It is easily operated by contractors, excavators, field workers, and more to efficiently remove boulders, concrete structures, and rock formations. Kuznetsov 1973 suggested the following empirical equation to predict the mean fragmentation size resulting from rock blasting. Having the capacity to determine the expected rock size after blasting based on. To summarize, the key aspects of blasting are the release of the appropriate charges at the right time in order to obtain the good break mechanisms.
Much of the information in the module is derived from the surface mining control and reclamation act of 1977 smcra. Drilling and blasting software, drill and blast, spreadsheets. These properties are important factors in rock blasting. Numerical simulations of rock blasting damage based on laboratory. In closely jointed rock, fine fragmentation is achieved easily, and muck pile looseness often becomes the main aim of blasting. Softblast is the australasian distributor of splitdesktop software for fragmentation size determination. Ezebreak llc microblaster cracking rock and concrete. Optimized design of drilling and blasting operations in open. Abrasive grit blasting, also known as sandblasting, is a surface treatment process whereby abrasive particles are fired through a nozzle using compressed air. Drilling and blasting of rocks represent very complex.
Pdf nowadays, software is increasingly used in mining through the exploitation of. The use of vent holes or vent pits may also be necessary. The main inputs to the model are the insitu block size f80, the postblast fragmentation p80 and. Pdf application of softwares for drilling and blasting researchgate. Particles range from walnut shells relatively soft, through various. The three main factors affecting the blast results, depends on explosive selection and its quality, blast design and the procedures implemented to replicate this design. Tensile and compressive strength most types of rock have a compressive strength which is 8 to 10 times greater than the tensile strength.
Blaster product line, a suite of patented rock breaking equipment that is powerful, portable, lightweight, and affordable. The angle between weakness planes and blast direction is given by the angle blast direction is defined to be perpendicular to the bench wall face. Lecture 9 introduction to rock strength david hart. Jan 05, 2019 in the mining world, rock blasting is one of the main procedures of ore winning process hustrulid, 1999. University of rizona mining and geological engineering. We provide an allinclusive drill and blast software system, called dbs, to help you achieve efficient and effective drill and blast operations with an environmentally responsible quality outcome. Figure 84 typical bench cut with two free faces and fired with one delay per row. This research worked therefore correlates between the blasting geometry and uniaxial compressive strength of different types of rock with a few to finding a blasting solution to achieved. The angle between weakness planes and blast direction is given by the angle.
The more important characteristics of the rock influencing the blasting result include. The selection of a blast hole diameter depends on the type of work and the desired fragmentation of the rock. After blasting an insitu rock, most blast engineers always use the same. Software solution for better rock drilling blasting design, planning and analysis. Grit blasting is widely used in a variety of industries to clean or modify the surface properties of components. Analysis of blasted rocks fragmentation using digital image. The objective of this toolbox training on flyrock awareness is to improve blast safety by providing information about blasting to those who work around blast sites. Controlling the adverse effects of blasting this module addresses the control of offsite impacts that result from blasting, namely. Site specific blasting model for minetomill optimization. The compressive strength of rock is a function of the confining pressure. Figure 85 indicates that the direction of throw of the blasted rock can be controlled by varying the delay pattern. This article explains how to use gunpowder, cannon fuse, and modeling clay to blast, break, or demolish stone. Although it has been already pointed out that the size of fragmented rock depends on the blasting standard and mechanical properties of rock 6, it can be seen from this figure that the data vary widely and no obvious correlation can be recognized.
Rock properties mining engineer first class mine manager. Having the capacity to determine the expected rock size after blasting based on design parameters provides a strong basis for future designs. Its important to understand the rock characteristics, structures and behaviour when submitted to a certain kind of stress generated by explosives bhandari, 1997. Schmidt hammer was used for in situ determination of rock hardness. Lower your drill and blast costs, manage your drilling consumables, explosive consumables and suppliers. Paper open access correlation between uniaxial compressive. In this research, the split desktop image analysis software was used to.
