Advanced technology for foundation treatment of large thickness backfill

The project of a large-scale exhibition center in Changchun City covers an area of approximately 500,000 square meters. The original terrain of the construction site is undulating with a maximum height difference of about 20 meters. The apron needs to be leveled by cutting and filling to achieve the designed elevation. After leveling, the thickness of the fill soil on the site is uneven, with the maximum thickness reaching 16 meters. The fill area needs to be backfilled, leveled and have its foundation treated according to the intended function and bearing requirements. Combining the site’s geological conditions, fill thickness, and the intended function of the planned buildings (structures), applying the concept of green foundation, the foundation treatment is carried out in different areas using a combination of methods such as dynamic compaction, impact rolling, crushed stone piles, mixing piles, and lime-soil cushion layers. The construction inspection of foundation treatment, post-construction settlement monitoring of the building, and project operation status all indicate that the treatment effect of the thick backfilled foundation for this project meets the design and specification requirements. It has solved the problems of construction quality and post-construction settlement of thick backfilled soil, achieved the goals of safety, reliability, economic rationality, and can provide a reference for similar projects.