Influence of Underlying Crushed Rock Layer on Compacting Effect of Jacked Pipe Pile

Abstract:

Influence of underlying crushed rock on compacting effects and bearing capacity of jacked pipe pile was analyzed by general finite element method ABAQUS. Change rules of ground upwarping, ground horizontal displacement, compressive stress of pipe pile and foundation around it were discussed under the condition of different penetration depth of pile. Results show that installation of jacked pipe pile will result in ground upwarping around piles, and as the distance to the pile side is increasing, ground upwarping effect is weakening quickly. Installation of jacked pile will cause remarkable horizontal soil compacting effect around it. When jacked pipe pile is penetrated into underlying crushed rock, deformation effect of it around pipe pile is obviously weaker than that of soft foundation because stiffness of crushed rock is larger than that of soft foundation. The bearing capacity of pipe pile can be significantly increased, when the crushed rock layer is as bearing layer.

Key words:jacked pipe pile; crushed rock layer; numerical analysis; displacement penetration method; compacting effects