Horizontal Loading Tests on Model Foundations Retrofitted by Micropiles Masahiro NISHITANI Jiro FUKUI Takeshi UMEBARA IAI, PWRI Structures Research Group.

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Presentation transcript:

Horizontal Loading Tests on Model Foundations Retrofitted by Micropiles Masahiro NISHITANI Jiro FUKUI Takeshi UMEBARA IAI, PWRI Structures Research Group Foundation Engineering Team

Retrofitting of Existing Foundation by Micropiles Limited Headroom Widening of Footing Existing Pile Micropile Bearing Layer

Presentation Outline Outline of horizontal loading tests on group piles Results of horizontal loading tests Results of simulation analyses for the loading tests Summaries

Presentation Outline Outline of horizontal loading tests on group piles Results of horizontal loading tests Results of simulation analyses for the loading tests Summaries

To Clarify the Effects of Group Piles…. → Horizontal Loading Tests on Model Foundations Plane of Existing Foundation with Micropiles Micropile Existing Pile Existing Footing

Cases of Horizontal Loading Tests

Case 1Case 2

Case 3

Cases of Horizontal Loading Tests

Models of Case 4 to Case 7 Existing Pile Micropile Loading Direction Front Rear

Case 4Case 5

Case 6 Case 7

Specifications of Model Piles

Loading Test for Case 3 Footing Steel Bar Jack

Presentation Outline Outline of horizontal loading tests on group piles Results of horizontal loading tests Results of simulation analyses for the loading tests Summaries

Curve of Load and Displacement

Bending Moment on Existing Piles in Case 3 and Case 4

Bending Moment on Existing Piles in Case 4 and Case 6

Bending Moment on Micropiles in Case 4 and Case 6

Shearing Force on Existing Piles in Case 3 and Case 4

Shearing Force on Existing Piles in Case 4 and Case 6

Axial Force on Existing Piles in Case 3, Case 4 and Case 6

Axial Force on Existing Piles in Case 4 and Case 6

Curve of Horizontal Ground Reaction and Displacement

Presentation Outline Outline of horizontal loading tests on group piles Results of horizontal loading tests Results of simulation analyses for the loading tests Summaries

To Study the Design Method of Group Piles with Different Diameter Piles…. → Simulation Analyses for Loading Tests by Ductility Design Method Non-Linear Model ・ Ground Properties ・ Flexural Rigidity of Piles

Model of Transverse Resistance of Pile Upper Limit of Ground Reaction Displacement Ground Reaction ０Ｐ HU Ｔ an －１ｋ HE (m) (N/m 2 )

k HE = a ｋ b ｋ k H p HU = a ｐ b ｐ p U a ｋ, a ｐ : Correction Factors of a Single Pile b ｋ, b ｐ : Correction Factors of Group Piles To consider the group effects… a ｋ b ｋ = 1 a ｐ (Cray Ground) = 1.0 a ｐ b ｐ (Sandy Ground) = S/D ( ≦ 3) To consider the group effects of trailing piles… Transverse Resistance Characteristics of Pile

Loading Direction Trailing Piles Front Rear Front Pile p HU ½ : 1

1) Study new correction factors for a single pile, fitting with Case 1 test results 2) Study new correction factors for group piles, fitting with Case 3 test results 3) Analyze Case 4 to Case 6, using new correction factors Simulation Procedure

New Correction Factors on Analyses

Model of Flexural Rigidity of Steel Pile Curvature Bending Moment ０ Mp My Y Y: Yield State (Nm) (1/m) φy Fully Plastic Moment

Curve of Load and Displacement

Bending Moment on Existing Piles in Case 3 and Case 4 Case 3 Case 4

Bending Moment on Micropiles in Case 4

Curve of Horizontal Ground Reaction and Displacement Case 3

Curve of Horizontal Ground Reaction and Displacement Case 4

Summaries Results of horizontal loading tests → Existing foundations with micropiles have a large retrofitting effects. → Spacing has little effect on retrofitting. → Retrofitting effects are counted by installing micropiles incliningly. Results of simulation analyses → It is possible to use the ductility design method to perform retrofitting design.