Model Study on Improvement of Subgrade/Sub-base Material by Embedding Geocell at Varying Depths for the Pavement

This study investigates the impact of incorporating grid geocells at varying embedment depths within a low plastic clay subgrade and aggregate-based sub-base on flexible/rigid pavement performance. Four cases were examined: (1) unreinforced soil, (2) a composition of 1/3 aggregate and 2/3 soil layers, (3) geocells placed at different depths within the 1/3 aggregate layer, and (4) geocells placed at different depths within the 2/3 soil layer. Rigorous testing, including K value tests, plate bearing tests for rigid pavement, and California bearing ratio (CBR) tests for flexible pavement were carried out to assessed load-bearing capacity and structural behaviour. Results indicated significant enhancements in load-carrying capacity, k value, CBR, and resilient modulus values with geocell inclusion, particularly at greater embedment depths. The findings underscore the effectiveness of geocell reinforcement in improving the structural performance, stiffness, and durability of flexible pavements, providing valuable insights for sustainable and resilient pavement design and construction practices.