Quantitative benefits of geocells in controlling liquefaction in sands

• Published in: Soil dynamics and earthquake engineering (1984) 2025-01, Vol.188, p.109098, Article 109098
• Main Authors: Krishnaraj, Prerana, Latha, Gali Madhavi
• Format: Article
• Language: English
• Subjects: 3D printing; Cyclic loading; Geocell; Liquefaction; Post-liquefaction
• ISSN: 0267-7261
• DOI: 10.1016/j.soildyn.2024.109098

Geocells have become an integral part of many geosystems like road and railway embankments, retaining walls and foundations, attributed to their multiple merits in terms of stability and strength, but their contributions towards liquefaction mitigation are unknown. The present study aims to understand the role of geocell reinforcement on the liquefaction and post-liquefaction shear response of saturated sands through monotonic and cyclic triaxial tests. Low-strength geocells of required physical and mechanical properties were fabricated through ultrasonic welding of 3D printed polypropylene (PP) sheets. The liquefaction benefits of including a single geocell in sand were quantified in terms of the reduction in pore water pressure, retardation in stiffness degradation and delay in the retardation of effective stress. In general, the inclusion of geocells delayed liquefaction, with higher beneficial effects at lower initial confining pressure, higher cyclic strain amplitude and higher cyclic loading frequency. The maximum benefit measured in terms of percentage rise in the number of cycles needed to liquefy was calculated to be about 230 %. Geocell reinforcement also helped in the quick regain of post-liquefaction shear strength and stiffness. •Liquefaction response of geocell reinforced sands is studied through undrained cyclic triaxial tests.•Polypropylene geocells are fabricated through 3D printing and ultrasonic welding.•The pre-liquefaction, liquefaction and post-liquefaction response of the unreinforced and geocell reinforced sand specimens is compared.•The effects of initial confining pressure, cyclic axial strain amplitude and frequency of the loading on the liquefaction response of unreinforced and geocell reinforced sands are analysed.•Geocell reinforcement is found to be effective in delaying liquefaction and quick regain of shear strength after liquefaction.