Josh lachapelle, the electronic initiation representative, used viewshot, dyno nobels blast pattern software, to input the timing and tie in path for accuracy and potential troubleshooting. Throughout the blast design process, two overriding prin ciples must be kept in. Johnson office of mine safety and health research national institute for occupational safety and health abstract this report presents a new concept in perimeter control blasting for. Ring blasting is a common production method in underground metal mines. February 26, 2018 section page 5 description the american safe room shelter system is comprised of a series of individual kits that can be supplied together to build a complete shelter or separately for use in your own shelter design. There are two problems that caused unoptimum blasting result parameters for the iii class of development rock mass in the underground gold mine pt. Guidelines for the design of buried steel pipe july 2001. Underground blast designer for stope blasting youtube. These approaches however, have applied empirical relations that do not adequately consider ring blasting geometries. The dynamic behavior of module under blast load is studied in finite element software abaqus 6.
Misfires misfires happen when a loaded hole, portion of a loaded hole, or several loaded holes fail to detonate during a blast. Underground blast rounds are divided into two basic. A vertical rock surface in an underground mining operation. Initial effects of improved drill and blast practices on.
Oricas shotplusug and shotplust software enables optimum blast design and analysis for underground operations. Pdf this chapter focuses on the blasting in sublevel caving. A new perimeter control blast design concept for underground metalnonmetal drifting applications stephen r. These systems can be interfaced with existing blast management software. When underground blasting operations are close to occupied or otherwise sensitive structures, the level of ground vibration and noise. The university of queensland bachelor of engineering thesis. Blasts may have to be redesigned or rescheduled for more favorable atmospheric conditions to minimize air waves. The design principals used to develop this kit include economy of price and labor as well as the human nature element that has been documented when civil social order breaks down. Assessment and optimisation of winze blasting designs for underground. Vulcan stope optimiser pdf individual designs take into account stope geometry along with geological and geotechnical restraints. Buffer hole radial damage is defined by a practical damage limit applied to the rock lying between the buffer holes and the perimeter.
International journal of civil engineering and technology, 83, 2017, pp. Blast design introduction this chapter is an introduction to blasting techniques based primarily on the explosives and blasting procedures manual dick et al. Since 2003, the experts at iring have been solely dedicated to the pursuit of optimizing underground drilling and blasting operations. Pdf a fragmentation model for underground production.
Blasthole are drilled at an angle to the face in a uniform wedge. Creators of aegis underground ring design software. Its often the case where operators skimp on the blast design to save money. The university of queensland bachelor of engineering. It produces all the data you need for an optimized drilling. A new perimeter control blast design concept for underground.
Pdf a fragmentation model for underground production blasting. This type of blast design is typically used for expanding a previously excavated drift to accommodate more space or to correct a poor blast. Depth of advance underground blasting is the total length of the borehole that broke from the. Benches may be designed and carried forth with more. Ring blasting design modeling and optimization blastconsult. Specific round designs a round is simply one fragmentation or blast sequence. Calculation of blast loads for application to structural.
Blast plan preparation, including mining operations guide. Blast overbreak dilution related to blasting parameters such as blast design, drill hole deviation and quality control have been termed blast overbreak. Many contractors opt to cover the blast with soil, sand or other fine material. Burn cut a type of opening cut blast design that utilizes one or more empty relief holes to give relief to the rounds charged holes. To calculate burdens b and charges for the different parts of the round the following graph may be used as a basis.
Assessment and optimisation of winze blasting designs. The new blast design concept applies the understanding of radial damage that is caused by the buffer hole column charge. To minimize damage to the rock a prerock, a presplit blast surface excavation or smoothwall blast underground may be used to create the final excavation surface. The blasting technology and its rational parameters of blast hole blasting in preparatory development operations using the recommended ampoule technology of dispersed column charge were tried in different mining geological conditions in the irtysh, belousov, mirgalimsay, aksay and shalkiin fields. The apex angle is as near as possible to 600 figure 1 this type of cut is particularly suited to large size drifts, which have well laminated or fissured rocks. Strategies for minimising and predicting dilution in. The material presented has been collected from various sources and. If so, when new blast occurs, the fragments from the new blast will collide with the muck pile left from the. La11097ms, controlled blasting and its implications. Design principles for shaft, tunnel, and raise rounds are.
Design recommendation for sloshing phenomena in tanks has been added in this publication. Timecurrent coordination for all new overcurrent protective devices and existing devices where connections are made as part of the project is to be performed after the design. Set blast timing for holes in various patterns and sequences and animate the resultant blast. Figure 87 analysis of efficient blast design efficient blast designs combined with the proper choice of explosive can produce better fragmentation with associated lower operating costs compared to blast designs and explosives used under adverse conditions. This mineral research centre jkmrc approach paper focuses on the design and analysis process 2 general approach to blast design mining technology 2007 vol 116 no 4 181 onederra and chitombo design methodology for underground ring blasting highlighted in the figure. Therefore, every mines, whether underground or opencast surface mines, drilling blasting activities are one of most important. This research focuses on an alternative section of cylindrical module of the shelter. Orica launches underground blast design software to boost. Nalini, analysis and design of the underground structure to resist blast loads from conventional weapons. American safe room s underground blast resistant bombfallout.
Understand the parameters that must be considered to ensure the most practical and effective design can be achieved. Potvins 1988 study of large open stoping indicated that in. With this understanding, parts of the following guidelines are offered as independent modules that can be applied in part or in whole. As a drill and blast process, it presents particular features that do not correspond with bench blasting in open pit or underground mining. This blast pattern is a variant of the fan cut but all of the holes are angled along the length of the wall that is to be excavated. What we have discovered is that when we turn the blast into a repeatable industrial process then the overall costs and environmental impact are reduced substantially, at the same time allowing for increased rates of production. Strategies for minimising and predicting dilution in narrow. In this paper, a six month minetomill optimization program performed in a cupbzn underground.
