In situ evaluation and analysis of improvement effects of pervious concrete pile on alluvial silt ground

Abstract

ABSTRACT Since the concept of pervious concrete pile (PCP) was put forward as a technology of ground improvement, some numerical simulations and small-scale tests have been performed to study the properties of PCP composite foundation. However, this technology has not been implemented in field. In this work, PCPs were installed by employing the method of vibrating-sinking tube and a series of tests are performed to evaluate the properties of PCP composite foundation. The tests on pile cores indicate the method of vibrating-sinking tube is suitable for installation of PCP. Compared with gravel column and soil-cement mixed pile, PCPs significantly increase the time rate of consolidation, improve the bearing capacity of composite foundation and increase pile-soil stress ratio. PCPs can also effectively reduce the acceleration and excess pore water pressure induced by vibration, and thus mitigate liquefaction of ground and reduce the damage of upper structure. This work is helpful for the design and installation of PCP.