Determination of Lateral Earth Pressure on Bridge Abutment Provided with Geosynthetic Reinforced Approach
摘要
Bridge abutments constructed on settlement-prone soil pose a significant concern for the stability of the abutment and the settlement of bridge approaches. The settlement can occur either in the short term (elastic settlement) or the long term (consolidation settlement). In such cases, it becomes crucial to employ sustainable ground improvement techniques. Geosynthetic reinforced soil (GRS) is one such technique that has been increasingly used in bridge approaches due to its ability to reduce costs, construction time, and maintenance requirements. GRS offers lateral restraint, membrane effects, and load redistribution, making it an attractive solution for creating a stable foundation for bridge abutments and mitigating differential settlement. The utilization of GRS in bridge approach construction has gained popularity due to its ability to withstand settlement-prone soils. This technique provides stability to the bridge abutment, minimizes differential settlement issues, and offers advantages in terms of cost-effectiveness, construction efficiency, and long-term maintenance. The lateral earth pressure is a critical factor in the structural design of abutment walls, as it has a significant impact on the stability of the abutment against sliding and overturning. However, the existing literature provides limited information regarding the static lateral earth pressure development specifically in geosynthetic reinforced approaches. Therefore this study tries to evaluate the lateral earth pressure variation for abutment with or without a Geosynthetic reinforced bridge approach. A numerical finite element-based model of a real Road over Bridge is developed in Plaxis. Thereafter, the model is analyzed and lateral earth pressure under static loading scenario behind the abutment wall has been determined. To investigate the effect of geogrid parameters on the lateral earth pressure of bridge abutment, the study considers varying the axial stiffness of the geogrid layers, the spacing, and the number of reinforcement layers.