The Down-Hole Dynamic Compaction and the Supporting and Dewatering of Deep Excavation in a Building Site with Thick and Saturated Miscellaneous Fill
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 sup-porting 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 de-watering 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 a-bove might provide some reference to the constructions with the similar miscellaneous fill sites.
Saturated Miscellaneous FillDown-Hole Dynamic CompactionImpact holing MethodDewatering Point WellFull Casing Follow-up Rotary ExcavationSupporting Structure of Deep Excavation
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