Analysis of the observations and suggested method of excavation it can be seen from table 1 that the nonel detonators could not detonate even upto a temperature of 80oc. This reference may be obtained free of charge in adobe acrobat pdf format through the fhwa at the following. Bla st des igner software blades calculates blast plan parameters, explosives charge distribution, initiation timing and sequence, results in terms of rock breakage and fragment size distribution. A suitable application is ring blasting underground. 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 underground. Electronic detonators vs non electronic detonators and new. Orica is the global leader in commercial explosives and blasting systems, delivering solutions to meet our customers needs across the surface and underground mining, civil tunnelling, quarrying, construction and oil and gas markets. However, the general relations between the main blasting parameters. However, secondary blasting is the most expensive type of blasting. The third part of the dvd covers development drilling and blasting practices. Nonel was invented by the swedish company nitro nobel in the 1960s and 1970s, 1 under the leadership of peranders persson, 2 and launched to the. The design of nonel detonators incorporates patented technology, including the cushion disk cd and delay ignition buffer dib to provide reliability and accuracy in all blasting applications.
It will reliably initiate instant or delay nonel blasting caps. Throughout the blast design process, two overriding prin. Nonel is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and quarries. Appropriate blast design is important in order to lessen the production of over size. Our blasting professionals utilise a complete range of design, modelling, measurement and survey tools, a broad range of market leading products, as well as sophisticated delivery systems, to meet the wideranging needs of our customers. Blast hole diameter d in mm15 burden b 25 to 40 x d spacing s 1. Nonel ms is conventionally designed with 25 ms delay between the period. Study on blending of wall material of the nonel tube by csw. The perimeter blasting technique used depends on the rock type. Benches may be designed and carried forth with more. Orica offers a comprehensive range of industry leading blasting services to improve blast outcomes. The evolution of the detonator unbuilding the grace and.
Comparison of excavation damage zones resulting from blasting with nonel. Blast design generates blast plan and according to the delay pattern structure, simulation. Blasting machines 08 hb 10 blasting machine 08 nonel starter thumper 08 orica cd40 blasting machine 08 reo exploder cd2252j 35 shots blasting switch 09 blasting switch complete 09 blasting switch repair kit borehole plugs 10 plugs connecting wire 11 connecting wire loading 12 penberthy anoloder 14 bex model p loader. Nonel is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in. Blast design software blasting pattern software blast.
Thus, it is essential to consider rock fragmentation in blast design, the optimum blasting pattern to excavate a quarry efficiently and economically can be determined based on the maximum production cost which is generally estimated based on the rock fragmentation. The detonation method of the nonel tube was observed under highspeed cameras 3, 4, and the design and connection method of the blasting network was widely studied and applied 58. Introduction to sandblasting 4 sandblasting shading by harish dewani multistage blasting is when a strong contrast is created by removing part of the stencil and blasting long enough to cut deeply into the glass then removing the rest of the stencil to surface etch the rest of the design. A new perimeter control blast design concept for underground. They can also be used in combination with nonel ms, nonel eztl andor nonel td detonators to satisfy complex blast design requirements and minimize inventory of initiation system components. Techniques of controlled blasting linkedin slideshare.
Shaped charges are sometime used in secondary blasting, but this is much more expensive. Their characteristics, components, accessories and application. Nonel can be initiated by detonating cord or by a blasting cap. In addition to an electronic detonators design and construction, ebiss have other builtin features that provide a further level of safety and security that may not be found in other systems. The whole blasting network can be triggered by electric spark, which avoids the requirement of electric network for initiating current 1, 2. Blasthole patterns and charge loads will therefore change appreciably with the rock properties encountered. Blast design figure 82 staggered pattern figure 83 sing figure 81 square or rectangular pattern. Nonel is a shock tube detonator designed to initiate explosions, generally for the purpose of demolition of buildings and for use in the blasting of rock in mines and. According to them, it is a cap containing 2 grams of mercury fulminatekclo3 mix old formulation or the equivalent modern base charge of 0. Chapter 11 specialized blasting techniques national park.
Improved blasting results through precise initiation diva portal. The nonel shot pattern guide is designed to assist the blaster with surface timing sequences. How the initiation systems and detonators are constructed. The commercial use of explosives uses electrical detonators or the capped fuse which is a length of safety fuse to which an ordinary detonator has been joined. Xie js 2010 test analysis on the broken rock zone of the surrounding rock blasting for railway doubleline tunnel. This paper out lines surface mine blasting research com pleted since the bureaus last technology transfer seminar on blasting in december 1980. Blasting is the process of breaking of bulk rock masses into loose forms, using explosive compounds. Optimization of blasting parameters in opencast mines. The evolution of the detonator history hazardous ignition overcome in 1863 with development of practical detonator by alfred nobel wooden plug of black powder inserted into larger charge of liquid nitroglycerine, enclosed in metal shell nobel experimented with design and eventually developed a mercury blasting cap in 1865. Kadkade design of drilling and blasting pattern 7 7 4. Blasting patterns free download as powerpoint presentation. Ebiss incorporate a logic component in the detonator design in the form of a microchip technology or asic application an.
