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Distinct element modelling of fracture plan control in continuum and jointed rock mass in presplitting method of surface mining

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International Journal of Mining Science and Technology 2014年第6期24卷 871-881页

作者： Sharafisafa Mansour aliabadian zeinab Alizadeh Rezvan Mortazavi Ali Department of Mining Metallurgy and Petroleum Engineering Amirkabir University of Technology Department of Mining Engineering Sahand University of Technology

Controlled blasting techniques are used to control overbreak and to aid in the stability of the remaining rock formation. Presplitting is one of the most common methods which is used in many open pit mining and surface blast design. The purpose of presplitting is to form a fracture plane across which the radial cracks from the production blast cannot travel. The purpose of this study is to investigate of effect of presplitting on the generation of a smooth wall in continuum and jointed rock mass. The 2D distinct element code was used to simulate the presplitting in a rock slope. The blast load history as a function of time was applied to the inner wall of each blasthole. Important parameters that were considered in the analysis were stress tensor and fracturing pattern. The blast loading magnitude and blasthole spacing and jointing pattern were found to be very significant in the final results.

关键词： Controlled blasting Presplitting method Continuum and jointed rock mass Distinct element modelling

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Simulation of Dynamic Fracturing of Continuum Rock in Open Pit Mining

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Geomaterials 2013年第3期3卷 82-89页

作者： zeinab aliabadian Mansour Sharafisafa Mohammad Nazemi Department of Mining and Metallurgical Engineering Amirkabir University of Technology Tehran Iran Faculty of Civil Engineering University of Newcastle Newcastle Australia

To investigate the dynamic fracture mechanism related to blast-induced borehole breakdown and crack propagation, 2D distinct element commercial code was used. The dynamic stresses, material status and velocity vectors are plotted and shown to evaluate rock mass failure under blast load. This paper focuses on the propagation and dynamic effects of blast waves in continuum rock masses. In order to investigate the effect of high strain rate loading on rock mass failure, a numerical simulation was conducted. The 2D distinct element code was used to model blast load effect on rock failure and stress distribution through the rock mass due to blast wave propagation. The blast loading history was simplified and applied to the blasthole walls. Accordingly, the interaction of explosive energy transferred to the rock mass from the blasthole pressure was examined as a function of time. A Mohr-Coulomb material model was used for host rock to allow for plastic failure calculations. The conducted numerical study describes the role of dynamic stresses in blasting in a qualitative manner. On the other hand, a free face boundary was considered as a common blast operation which is conducted in surface mining.

关键词： Numerical Modeling Blast Wave Fracture Propagation Surface Blast

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