It covers the criteria for safety of such struc tures from cracking and also specifies the effective accelerations for their design in certain cases. The next generation in underground blasting software aegis is the ultimate solution for providing interactive and automated underground drill and blast design. Vulcan underground drill and blast fast, accurate and flexible blast pattern design. Therefore, they are generally shallow blasts along a length of a wall. The blast design components, breakage magnitudes, ppv levels and advance rates were monitored in development blast at ehm from july 2015 january 2016 for analysing the mining accuracy, blast diagnostics or detonation performance and modelling. Blastop underground blast designer for stope blasting. Since 2003, the experts at iring have been solely dedicated to the pursuit of optimizing underground drilling and blasting. American safe room s underground blast resistant bomb. Furthermore, achieving optimal fragmentation distributions to.
When underground blasting operations are close to occupied or otherwise. Design changes were recommenced for those quarries where problems were occurring and where the calculations suggested a change. Introduction in both surface and underground mining operations there is a need for the use of special blasting techniques to improve highwall stability and reduce overbreak. Under this definition blast overbreak is quite literally breakage of the rock over the limits of the design. Contact us today to organize a personalized demonstration during which, using your data, we will show you how to optimize your mine performance with deswiks integrated solutions. Serious injuries and fatalities have occurred when a blast shoots through into an adjacent entry. In an underground coal mine in floyd county, ky, three miners were injured when a face blasted into an outby crosscut msha, 2003. Pull the depth to which an underground round breaks. Pdf selecting the optimal drilling and blasting design for. The mining accuracy analysis highlighted that the blast design presented multiple flaws and. Shotplus undergrounds advanced blast design and modelling technologies enable users to design, visualise and analyse complex blast initiation sequences. The american safe r oom blast r esistant bombf allout shelter s ystem facilitates a simple mechanism to construct a true steelreinforced concrete underground.
Blasting design heavily relies on personal experience due to the lack of design. The multifaceted system allows users to rapidly compare different scenarios and generate ring layouts, charging plans and blast designs to paper, or directly to compatible drill. Designs editable ring blast pattern for stope based on geological and geotechnical conditions of the stope. Hole depth, rock type, and distance to structure hole diameter d hole depth h divided by 5 to 10. There are two reasons to go underground and excavate. Controlled blast design in wet or dry conditions easy to use in any conditions the z bar lifter and edge are contour rigid tube explosives designed to deliver precision floor blasting and perimeter blasting in both wet and cartridge is responsible for thedry underground developments. There are three sections to the mining blast plan templates covering. The old linear design formulas for small hole blasting are not valid any longer. Pdf rock blasting in underground mining researchgate. Riibla205d store, handle and transport explosives riibla303d conduct underground development. Blast design, underground ring blasting, underground mining, underground production blasting, fragmentation, damage synopsis as with development or tunnel blasting, underground ring design requires an adequate understanding and description of the prevailing geotechnical and mining conditions.
Design spectra for sloshing, spectra for long period range in other words, damping ratios for the sloshing phenomena and pressures by the sloshing on the tank roof have been presented. Advanced underground blast design for complex blasting scenarios reduce the overall cost of drill and blast operations improve productivity improve safety facilitate regulatory compliance precision design and visualisation a full interactive 3d design environment, to view and edit blastholes from any angle and proximity blast timing. Blast design figure 82 staggered pattern figure 83 sing figure 81 square or rectangular pattern. Large tunnels are also used to build underground rail and roadways. Blast load, burster slab, conventional weapons, explosive devices cite this article. Blast design, includ ing geologic considerations, for both surface and underground blasting is detailed. Controlled fragmentation and contours in rock blasting diva. Pdf breakage and fragmentation modelling for underground. An analysis of burn cut pull optimization through varying.
Design and analysis of hpfrcc blast resistant structures. There is a cut blast, a slash blast, a perimeter blast, and a lifter blast. Apply the basic principles of underground drilling and blasting. Blasting mats are usually fabricated from sections of rubber tires, manila rope, used conveyor belting or other similar materials. Because of widely varying properties of rock, geologic structure. For this purpose, blast energy simulation allows identifying contours of fragmentation and rock breakage, to be calibrated against the real results obtained in the field. Pdf drilling and blasting operations are very important part of underground excavation design. In the current technical guide, an overview of a design procedure for structures under blast loading is provided. Effects of blast ring burden and explosive density on. Pdf design methodology for underground ring blasting. Blast geometry and design is imperative to create safe discharges and blast results required for mine operating parameters. Jan 21, 2020 shotplus underground is designed to meet the discrete needs of underground mining applications, delivering an improved interactive 3d environment and enhanced visualisation as well as quality assurancequality control qaqc tools to allow engineers to identify the most efficient blast design to ensure the required outcome. This course is designed to comply with national underground blasting competencies, regulations, codes and standards. However, theres increasing interest in optimising all blast requirements and objectives in the primary blast design.
Qgn 11 handling explosives in underground mines department of. Blast design, underground ring blasting, underground mining, underground production blasting. The eurocode en 199117 1 makes reference to the case of accidental loads and explosions, but it is mainly focused on impact actions, such as collisions from trucks, trains, ships, helicopters or any other vehicle. Figure 85, the rock mass would be thrown to the right during blasting. Blasthole loading of various explosive types is covered. Current controlled blast designs are based on closely spaced. The blast design was developed by the engineering group at the renard mine and was executed by the dyno nobel onsite representatives.
628 734 1425 794 1106 686 1340 71 1404 300 409 1376 1308 176 1711 1103 580 1664 1371 1142 1704 429 1157 1708 58 613 899 1576 1604 231 1219