Abstract: This typical building site with saturated and thick miscellaneous fill is in a Yellow River alluvial plain in Jinan City. The site was a borrow pit for a brick kiln, which was abandoned many years ago. The maximum thickness of the miscellaneous fill is 13.2 m. This miscellaneous fill soil layer contains a large number of construction waste, some of which are large blocks and steel reinforced concrete blocks. The project includes five buildings varying 3-7 stories with one underground basement. The maximum depth of the foundation excavation is 6.80 m. This article shows the engineering investigation, the dynamic compaction, the down-hole dynamic compaction, the dewatering-draining methods and the design of the deep excavation supporting structure comprehensively. It is summarized that the impact method is the most feasible for the down-hole dynamic compaction. The full-length casing follow-up rotary excavation is the best construction technology for the installation of the dewatering point well, etc. The range of the dynamic compaction and foundation excavation are discussed in detail. The in-depth discussions also include of how the system of the dewatering point well coordinates with the dynamic compaction, the down-hole dynamic compaction, the dewatering-draining methods as well as the deep excavation supporting structure. All of the above might provide some reference to the constructions with the similar miscellaneous fill sites.

Key words: Saturated Miscellaneous Fill, Down-Hole Dynamic Compaction, Impact holing Method, Dewatering Point Well, Full Casing Follow-up Rotary Excavation, Supporting Structure of Deep Excavation