Optimization of grouting method and axial performance of pressure-grouted helical piles

Pressure-grouted helical pile (PGHP) is an innovative piling system that allows a significant increase in capacity with relatively low additional cost. The constructed by applying pressurized grout during the installation of conventional piles. injected into ground through two nozzles welded to hollow shaft. This paper presents comprehensive laboratory study investigate effect three different nozzle configurations on shape and axial performance PGHP. results reveal PGHP shaft resistance over un-grouted due formation continuous column larger diameter, higher friction angle at pile–soil interface, lateral earth pressure around pile. diameter created depend configuration used for injection. An end-bearing observed dissipation supporting soil voids. also shows PGHPs installed third have fastest rate highest compression pullout resistances. Thus, recommended construction.