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The stability analysis of man-made rock slopes is one of the oldest geomechanical problem, the solution of which has been given considerable attention for many years all over the world. The violation of slope stability is the cause of a landslide–a sliding displacement of rock masses down the slope according to the gravity influence. Landslides occur in any part of a slope due to an imbalance in rocks caused by: an increase in the steepness of the slope because of water washing; weakening of the strength of rocks during weathering or waterlogging by precipitation and groundwater; seismic impact etc. Largely one of the landslide causes is human activity. The main damaging factor of landslides is vast masses, falling asleep or destroying everything in its motion path. Therefore, the list of research papers on the prediction of the landslide occurrence and its consequences includes many hundreds, and their number will not decrease now. Most of them are connected with attempts to build some optimal surface in the body of the slope, along which, most likely, collapse will occur if the equilibrium state of the massif is disturbed. Numerous, sometimes very complex, methods for constructing this surface are used, which, in fact, are not far from the first, simplest approaches based on straight-line (broken) and circularly cylindrical shear surfaces. This paper presents a computer approach to assessing the landslide situation based on the Smoothed Particle Hydrodynamics method (SPH). The scientific and practical value of developing such a computational approach to studying the danger of slope massifs deformation lies in the fact that it does not require a priori assignment of possible places of landslide localization, as is needed in most methods for describing landslides. The proposed computer simulation approach provides researchers with a tool that helps them make scientifically based decisions to evaluate the critical characteristics of the mining. [ABSTRACT FROM AUTHOR]

The relevance of research is driven by the need to expand the possibilities of an explosion action controlling to obtain a rational rock mass fragmentation, the requirements to improve the safety of mining working, as well as the economic feasibility of reducing the loss of minerals and eliminating negative environmental factors of blasting. The paper presents some regularities of the radial air gap value influence for the TNT and ANFO charges on the yield of fractions during geo-environment explosive failure. The investigation were carried out experimentally on compositional models and numerically by the Smoothed Particle Hydrodynamics method (SPH). The article considers the methodological issues of combined application of compositional axisymmetric models and computer simulation for dynamic loading problems solving of the massive to identify patterns of stress localization and rock fragmentation. The research results made it possible to determine the dependences of the change in the middle rock piece and the yield of fines on the radial air gap value. In addition, the influence of the distance to the charge on the yield of the middle rock piece at different explosive densities was established. The developed research methodology makes it possible to determine numerically the influence of various factors on the nature of stress localization and to identify the trigger effect of the geo-environment explosive failure. The results comparison of processing physical experiments and computer simulation shows that the chosen approach ensures the reliability of the research results and turned out to be very useful for analyzing and better understanding the rock massive explosive failure mechanics. The results comparison for physical experiments processing and computer simulation shows that the chosen approach ensures the reliability of the research results and turned out to be very useful for analyzing and better understanding the rock massive explosive failure mechanics. [ABSTRACT FROM AUTHOR]

To solve an urgent problem in the coal industry - forecasting emergency hazardous phenomena in mine workings, taking into account the geodynamic activity of the coal seam, it is advisable to represent such a coal seam in the form of some energy-saturated medium, capable of collapsing under certain conditions and releasing a significant amount of kinetic energy into the array. Based on the results of computer calculations for a particular scheme of drilling and blasting operations, it is possible to identify the moment and place of the outburst origin and evaluate the consequences of filling the working space with crushed coal masses and methane. The paper proposes a new model for modeling the entire ejection process. The model integrates well-developed numerical approaches: the finite element method and Euler solver and the Smoothed Particle Hydrodynamics (SPH) method. The first explicitly simulates the deformation, destruction and destruction of a solid, and the second simulates the flows of an ejected mixture of coal, rock and gases, the third is convenient for simulating explosive charges. The interaction and behavior of geomaterials with different physical and mechanical properties in a coupled model under dynamic loading are illustrated. A simple example is presented to simulate a coal and gas outburst process to demonstrate the potential of a coupled model. The results obtained for various parameters of energy saturation can be applied to the study of the regularities of the occurrence and course of the outburst phenomena. At the same time, the capabilities of the SPH method were tested as part of a combined computational approach for computer calculation of the stress-strain state of a coal-bearing rock mass, taking into account the possibility of an outburst. The main task was to obtain adequate results of the consequences of drilling and blasting operations in a rock mass near an outburst-hazardous coal seam. [ABSTRACT FROM AUTHOR]

A process of the development of rocks discontinuous displacement, which can occur under man's impact in fractured rock massif in the gravitational field in the vicinity of steep sides of deep pits and slopes is considered. The shift of the rock mass manifests itself in the formation of a characteristic spatial structure. In this regard, the problem of finding a characteristic surface that determines the movement of collapsing rock mass in a stress-strain rock massif is very relevant. To evaluate the consequences of the behavior of the fractured slope structure on the formed shear surface, a new computational approach is proposed. The calculations carried out represent quite accurately the processes of deformation and fracture development in the vicinity of the quarries faces and edges, without specifying a priori the most probable location of the rock displacement surface appearance in the massif. It is shown that the identified line of movement is closest to the brachistochrone, which corresponds to the physics of the motion of material points in the gravitational field. [ABSTRACT FROM AUTHOR]