Centrifuge modeling on the slope stability reinforced by C-RHA piles

Rice husk ash (RHA) is a commonly found pozzolanic material that has been used as a partial substitute for cement to reduce greenhouse gas emissions. Concrete-rice husk ash (C-RHA) piles can become an eco-friendly and cost-efficient slope reinforcement alternative. Therefore, a series of centrifuge modeling tests were conducted to understand the stabilities of precast and cast-on-site C-RHA pile-reinforced slopes when subjected to gravity loading. The results show that the precast construction method more substantially improves the slope stability immediately after construction because the precast pile strength peaks before the cast-on-site concrete is fully cured. Moreover, the cast-on-site C-RHA pile-reinforced slope is much more stable after the mixture is fully cured because the grout material creates better bonding between the pile and the surrounding soil as it seeps into the surrounding soil, improving the slope strength and stability.