جستجوی مقالات مرتبط با کلیدواژه "geometrical modeling" در نشریات گروه "مهندسی معدن"

Due to technological progress and consequently the development of numerical methods in solving problems, numerical methods have found a special place in various sciences especially rock mechanics. Numerical methods can be used according to the type of medium used as a combination that so-called hybrid methods. According to studies on slope stability analysis, displacement discontinuity method for crack growth and discontinuous deformation analysis method for modeling large displacements as combination was found suitable. Hence first by providing flowchart of how the combination of these two methods, with geometrical modeling using random disks method and infinite joints method in the program coding in the Mathematica environment, to crack growth in the geometrical model created by random discs coded in the Mathematica program deals and finally, stability analysis was conducted in the DDA and UDEC software. It is worth mentioning, the case studies used in this study was tectonic block 4 Choghart and according to the comparison be made can clearly capabilities discontinuous deformation analysis method than the discrete element method in modeling large displacements observed. It is worth mentioning that crack growth creates geometric model is different and follow different results in the slope stability analysis.

One of the most critical factors for estimation of cavability in prefeasibility stage in caving extraction methods is evaluation of In situ fragmentation. Poor estimation of this variable can lead to production and processing problems, or in the worst scenario, failure of the project. In recent years with help of new stochastic discontinuity geometrical modeling, joints those are the main factor for in situ fragmentation, modeled more in tune with reality. Often in nature, discontinuity persistence especially in joints is not infinite. This has a great impact on the cavability of ore bodies. In a new recent stochastic geometrical modeling that is named discrete fracture network (DFN), discontinuities modeled finite that is more in tune with reality. Mathematica Software is selected for writing 2dimensional discrete fracture network code (DFN2D), because of its good graphics and calculations abilities. This code (DFN2D) has good different abilities like producing of numerical and graphical outputs, making finite and infinite joints models, defining of complete blocks with computation of their areas from joints intersections, consideration of joints hierarchies, production of suitable outputs for numerical codes like UDEC & PFC2D and statistics outputs of any model geometrical parameters. With processing of information from joint study in a copper mine and fitness of well probability density functions for any geometrical parameters of joint sets, 2D geometrical modeling with DFN2D was made. Statistics outputs from model and joint intensity and density had a good fitness with reality (input data). In situ fragmentation computed from area of complete blocks also rate of blocky area is defined.