Of the parameters which have been investigated, the most important parameter was found to be the reservoir water level. the reservoir water level, the shear stiffness of the slide surface, the rock mass strength, the rock mass deformability and rock joint patterns. The influence of several parameters was investigated in 2D, namely. In this study, a strength reduction approach was used to calculate the slide surface friction angles required for stability. Two-dimensional (2D) and three-dimensional (3D) DEM models were constructed based on information published in the literature. To scale down the size of the wedges according to actual field observations (e.g., observed joint trace lengths), use the Scaling Wedges options.The 1963 Vajont rock slide is studied using the distinct-element method (DEM). UnWedge always initially calculates the maximum-sized wedges that can form around the excavation.However, you may include the effect of in-situ stress on the wedges with the Field Stress option.
While this assumption leads to some inaccuracy in the analysis, the error is generally conservative, leading to a lower Factor of Safety. By default, the stress field in the rock mass surrounding the excavation is not taken into account. The default analysis is based upon the assumption that the wedges are subjected to gravitational loading only.The underground excavation is assumed to have a constant cross-section along its axis.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. UnWedge should be used to analyze wedge failure around excavations constructed in hard rock where discontinuities are persistent and where stress-induced failure does not occur.There are some important limitations and assumptions of the UnWedge program that should be considered when interpreting the results: Automate from Excel: Probabilistic Analysis.Automate from Excel: Deterministic Analysis.Compute All Joint Combinations (Probabilistic).
0 kommentar(er)
