[S03A-01] Experimental and numerical study on geomaterial behavior of an uplifting belled pile under low confining pressure
Keywords:low confining pressure, belled pile, particle-element coupled method
The experimental testing has been performed in order to understand the ground behavior under low confining pressure in uplifting belled piles. The load-displacement relationship at the pile head was measured by using the 2-dimensional aluminum bar deposit testing device. The ground motions were also captured from the side and analyzed by PIV to obtain the ground deformation. Experimental testing revealed that the ground created the cone-shaped resisting area against the uplift of the belled piles.
Because it was inferred that this cone-shaped area was created due to the dilatancy characteristics of particle material, the relationship between dilatancy characteristics and the uplifting bearing capacity was investigated by using the numerical analysis, which can simulate large deformations. The series of numerical simulations resulted in that the positive dilatancy under low confining pressure induced the cone-shaped resisting area in the ground, which increased the uplifting bearing capacity.
Because it was inferred that this cone-shaped area was created due to the dilatancy characteristics of particle material, the relationship between dilatancy characteristics and the uplifting bearing capacity was investigated by using the numerical analysis, which can simulate large deformations. The series of numerical simulations resulted in that the positive dilatancy under low confining pressure induced the cone-shaped resisting area in the ground, which increased the uplifting bearing capacity.