Abstract
In recent years, removal work of existing piles has been increasing, and many pulling-out methods for existing piles are being applied. As for the present situation, there is concern that the physical characteristics of the ground will deteriorate due to the holes that remain after pulling out the existing piles (pullout holes). In addition, the filler to be injected into these pullout holes has not yet been specified and the influence of the physical properties of the filler on the surrounding ground has not been elucidated. In this study, therefore, the authors evaluated the influence of pullout holes on the static physical characteristics of the ground by elasto-plastic analysis using a three-dimensional static FEM. As a result, the settlement of the ground surface was seen to increase as the number of pullout holes increased, but it was obvious that the region of the surrounding ground influenced by the settlement does not depend on the number of pullout holes. The authors also clarified that the strength characteristics of the filler injected into the pullout holes do not cause local settlement of the surrounding ground and that it is important to perform reliable filling to the bottom of the pullout holes.
Highlights
In Japan, during the period of high economic growth from 1955 to 1965, buildings and public structures, such as bridges and tunnels, were constructed in large quantities
It is thought that the aging of these buildings and structures will progress intensively in the near future
According to an announcement by the Ministry of Internal Affairs and Communications, it is said that 12,251 public facilities are being considered for demolition by municipalities nationwide [16]
Summary
In Japan, during the period of high economic growth from 1955 to 1965, buildings and public structures, such as bridges and tunnels, were constructed in large quantities. Pulling‐out analysis of sheet piles The FEM is used as a method to analyze the deformation behavior of the surrounding ground as well as the deformation and stress of an existing structure during the excavation of retaining sheet piles. In order to consider these issues, in this research, the authors decided to study the influence of pullout holes on the surrounding ground by a three-dimensional elasto-plastic analysis. The region up to ± 15 m in the X direction and the region of − 14 m to 16 m in the Z direction were affected by the settlement on the ground surface; and a bulge was generated outside the affected region This was caused by downward force due to the self-weight of the ground acting by the initial stress analysis, while upward force was exerted because downward force was released by the formation of pullout holes.
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