Anisotropy of the rock gives directional dependent rock strength and directional dependent blasting effects. A model to calculate blasting costs using hole diameter, uniaxial. Feb, 2018 how to blast, or break rock with blasting powder, gun powder. Softblast and its agents can also provide technical support and training. Fragmentation is the ultimate measure of efficiency of any production blasting operations. Site of study is a limestone quarry producing limestone for cement manufacturing. Datavis has created drill and blast software dbs a complete system to achieve efficiency of drill and blast operations.
Surfacemine blasting technology has advanced at a steady pace, and improvements such as electronic blasting systems with vastly expanded delaytiming ranges and detonation capacities, new explosive products and userfriendly blastdesign software offer increasingly hightech means to improve blast effectiveness. Planned fragmentation is affected by blasthole burden, spacing, explosive strength, geologic factors and blasthole diameter. When designing blasting operation, rock characteristics such as strength and presence of discontinuity should also be accounted for, as they will govern the amount of energy required to break the rock. Blasting cost, hole diameter, uniaxial compressive strength, joint set. Velocity of detonation measurement and fragmentation analysis. Blasting data were collected from the study areas for optimization. The information can be used for boulder removal, mining. Measurement of size distribution of blasted rock using. Flyrock is a potential hazard anytime and anywhere there is blasting.
Effects of rock mass conditions and blasting standard on. The following is a simple guide for estimating a suitable drilling pattern for bench blasting. As the confining pressure increases so does the strength. The use of explosives, to break and fragment rock, is the fastest and efficient procedure to make it transportable has become a worldwide used technique. The rock will move forward normally to the rows of holes. In the illustration that follows figure 84 shows a typical bench cut with two free faces and fired with one delay per row.
A sitespecific blasting model has been developed for the asarco mission mine. Outputs obtained from the software were also compared to results of the kuzram experimental model. Abrasive blasting is the general term applied to finishing processes that entail the highpressure propulsion of a stream of abrasive material onto the surface of a workpiece. Blastatistics software for quality control of drilling and blasting in opencut mines. Jun 14, 2018 anisotropy of the rock gives directional dependent rock strength and directional dependent blasting effects. The blasting effects can be measured by analyzing the stress scope in the mises stress nephogram, as well as the mises stress density in the blasting area and. In numerical blasting simulations, the mises stress is generally used to describe the complex stress variations during rock blasting and to characterize the blasting effects on the rock. Optimization of blasting parameters using regression models. Blast direction is defined to be perpendicular to the bench wall face.
Influence of rock strength on the propagation of slotted. And wherever accurate drilling, blasting and design are needed, isure software and iseries drilling rigs make all the difference. The relative weight strength of the explosive to anfo %. While previous research has focused on optimizing these operations as two separate parts or merely in a specific parameter, this paper proposes a system dynamic model sdm for drilling and blasting operations as an interactive system. Cdc mining toolbox training on flyrock awareness niosh. For the most versatile and powerful blasting design solution. Rock excavation is the first process in the cycle of operation of a mine, and efficient blasting is key to the profitability of the mine. It includes the different variables that affect the blasting result. Uniaxial compressive strength of in situ rock was estimated from the values obtained from schmidt hammer rebound hardness test and density determined from laboratory test. Whether you are a mining engineer designing blasts everyday, a manager looking for a better control of blasting operation or a blaster starting out learning how to improve blast design, dnablast software has the right tools for you.
Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages. Dec 30, 2011 the more important characteristics of the rock influencing the blasting result include. Blasting is the most efficient way of drilling for extraction of hard rocks. Rock properties, explosive properties, and design variables are combined using five underlying equations in this modern version of the kuzram fragmentation model. Abrasive blasting can serve many surface finishing purposes, such as removing contaminants or previous coatings, altering the shape and smoothing or roughening the surface. How to blast, or break rock with blasting powder, gun powder. It may fail catastrophically if the load frame is soft. Rock properties affect many aspects of the mining operation. Modification of blasting procedures should include limiting the size and frequency of blasts to limit the production of noxious fumes, and stripping of the overburden prior to blasting and excavating the shot rock immediately after blasting to allow the venting of gases.
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