Abstract: A proposed airport is located in a rolling mountain and hilly area. The airport flight area is formed by cut and fill method. Different slope reinforcement schemes have a significant impact on the project investment and the original ecologic environment. According to the engineering geological conditions of the site, this paper takes the typical sections of the high fill embankment as the research object and proposes a gentle slope plan and a steep slope plan of the high slope reinforced by geosynthetics. Using GeoStudio software, the numerical simulation on the stability and deformation of different reinforcement schemes under normal working condition and rainfall working condition was carried out. The research results show that the geogrid reinforced steep slope scheme, combining with the topographical characteristics of the site, can save investment, reduce the amount of filling, and shorten the construction period under the premise of meeting requirements of civil airport project. It also lowers the impact from engineering construction on the original ecology of the site. This design idea of using favorable terrain factors to increase the slope rate provides a reference for the reinforcement design of similar high fill embankment.

Key words: Fill Embankment, Reinforcement, Geosynthetics, Stability, Numerical modelling