The Mechanical Analysis of Jointed Rock Mass Using Meshless Method with Enforcing Modified penalty Method

The methods based on meshes are not suitable for conventional computational methods such as finite element or finite difference when large deformations and large number of discontinuities are involved. The conventional process for dealing with moving discontinuities in these methods is to remesh the domain in each step of the process which heads in reduction of speed and degradation of accuracy and complexity of the calculations. To overcome these problems the meshless methods are introduced and applied which are found very suitable for problems with changeable geometry. There are a number of meshless methods, such as the Element Free Galerkin (EFG) method. In this paper EFG method in used for the mechanical analysis of intact rock mass and jointed rock mass, the modified penalty method is used for essential boundary condition, and good results were obtained. The method based on meshe such ad FDM and FEM have other difficulties such as bad geometry, because of mull of domain or joint creation. Also the time of calculation for EFG method is less than that for mesh-based methods such as FDM . It is found that the present method more suitable for modeling discontinuities of rock mass in two-dimensional and particular three-dimensional domains than conventional methods based on meshes.

کلیدواژه ها:

Numerical Method ، Rock Meshanics ، Meshless ، Element Free Galerkin