SETTLEMENT OF SURROUNDING GROUNDS DUE TO EXISTENCE OF PILE PULLING-OUT HOLES

Abstract

The demolition of social infrastructures including the civil structures have been increasing
because of aging them constructed during in a period of high economic growth and decrease in their utilization
with a population decrease, in recent years. As a result, removal works of existing pile in the ground have been
increasing. Pulling-out method is adopted for removal of existing a pile foundation in the present circumstances.
However, after pulling-out a pipe foundation, decline of mechanical characteristic of surrounding ground is
concerned by forming pulling-out holes. There are no regulations yet for filler injected into a pulling hole, and
the influence of the strength of the filler on surrounding ground is not considered. This study considers the
influence by which a pulling-out hole of a pipe foundation gives it to static characteristics of surrounding
ground by using 3D elastic-plastic finite element analysis. The special qualities required for fillers injected into
a pulling-out hole are also clarified in this study.