This presentation delves into the innovative Rammed Aggregate Pier (RAP) technique as a solution to address liquefaction challenges in the field. Liquefaction, a common problem during seismic events, weakens soil and poses risks to infrastructure. Attendees will gain insights into RAP's effectiveness in stabilizing liquefiable soils. Real-world case studies and on-site demonstrations illustrate how RAP offers cost-effective and sustainable solutions for reducing liquefaction-induced risks. A must-attend for geotechnical engineers and construction professionals seeking cutting-edge techniques to enhance earthquake resilience.

1. Soil Improvement
with Geopier
Systems
6 / 9 / 2 2
J o r g e A r r o y o
G e o p i e r F o u n d a t i o n s - M é x i c o
Summary of Increased Soil Parameters
Liquefaction Mitigation Projects

2. Rammed Aggregate Pier
Displacment System
No drilling, water, air needed
Applicable Soil Types:
• Sands with water table
• Clay and silts
• Organics
• Potentially liquefiable soils
20m 500ml 50cm
Depth Construction Daily Rate Diameter

3. Large-Scale Testing of Shallow Ground Improvements using Controlled
Staged-Loading with T-Rex
S. van Ballegooy1, J.N. Roberts2, K.H. Stokoe3, B.R. Cox4, F.J. Wentz5, S. Hwang6

4. Liquefaction Mitigation of Silty Sands Using Rammed Aggregate Piers Based on
Blast-Induced Liquefaction Testing
Kyle M. Rollins, M.ASCE1; Sara Amoroso2; Paul Andersen, M.ASCE3;
Laura Tonni4; and Kord Wissmann, M.ASCE5

5. Rammed aggregate pier installation effect on soil properties
David A. Saftner PhD, Junxing Zheng PhD, Russell A. Green PhD, PE, Roman Hryciw PhD, Kord Wissmann PhD, PE,
DGE

6. Performance of Rammed Aggregate Piers as a soil densification method in sandy
and silty soils: experience from the Christchurch rebuild
Elodie Vautherin, Cédric Lambert ,Golder Associates (NZ) Limited, Christchurch, New Zealand
David Barry-Macaulay1 Atkins Limited, London, United Kingdom

7. LIQUEFACTION MITIGATION OF THREE PROJECTS IN CALIFORNIA
Tom M. Farrell, PE, GE Kyle Wallace, PE John Ho, PhD, PE, GE

8. Ground Improvement Reinforcement Mechanisms Determined for the Mw7.8 Muisne,
Ecuador, Earthquake, Miriam E. Smith, Ph.D., P.E.1; and Kord J. Wissmann, Ph.D., P.E., D.GE2
PROJECT SUBJECTED TO DESIGN EARTHQUAKE – Mw=7.8, PGA=0.4g
Please refer to GEER report (Nikolaou, S.. Vera-Grunauer, X., and Gilsanz, R. (2016). GEER-ATC Earthquake Reconnaissance, April 16, 2016, Muisne,) to see
performance comparison with non-treated embankments that failed due to soil liquefaction

9. Compilation of Post-Installation Results with TECHINT in Dos Bocas Refinery,
Mexico
José Luis Aguirre / Jorge Arroyo (Geopier-Soilsolution)
Ramón Alvarado / Uriel Ortega (Techint)
Post-Liquefaction Settlements
FREE FIELD
Post-Liquefaction Settlements
RAP IMPROVED

10. Compilation of Post-Installation Results with TECHINT in Dos Bocas Refinery,
Mexico
José Luis Aguirre / Jorge Arroyo (Geopier-Soilsolution)
Ramón Alvarado / Uriel Ortega (Techint)
ΔN with respect to FC%

11. THANK YOU
CSR
M7.5
N 1,60cs
0 10 20 30 40 50
0.00
0.10
0.20
0.30
0.40
0.50
0.60
No
Liquefaction
Liquefaction
CRR
FS = CRR
CSRM7.5
Shear
Stiffening
Densification + Lateral
Stress Increase