Bearing characteristics of single pile with new construction between pile 's top and bearing plate

Key words:  dry powder cement single pile  composite foundation  cushion  bearing capacity of soil surrounding piles

Abstract:

In order to improve the bearing capacity of composite foundation, a new type of construction between the top of pile and bearing plate was proposed for the first time. A polystyrene foam board with the thickness of 10 mm was pasted on the top of pile, and the sand cushion layer with the thickness of 150 mm was placed on it. The static load tests under different states were done in Weihao Central Park in Dongying,Shandong province. The comparable research on the dry powder cement single pile in composite foundation and the free single pile was done. The results show that the capacity of dry powder cement single pile in composite foundation is much higher than that of a free single pile. The new type of construction between the pile top and bearing plate could mobilize the bearing capacity of soil effectively, and reduce the stress concentration at pile top. In the meantime, the soil surrounding the piles was compacted earlier than that of coventional composite foundation under the same load, which would make piles and soil settle together. The post construction settlement may be reduced.