A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
LIQUEFACTION ESTIMATION METHOD OF PILE FOUNDATION IMPROVED GROUND, AND PILE FOUNDATION GROUND IMPROVEMENT METHOD
To efficiently estimate liquefaction of an improved ground considering a pile foundation.SOLUTION: A liquefaction estimation method of a pile foundation improved ground 1 includes: creating a first calculation chart which is obtained from equivalent shearing speed of a pile-like ground improvement body improved in a pile-like improvement shape; creating a second calculation chart which is obtained from equivalent shearing speed of a lattice-like ground improvement body 3; converting material values of the pile-like ground improvement body to material values of an existing pile 2 using the first calculation chart to obtain a relation between a shearing stress τ and a strain γ having rigidity of the existing pile 2 and an original ground G; obtaining a relation between the shearing stress τ and the strain γ of the lattice-like ground improvement body 3 using the second calculation chart; obtaining a liquefaction safety ratio comprising a shearing stress ratio generated in a ground before and after improvement, based on the relation between the shearing stress τ and the strain γ having rigidity of the existing pile 2 and the original ground G and the relation between the shearing stress τ and the strain γ of the lattice-like ground improvement body 3; and determining presence/absence of liquefaction based on a size of the shearing stress ratio.SELECTED DRAWING: Figure 1
【課題】杭基礎を考慮した改良地盤の液状化を効率よく評価できる。【解決手段】改良形状をパイル状に改良したパイル状地盤改良体の等価せん断速度より得られた第１算定チャートを作成し、格子状地盤改良体３の等価せん断速度より得られた第２算定チャートを作成し、第１算定チャートを使用してパイル状地盤改良体の材料値を既存杭２の材料値に変換し、既存杭２と原地盤Ｇの剛性をもつせん断応力τとひずみγの関係を求め、第２算定チャートを使用して格子状地盤改良体３のせん断応力τとひずみγの関係を求め、既存杭２と原地盤Ｇの剛性をもつせん断応力τとひずみγの関係、及び格子状地盤改良体３のせん断応力τとひずみγの関係に基づいて、改良前後の地盤に生じるせん断応力比からなる液状化安全率を求め、せん断応力比の大きさに基づいて液状化の有無を判定するようにした杭基礎改良地盤１の液状化評価方法を提供する。【選択図】図１
LIQUEFACTION ESTIMATION METHOD OF PILE FOUNDATION IMPROVED GROUND, AND PILE FOUNDATION GROUND IMPROVEMENT METHOD
To efficiently estimate liquefaction of an improved ground considering a pile foundation.SOLUTION: A liquefaction estimation method of a pile foundation improved ground 1 includes: creating a first calculation chart which is obtained from equivalent shearing speed of a pile-like ground improvement body improved in a pile-like improvement shape; creating a second calculation chart which is obtained from equivalent shearing speed of a lattice-like ground improvement body 3; converting material values of the pile-like ground improvement body to material values of an existing pile 2 using the first calculation chart to obtain a relation between a shearing stress τ and a strain γ having rigidity of the existing pile 2 and an original ground G; obtaining a relation between the shearing stress τ and the strain γ of the lattice-like ground improvement body 3 using the second calculation chart; obtaining a liquefaction safety ratio comprising a shearing stress ratio generated in a ground before and after improvement, based on the relation between the shearing stress τ and the strain γ having rigidity of the existing pile 2 and the original ground G and the relation between the shearing stress τ and the strain γ of the lattice-like ground improvement body 3; and determining presence/absence of liquefaction based on a size of the shearing stress ratio.SELECTED DRAWING: Figure 1
【課題】杭基礎を考慮した改良地盤の液状化を効率よく評価できる。【解決手段】改良形状をパイル状に改良したパイル状地盤改良体の等価せん断速度より得られた第１算定チャートを作成し、格子状地盤改良体３の等価せん断速度より得られた第２算定チャートを作成し、第１算定チャートを使用してパイル状地盤改良体の材料値を既存杭２の材料値に変換し、既存杭２と原地盤Ｇの剛性をもつせん断応力τとひずみγの関係を求め、第２算定チャートを使用して格子状地盤改良体３のせん断応力τとひずみγの関係を求め、既存杭２と原地盤Ｇの剛性をもつせん断応力τとひずみγの関係、及び格子状地盤改良体３のせん断応力τとひずみγの関係に基づいて、改良前後の地盤に生じるせん断応力比からなる液状化安全率を求め、せん断応力比の大きさに基づいて液状化の有無を判定するようにした杭基礎改良地盤１の液状化評価方法を提供する。【選択図】図１
LIQUEFACTION ESTIMATION METHOD OF PILE FOUNDATION IMPROVED GROUND, AND PILE FOUNDATION GROUND IMPROVEMENT METHOD
杭基礎改良地盤の液状化評価方法および杭基礎地盤改良工法
KIMURA TAKUMI (author) / NAKAMURA AKITAKE (author) / HARA YUSHIRO (author) / ISHIKAWA AKIRA (author) / HOTTA HIROYUKI (author)
2021-09-13
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
Seismic performance of group pile foundation with ground improvement during liquefaction
| DOAJ | 2021
| European Patent Office | 2023
LIQUEFACTION COUNTERMEASURE FOUNDATION PILE AND LIQUEFACTION COUNTERMEASURE FOUNDATION STRUCTURE
| European Patent Office | 2015
Fabricated ground screw foundation pile construction method
| European Patent Office | 2021