1. NEES-Pile: Experimental and Computational Study of Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading COMPARISON BETWEEN CENTRIFUGE AND REAL SCALE MODEL TESTS: LG0 - SG1 By
Student: Marcelo Gonzalez
Professor: Tarek Abdoun
Rensselaer Polytechnic Institute
August 20th, 2007

2. Table of Contents BUFFALO REAL SCALE TABLE OF CONTENTS: Water, 1 cp
SIMULATION OF LG0
1.1 Model configuration, soil properties, Instrumentation and centrifuge model preparation.
1.2 Input acceleration.
1.3 Time History responses.
1.4 Stress – Strain responses.
2.1 Model configuration, soil properties, Instrumentation and centrifuge model preparation.
2.2 Input acceleration.
2.3 Time History responses and profiles of the data.
2.4 Stress – Strain responses.
3. DISCUSSION
Water, 1 cp
K= 1E-2 cm/sec
DR = 55%

3. SIMULATION OF LG0 SIMULATION LG0 BUFFALO REAL SCALE Water, 1 cp
K= 1E-2 cm/sec
DR = 55%
SIMULATION OF LG0

4. Soil Properties and Instrumentation LG0
D50 = mm
D10 = mm
FC = 0.1%
e min = 0.608
e max = 0.800
Gs = 2.665
K = 1 x 10-2 cm/sec, 40%DR
(Gonzalez M., 2006)

5. Model Configuration LG0 High Speed Camera 0 cm Left Right
6.0 cm (1.50 m)
7.5 cm (1.88 m)
14 cm (3.50 m)
19 cm (4.75 m)
21.5 cm (5.38 m)
Pore Pressure
LVDT
Accelerometer X
Accelerometer Y

6. Dry sand pluviation method
Model Preparation
LG0
Dry sand pluviation method
BUFFALO REAL SCALE
Outer chamber
(vacuum = 100 kPa)
sand
Latex Membrane
acelerometer
Ottawa sand
Latex Membrane
acelerometer
Model Saturation System
Ottawa sand
Chamber Vacuum
Inner (90 kPa)
Outer
(100 kPa)

7. Results: Input Acceleration LG0
TIME CONSIDERED IN THE ANALISIS

8. Results: Acceleration in the rings LG0
INPUT ACCELERATION
ACR5
ACR4
ACR3
ACR2
ACR1

9. Results: Acceleration in the soil LG0
INPUT ACCELERATION
ACCR5
ACCR4
ACCR3
ACCR2
ACCR1

10. Results: Excess Pore Water Pressure LG0
INPUT ACCELERATION
PWC5,PWU3
PWC4, PWD2
PWC3, PWU2
PWC2, PWD1
PWC1, PWU1

11. Results: Excess Pore Water Pressure Dissipation LG0
INPUT ACCELERATION
PWC5,PWU3
PWC4, PWD2
PWC3, PWU2
PWC2, PWD1
PWC1, PWU1

12. Results: Lateral Displacement in the soil LG0
INPUT ACCELERATION
LVR5
LVR4
LVR3
LVR2
LVR1

13. Results: Stress – Strain Loops LG0
Strain – Stress Loops
Calculated by considering Soil Accelerometers and Inertia of the ring correction
0-12sec
GSI 1.0

14. Results: Shear Wave Velocity LG0
Centrifuge
University of Buffalo
No ring inertia effect
No degradation effect
No ring inertia effect
No degradation effect
A. Elmekati, 2007
A. Elmekati, 2007

15. SIMULATION SG1
SIMULATION OF SG1

16. Results: Strain – Stress Loops LG0
The same configuration and preparation method than LG0 was used to create SG1.
The only difference was the inclination angle.
Model inclination angle = 2 degrees
Prototype inclination angle = 5 degrees

17. Results: Input Acceleration SG1

18. Results: Acceleration in the rings SG1
2.25m, ACR4
5.38m, ACR1
4.75m, ACR2
3.50m, ACR3
1.50m, ACR5
INPUT ACCELERATION

19. Results: Acceleration in the soil SG1
1.50m, ACCR5
2.25m, ACCR4
3.50m, ACCR3
4.75m, ACCR2
5.38m, ACCR1
INPUT ACCELERATION

20. Results: Excess Pore Water Pressure SG1
1.50m, PWC5
2.25m, PWC4
3.50m, PWC3
4.75m, PWC2
5.38m, PWC1
INPUT ACCELERATION

21. Results: Lateral Displacement in the soil SG1
1.50m, LVR5
2.25m, LVR4
3.50m, LVR3
4.75m, LVR2
5.38m, LVR1
INPUT ACCELERATION

22. Results: Lateral Displacement in the soil SG1
Event1 (E1): Between 5.30 and 5.6 sec
Event2 (E2): Between 5.75 and 6.0 sec
Event3 (E3): Between 6.20 and 7.3 sec
Event4 (E4): Between 25.0 and 30.0 sec E3 E2 E1
1.50m, LVR5
2.25m, LVR4
3.50m, LVR3
4.75m, LVR2
5.38m, LVR1
INPUT ACCELERATION

23. Results: Lateral Displacement in the soil SG1
Event1 (E1): Between 5.30 and 5.6 sec
Event2 (E2): Between 5.75 and 6.0 sec
Event3 (E3): Between 6.20 and 7.3 sec
Event4 (E4): Between 25.0 and 30.0 sec E4
1.50m, LVR5
2.25m, LVR4
3.50m, LVR3
4.75m, LVR2
5.38m, LVR1
INPUT ACCELERATION

24. Results: Lateral Displacement in the soil SG1

25. Results: Lateral Displacement in the soil SG1
6sec
27sec
4sec
5.5sec

26. Results: Stress – Strain Loops SG1
Strain – Stress Loops
Calculated by considering Soil Accelerometers and Inertia of the ring correction
GSI 1.0
SAA
NO RING CORRECTION

27. Results: Shear Wave Velocity SG1
centrifuge
University of Buffalo
A.Elmekati, 2007

28. Discusion SG1
Thank you