Abstract:

JG(jet grouting) soil-cement-pile strengthened pile, simply called JPP pile, is a new sort of composite pile used in soft foundation. It may improve the vertical bearing capacity effectively; and it has been practically used in a considerable scale. In order to study the behaviors under lateral load, large-scale model test is carried out, using large test room made by Hohai University. It is shown that the JPP pile could improve horizontal bearing capacity by about 15% compared with bored concrete pile; and the biggest bending moment of JPP pile is located in the place 2 m below the pile tip; and lateral earth pressure is concentrated in the top 2 m soil. Meanwhile, with a cap added, JPP pile has a much higher horizontal bearing capacity. According to the formula for bored concrete pile based on m method, which standard remmends, horizontal bearing capacity of JPP pile has been calculated; and calculation results basically coincide with the experimental results. The results may be useful for the practical engineering and analysis of JPP pile in the similar soil layer.

Key words: JPP pile, horizontal bearing capacity, large-scale model test, lateral earth pressure