Rockfalls strongly influence the evolution of steep rocky landscapes and represent a
significant hazard in mountainous areas. Defining the most probable future rockfall source …

The extent of the loosening zone in tunnels excavated through columnar jointed basalts is
studied with the numerical discontinuous deformation analysis (DDA) method. The structure …

Toppling is a mode of slope instability that may occur in a wide range of layered or blocky
rock masses. If this instability is caused by some natural or man-made external factors, it is …

Based on the mathematical grid of 4-node tetrahedral finite element form, the dual cover
system, weight function and displacement function of three-dimensional numerical manifold …

When a slope consists of a horizontal weak rock or soil overlaid by some vertical strong
slender rock columns, the slope is prone to a secondary toppling failure which is known as …

Abstract In the classical Discontinuous Deformation Analysis (DDA) the contact conditions
are enforced by what is referred to as open–close iteration. The open–close iteration …

The two-dimensional discontinuous deformation analysis (DDA), as a discrete numerical
method, has been successfully used to simulate many rock mechanics and rock engineering …

The numerical, discrete element, Discontinuous Deformation Analysis (DDA) method was
developed by Dr. Gen-hua Shi while he was working at the University of California …

One of the most important instabilities of rock slopes is toppling failure. Among the types of
toppling failure, block-flexural failures are more common instability which occurs in nature. In …

Overhanging rock slopes (steeper than 90°) are typically avoided in rock engineering
design, particularly where the scale of the slope exceeds the scale of fracturing present in …