The discontinuities are considered to be ubiquitous: in other words, they can occur at any location in the rock mass.The implication is that no new cracking is required in the analysis of wedge movement. Discontinuity surfaces are assumed to be persistent and to extend through the volume of interest Therefore the discontinuities defining the wedge do not terminate within the region where the wedges are formed.All of the discontinuity surfaces are assumed to be perfectly planar.If more than three major planes are identified for the analysis of the structural data, all combinations of these planes should be considered. A maximum of three structural planes can be analyzed at one time. The wedges are tetrahedral in nature and defined by three intersecting discontinuities.It is assumed that displacements take place at the discontinuities and that the wedges move as rigid bodies with no internal deformation or cracking.
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