In this work, the effect of rock bolt angle on the shear behavior of Rock Bridges is investigated using the particle flow code in two dimensions (PFC2D) for three different Rock Bridge lengths. Firstly, the calibration of PF2D is performed to reproduce the gypsum sample. Then the numerical models with the dimensions of 100 mm * 100 mm are prepared. The Rock Bridge is created in the middle of th...

No prior research has documented the different types of rock coatings in Yosemite Valley, despite the evident black streaks down Yosemite Falls, the light granitic rock exposed by recent rock falls contrasting with dark rock coatings, and the millions of visitors who have photographed the coated rocks of Yosemite. This paper identifies the types of rock coatings found on Half Dome, in Yosemite ...

Abstract This work proposes a finite volume scheme for two-phase Darcy flow in heterogeneous porous media with different rock types. The fully implicit discretization is based on cell-centered, as well face-centered degrees of freedom order to capture accurately the nonlinear transmission conditions at type interfaces. These play major role dynamics. formulated natural physical unknowns, and no...

Evaluation of blasting-induced rock damage and fragmentation is very important for safety control construction in the jointed mass. The discontinuous numerical models are commonly applied due to advantages modeling treating discontinuities. In this paper, fracturing algorithm rate dependent strength law incorporated into deformation analysis (DDA) study wave propagation phenomena dynamic proble...

In situ fluidization mining is a promising method which shows considerable potential for reducing the ecological influence impacts of coal mining. During mining, gangue will be separated from ores, filled back, and returned to excavation region, which, depending on filling rate, greatly reduces stratum deformation strata, rate. Numerical simulations can assist engineers in evaluating optimizing...

Majiagou landslide, a major ancient landslide in Three Gorges Reservoir region, is located the high earthquake area of southwest China. The 2013 Badong caused an obvious deformation monitored by sliding inclinometer. A strong may induce reactivation landslide. So, it necessary to research seismic dynamic response For this purpose, discontinuous analysis (DDA), improved introducing artificial jo...

Introduction: We have completed analysis of a new near-field rock count at the Mars Pathfinder landing site and determined that the previously published [1,2] rock count suggesting 16 % cumulative fractional area (CFA) covered by rocks is incorrect. The earlier value is not so much wrong (our new CFA is 20%), as right for the wrong reason: both the old and the new CFA’s are consistent with remo...

Original scientific paper Rock burst is a common serious geological hazard in underground engineering, which seriously affects the progress of projects. The mechanism of rock burst can be explained by the distribution law of rock fragments and its fractal characteristics. A simulation experiment of rock burst was conducted with the granite samples under a biaxial loading machine system to analy...