Abstract: The Environmental Homogeneous Plastic (EHP)pile is a new cement-soil mixing pile type with the controlled physical and mechanical properties. The pile is installed by injecting the environmentally friendly homogeneous plastic materials into the borehole. The new material for the pile has the advantages over the soil-cement mixed columns that usually have the issues of non-uniform, discontinued column shafts and low shaft strength. The field static plate loading tests were performed on composite soil and piles mixed with three different cement contents: 8%, 10% and 13% and the test results were compared with the conventional composite ground formed by the conventional soilcement mixing columns.The results show that neither the single pile nor the composite foundation is loaded to failure, and the load settlement curveshave gradual deformation pattern.The cumulative settlement under the maximum load decreases with the increase of the cement content as a power function. At the same cement content, the deformation resistance of the EHP pile and composite foundation is better than that of the conventional soilcement mixing columns, and the cement ratio can be reduced when the improvement effect is evident. The axial bearing capacity of EHP single piles and the composite foundations can meet the design requirements as well as cost effective for the project.

Key words: Environmental Homogeneous Plastic Pile, Composite Foundation, Axial Capacity, Static Load Test