Settlement of Surrounding Grounds Due to Existence of Pile Pulling-Out Holes

Kuwahara, Shuichi

doi:10.21660/2019.54.8132

Cited by 10 publications

(3 citation statements)

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“…1). A two-dimensional elastic analysis by the FEM was carried out on a ground from which the existing piles had not been pulled out, on a ground from which the existing piles had been pulled out and the pullout holes had been left hollow, and on a ground from which the existing piles had been pulled out and the pullout holes had been filled with a filler [9]. However, an analysis in two dimensions can only account for the displacement on the X-Y plane.…”

Section: Pulling-out Analysis Of Piles In Two Dimensionsmentioning

confidence: 99%

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Influence of the condition of pullout holes on the surrounding ground

et al. 2020

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In recent years, removal work of existing piles has been increasing, and many pullingout 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 threedimensional 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.

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Section: Pulling-out Analysis Of Piles In Two Dimensionsmentioning

confidence: 99%

“…In this method, the casing hugs and pulls out the entire existing piles. With this method, therefore, it is possible to more reliably pull out broken existing piles and existing piles whose joint parts are not joined than with other pullingout methods [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the condition of pullout holes on the surrounding ground

et al. 2020

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“…Therefore, problems arise when parts of existing piles are left in the ground after the pulling-out process. The pile tip chucking method [6,7] is a pulling method that was developed to solve these problems. In this method, the entire length of an existing pile is wrapped and pulled up and out of the ground by the casing.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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