Abstract: This paper presents a case study of the effect of the compactive efforts in soil induced by hollow prestressed reinforced concrete piles. The physical and mechanical properties of soils and Standard Penetration Test (SPT) numbers before and after the pile installations are compared. The test results indicate that the installation of these piles can effectively eliminate the liquefaction potential and improve the engineering properties of the soil among piles. The strength of the soil and the SPT N values increase and the compressibility decreases after the pile installation. The results also show that more compactive effects can be found in silty and sandy soils than that of clayey soils. The compactive effective is also reversely correlated with the clay content in soils, plastic indices.

Key words: Hollow Square Concrete Piles, Compactive Effect, Liquefaction