Abstract: This project is located in Yunnan Province. The original site terrain has significant variation in elevations with well-developed erosion gullies with depth up to 20 meters deep. During the site preparation, the site fill height would vary from 10 to 35 meters. Due to the tight construction schedule, the site would be filled immediately after the site grading was completed. Since the project main structure construction and the roadway retaining wall were located in the fill area, so that that soil improvement for the post construction settlement mitigation were critical to the success of this project. After the feasibility and cost comparison of various soil improvement methodologies, dynamic compact method and the layer compaction plus geogrid reinforcement methods were finally selected. After the completion of the project, the settlement monitoring was lasted for four years and the results showed that the site initial settlement after construction was relatively small and meets the design and engineering requirements.

Key words: High Fills, Dynamic Compaction, Layered Compaction, Settlement