Abstract: This paper presents a case history of the application of Prefabricated High strength Concrete (PHC) pipe piles in the improvement of liquefiable soils. The performance of the PHC pipe pile composite ground under the seismic loading is numerically simulated by the commercial software FLAC3D. Results are also compared with castinplace reinforced concrete piles. The results indicate that, the PHC pipe pile can improvement the performance of the composite ground. The degree of liquefaction is 0.20 for the composite ground and 0.48 for the ground without treatment. The dynamic analysis indicate that the PHC pipe pile has a better performance in the liquefiable soils over that of the castinplace reinforced concrete piles.

Key words: PHC Pipe Piles, Composite Ground, Seismic Liquefaction, Numerical Simulations