure acting on the face of the retaining wall as a result. It is possible, therefore, to apply overburden load to the existing retaining wall after verifying the safety of the supporting ground.

For the above-stated reasons, in this study, various experiments are conducted using the ground improvement shape at the back of the L-type retaining wall and the loading position as parameters with the aim of examining the relationship between the ground improvement shape and the ground improvement effect.

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