...-elastoplastic numerical model. The Drucker-Prager/cap plasticity model, by which both shear compressive plastic deformation and volumetric plastic deformation can be taken into account, is employed to more precisely characterize the mechanical behavior of weakly consolidated rock formations. Possible...

... stress condition. The third type of model is based on plasticity theory (Nicolae, 1999; Zicnkiewicz and Cormeau, 1974; Cristescu, 1991). The viscous deformation and the plastic deformation are integrated as viscoplastic deformation. The viscoplastic coefficient that determines viscoplastic deformation...

... Reservoir Characterization Upstream Oil & Gas energy release rate fluid pressure hydraulic fracturing Engineering crack length reservoir geomechanics fracture mechanics oil reservoir geometry crack propagation structural geology plastic deformation crack tip critical pressure...

... and surface construction. Nayroles et al. [9] has used MLS to construct shape function and named it diffuse element method (DEM). DEM was modified by Belytschko [10] and who named it the element free Galerkin method. new formulation interpolation function plastic deformation Galerkin Method...

...-plasticity; Thermodynamics; Micro-Macro structures. 1. Introduction In most rock materials, two types of inelastic behavior can be generally identified, the plastic deformation related to sliding mechanisms inside the microstructure of rock matrix and material damage induced by growth of micro-cracks...

... of material strength and supporting capacity in pseudo-triaxial stress slate. The material rchngth~s a,decreasing function with plastic deformation, but the variation of supporting capacity is very complex with the loading scr , which influence specimen's deformation greatly. In this paper, experiments...

.... size effect permanent ship-lock slope Gorge Project geological action plane plastic deformation tensile strength Reservoir Characterization initial ground stress deformation modulus loading strength SSR arc mechanical characteristic excavation graph rock mass deformation A study...

... prediction ~rnerta of rock burst, possibility of rock burst occurring during eep mlnmg excavation in the mine is analyzed. 2. PREDICTION BASED ON TEST RESULTS OF MECHANICAL PROPERTIES OF ROCK 2. 1 Uniaxial cycling compressive test results Compression will cause elastic and plastic deformation, and energy...