A numerical description of the formation of a crater in rock blasting.

Abstract A newly developed damage model was used in the study of rock fragmentation mechanisms involved in crater blasting. Simulations show that at the detonation of the explosive charge, a crushed zone around the explosive charge is formed due to compressive failure and then a strong pressure wave is sent out forming a pressurized ring that propagates at the dilatation wave velocity. As the pressurized ring leaves the crushed zone, two tensile stress components perpendicular to the radial stress are developed in response to the action of the radial pressure, causing tensile failure and forming a damage zone around the charge. The formation of this damage zone is quite independent of the depth of the explosive charge provided there is no interference by the reflection from the free face. When the pressurized ring reaches the free face, it is reflected there and causes rock failure on the ground surface that forms another damage zone. Under the simulation conditions, it is revealed that the depth of charge is a factor controlling the relationship between the two damage zones. At a depth smaller than the
Keywords: Blasting, Rock fragmentation mechanisms, Simulations.
Full Access to Technical Paper
PDF version for $20.00
Search
Sort By:  Relevance
Showing results 1 - 3
Text
Summary: The ultimate aim of a mine design is to determine the development work involved and resources required by adopting one or more specific alternatives. A part of the process is the production of mining plans/designs, an outline of the amount of work and costs involved as well as a prediction of the revenues expected. The paper aims to examine these aspects of mine design using the computer models developed. These models are capable of designing and performing economic analysis for one or more...
Publication: CIM Bulletin
Author(s): R.R. Tatiya
Keywords: Mine design, Computer modeling, Economic analysis.
Issue: 1023
Volume: 91
Year: 1998
Text
Summary: The mine of the year 2020 will need to be based on a new way of mining. It will employ technology in a paradigm that assumes responsibility for sustainable development: taking account not only economic but also ecological and social issues. This will require a holistic approach to mine design and planning, considering all controlling factors and impacts (technical, economic, environmental and social). A national collaborative strategy is required to address the several options that exist for...
Publication: CIM Bulletin
Author(s): M. Scoble, L.K. Daneshmend
Keywords: Mining technology, Holistic design and planning, Human resources, Education.
Issue: 1023
Volume: 91
Year: 1998
Text
Summary: Due to the randomness of all factors influencing the sintering operation, a two-stepped procedure is proposed to find the best way of using stocked fines at a plant producing Fe-Mn alloys for the steelmaking industry. The approach is based on the following: (1) predict the result of the sintering operation by establishing the best multilinear regression model using some of the characteristics of the loaded material; and (2) find the best solution under a minimizing cost criteria by solving a...
Publication: CIM Bulletin
Author(s): M.F. Almeida
Keywords: Manganese ores, Modelling, Optimization, Regression, Sintering.
Issue: 1023
Volume: 91
Year: 1998
Powered by Coveo Enterprise Search