Numerical Analysis for Ground Subsidence Caused by Extraction Holes of Removed Piles

Shinya Inazumi, Shuichi Kuwahara, Supakij Nontananandh, Apiniti Jotisankasa, Susit Chaiprakaikeow

Research output: Contribution to journalArticlepeer-review

Abstract

Around the world, and especially in Japan, the tearing down of social infrastructure, including civil engineering structures, has been increasing due to the aging of these constructions, which were built during a period of high economic growth, and a decrease in their utilization caused by a recent drop in the population. The number of existing pile foundations being pulled out has gradually risen to a higher number than that of pile foundations being newly installed. However, after the pulling-out of a pile foundation, the mechanical characteristics of the surrounding ground are of great concern due to the existence of the holes that form when the existing piles are removed (extraction holes). In this study, a three-dimensional elasto-plastic consolidation analysis was performed to examine the effect of the extraction holes of removed piles on the static properties of the surrounding ground. As examples of the results of the analysis, if an extraction hole of a removed pile is left as it is, large ground subsidence will occur near the extraction hole of removed pile, especially at the lower part of the clay layer near the hole. The greater the number of extraction holes of removed piles, the greater the compressive stress acting on the extraction holes after the pile removal. Therefore, the filler should exhibit strength early as the number of extraction holes of removed piles increases.

Original languageEnglish
Article number5481
JournalApplied Sciences (Switzerland)
Volume12
Issue number11
DOIs
Publication statusPublished - 2022 Jun 1

Keywords

  • existing pile foundation
  • extraction hole
  • finite element method
  • pulling-out method

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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