ABSTRACT
A three-dimensional discontinuous deformation analysis (3D DDA) computer program has been used to perform a parametric study of wedge stability. The parameters considered include the shape of the wedge, its orientation, and the friction angle between the wedge block and its bounding surfaces. The failure modes computed by 3D DDA are summarized in failure mode distribution charts. Failure modes obtained include planar sliding, wedge sliding, free falling, torsional sliding and rotation after some small movement. Planar sliding and free falling modes are more prevalent than wedge sliding and torsional sliding modes and the mode of rotation after some movement. Thinner wedges tend to be less stable and have a higher tendency to slide torsionally than thicker ones. However, thicker wedges tend to give more cases of rotation after some small movement. Finally, a larger friction angle promotes stability and rotation of the wedge.
