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Experimental Study of Pile Foundations under Liquefaction-Induced Lateral Spreading

This project involves a micromechanical computational study of pile foundations' behavior when subjected to liquefaction-induced lateral spreading. Tasks include 1g tests, equipment setup, non-destructive shaking, hydraulic filling trials, and density control tests. The study aims to determine the effects of pumping rate, water depth, and discharge nozzle angle on density control during hydraulic filling trials. The conclusion suggests that low water depth results in high relative density (Dr) and variability can be managed using the bucket density method. Outdoor trials are planned for further validation. The project also includes sand construction, instrumentation, and decision-making on pile design aspects.

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Experimental Study of Pile Foundations under Liquefaction-Induced Lateral Spreading

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  1. Experimental and Micromechanical Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading - Task 1 (1g Tests) – Part AS. Thevanayagam, UBResearch Progress MeetingJune 27, 2006, 2-4 pm; UB-VTCPI: R. Dobry, co-PI’s: A. Elgamal, S. Thevanayagam, T. Abdoun, M. ZeghalUB-NEES Lab: A. Reinhorn, M. Pitman, J. Hanley, T. AlbrechcinskiTulane: Usama El ShamyStudents: UB and RPI Students

  2. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • UB Progress (ST) • Equipment Setup (NE, MP) • Sand Construction & Density Control (NE) • Updated Instrumentation & Coordination (NE, ST, TA) • Non-Destructive Shaking (MP, MZ, AE) • Sloping Ground – Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

  3. Base Floor Plate Assembly - Leveling

  4. Dynamic Actuators & Reaction Beam

  5. Shaking Base & Laminar Box (add Picture)

  6. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • UB Progress (ST) • Equipment Setup (NE, MP) • Sand Construction & Density Control (NE) • Updated Instrumentation & Coordination (NE, ST, TA) • Non-Destructive Shaking (MP, MZ, AE) • Sloping Ground – Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

  7. Hydraulic Filling Trials & Density Controls Slurry Pump (5 HP, 3f, 208V, 14.5 A) Sand Slurry Water Ottawa F-55 Sand Water Container-B Circulating Water Pump Container-A

  8. Sand Construction– Outdoor Hydraulic Filling Trials • Simulate Pumping into Laminar box • Control Pumping Rates • Control Discharge Water Depth & Nozzle • Density Tests • Pipe full length (250ft) • Raised to the height of Laminar box

  9. Hydraulic Filling Trail – June 15, 06 • Water depth= 2 – 4 ft, • Discharge Pipe horizontally moving • Nozzle swinging

  10. Hydraulic Filling Trial – June 21, 06 • Water depth= 1 – 2 ft • Horizontally moving • Vertical nozzle

  11. Density Control Tests Bucket Density ( 6 to 9 Buckets for every 3 ft lift) Cone Density

  12. Density Data Better Control Possible in the Lab.

  13. Hydraulic Fill – Field Data(Mitchell et al.)

  14. Conclusion • Hydraulic pumping into Laminar box feasible • Density depends on pumping rate, water depth, discharge nozzle angle. • Low Dr (15%) at large water depth • High Dr (80%) at low water depth • Variability can be controlled • Bucket Density method works well & easier to implement • Further outdoor trials planned (July 1st/2nd week) • Laminar Box Filling Trials – Planned week 4/July

  15. LAB Reaction Wall Diffuser Slurry Pump (5 HP, 3f, 208V, 14.5 A) Laminar Box (LB) 3”/ 350 ft Hose Water Sand Slurry Ottawa F-55 Sand (150 T) Water Strong Floor Circulating Water Pump Sand Container Sand Preparation (Test LG-1) – July week 3/4 Placement rate / Density – To be worked out ~ 30% - 50% Feasible Sand Hydraulic Placement - Schematic Diagram

  16. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • Non-Destructive Shaking (MP, MZ, AE) • Sand Construction & Density Control (ST) • Updated Instrumentation & Coordination (ST, TA) – FYI Only • Sloping Ground – Simulations & Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

  17. Instrumentation Table: Tests LG-1 & SG-1

  18. Sensor Locations: Tests LG-1 & SG-1

  19. Sensor Locations: Tests LG-1 & SG-1(E-W)

  20. Sensor Locations: Tests LG-1 & SG-1(N-S)

  21. Instrumentation: Single Pile Tests

  22. Sensor Locations: Single Pile Tests

  23. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • UB Progress (ST) • Equipment Setup (NE, MP) • Sand Construction & Density Control (NE) • Updated Instrumentation & Coordination (NE, ST, TA) • Non-Destructive Shaking (MP, MZ, AE) • Sloping Ground – Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

  24. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • Non-Destructive Shaking (MP, MZ, AE) • Sand Construction & Density Control (ST) • Updated Instrumentation & Coordination (ST, TA) • Sloping Ground – Simulations & Ground Motion (MG, AE) – See Presentation Part B • Decision - Pile size, thickness, etc. (July 06)

  25. Agenda – 6/27/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change - FYI • UB Progress (ST) • Equipment Setup (NE, MP) • Sand Construction & Density Control (NE) • Updated Instrumentation & Coordination (NE, ST, TA) • Non-Destructive Shaking (MP, MZ, AE) • Sloping Ground – Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

  26. Year-1 Pile - Schedule (05/15/06)

  27. Equipment & Instruments – Plan

  28. Next Meeting Date – 7/?/06 • Review of Minutes (ST, RD) • Schedule (Updated 05/2006) – No Change • UB Progress (ST) • Equipment Setup (NE, MP) • Sand Construction & Density Control (NE) • Updated Instrumentation & Coordination (NE, ST, TA) • Non-Destructive Shaking (MP, MZ, AE) • Sloping Ground – Ground Motion (MG, AE) • Decision - Pile size, thickness, etc. (July 06)

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