Stability Assessment of Failed Embankment on Soft Soils
摘要
Evaluating the stability of a road embankment is crucial. The issue of selecting appropriate soil for man-made slopes plays a significant role in maintaining stability. A published case study on the failure of an interstate connecting-ramp embankment during construction on soft soil in Medina County, Ohio, predicted the development of cracks due to soft soil, leading to failure. The primary objective of this paper is to investigate the causes of the ramp's failure, as well as to recommend appropriate remedial measures for their implementation to protect the ramp for the future. Plaxis 2D is used for performing numerical analysis to analyse the embankment. The study examines various parameters, such as the factor of safety, displacement, deformation, and excess pore pressure, with and without reinforcement on the embankment. The case study initially indicated that crack development is the primary cause of embankment failure. However, the present investigation found that effective use of reinforcement can reduce crack development and improve embankment stability. The combined use of geogrid and drainage blanket improves stability by lowering displacement and pore-water pressure, leading to an increase in the factor of safety. Therefore, embankment stabilization can be achieved through the implementation of a drainage blanket without geogrid, which is a cost-effective method for improving stability.