At some point in blasting, the rock breakage may not only occur according to the blasting round design, but there may also be extra rock damage behind the excavation boundary. Nonel ms is mostly used in bench blasting above and under ground, in underwater blasting and sublevel stoping. It is not designed to illustrate the connection of surface delay. Blasting of weak, highly fissured ground requires a more conservative design than blasting in tough massive rock. For underground metalnonmetal drifting applications stephen r. Study on blending of wall material of the nonel tube by. Prior to commencing any blasting work, the general contractor will submit to tdine a blast design document. Johnson office of mine safety and health research national institute for occupational safety and health abstract this report presents a new concept in. Nonel, booster, blast hole drilling, mine pnr mines, anfo, detonators introduction. Along the proposed project route, topography ranges from 586 to 3,741 f eet above mea n sea level a msl and crosses over. Not only do these provide evidence of the quality of his work, but they also.
Detonators can be chemically, mechanically, or electrically initiated, the latter two being the most common. Thus, for a blaster, valuable tool is the file of blast reports that he builds as he gains experience. Two of the benches were blasted with pyrotechnic nonel caps and were used as. Comparison of excavation damage zones resulting from. This manual was designed to provide a systematic approach to surface blast design. The overall number of shotholes reduced when blasting the same size of rock mass. Blast design introduction this chapter is an introduction to blasting techniques based primarily on the explosives and blasting procedures manual dick et al. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. Following are the techniques of controlled blasting.
However, safety and environmental constraints associated with the blasting process usually limit the extent to which blast energy or powder factor can be increased. Dyno nobel has endeavored to make the information in this manual accurate and educational, but makes no guarantee or warranty of the accuracy or complete ness of the matters addressed herein. The central hole is designed to be detonated by highexplosive detonating cord. The jksimblast design modules have a variety of tools to create hole layouts, insert decks of explosives and stemming, insert downhole delays and connect holes and points nodes with surface delays. This module presents recommended blast design practices for surfacemine and quarry blasting. Rock blasting and control overbreak fhwa us department of. Nonel ms is a nonelectric blast initiation system that can be used wherever millisecond delay detonators are required. This can be on the surface, underground or under water. Chapter 10 general blasting pdf blasting mats sequential blasting destruction of explosives nondeteriorated product disposing of deteriorated or damaged explosives ground vibration and air blast blasting vibration and air blast general safety in blasting practices chapter 11 specialized blasting techniques pdf avalanche blasting. Advantages and disadvantages of the different systems.
Development of a blast optimization model selection of proper explosive in any blasting round is an important aspect of optimum blast design. Information technology solutions a blast design consists of three components. Comparison of excavation damage zones resulting from blasting with nonel detonators and blasting with electronic detonators. Nonel ez det units can be easily connected to one another to satisfy basic blast design requirements in construction, mining, and quarry operations. Jun 14, 2018 however, the general relations between the main blasting parameters. Based on desired blasting inputs such as face coordinates, hole diameter, pattern layout, face rock characteristics and location, face profile, hole diameter, pattern layout, desired fragmentation size, explosives and initiating devices, environmental constraints, blast designer software blades calculates blast plan parameters, explosives charge distribution, initiation timing and sequence. Non electronic detonators and new blasthole loading techniques you decide author. Nonel initiation for ecofriendly blasting john gladious j 1, janarthanan r. Design of drilling and blasting pattern for excavation of.
Changes to blast design following the introduction of the memu truck the size of the shothole diameter increased from 95mm to 110mm. However, it detonated when it received blazing fire. General blasting plan 3 geologic setting the proposed project route begins in wetzel county, west virginia, and proceeds in a southeasterly direction through eleven 11 west virginia counties and six 6 virginia counties. Here, the primary role is played by the explosives. Total explosives in the blastvolume of rock blasted for. Secondary blasting can be done by pop shooting blockholing and plaster shooting mudcapping. Ebw exploding bridgewire exploding bridgewire detonators do not contain any primary explosive and are not detonated by stray currents, static electricity, radio transmission, or fire. Underground drilling and blasting training dvd acg youtube.
Oct 12, 2012 however, the general relations between the main blasting parameters. The blasting agent definition caught my eye immediately, because it inadvertently defines batfs concept of a number 8 test blasting cap. Line drilling, trim cushion blasting, smooth contour or perimeter blasting, presplitting, selecting and employing various parameters of blast design, using modern technology, precise and accurate timing delays, muffle blasting at critical and congested areas. At orica, were committed to developing tomorrows technologies and solving todays challenges together with our customers. These rules provide a first estimate in the absence of any better data. A detonator, frequently a blasting cap, is a device used to trigger an explosive device. Instead of electric wires, a hollow plastic tube delivers the firing impulse to the detonator, making it immune to most of the hazards associated with stray electric current. Because of widely varying properties of rock, geologic structure. Presplit blasting spacing hole diameter x 12 burden 0. Clearing the toe, and therefore contributing to a smoother floor, is a major asset to improve blast design.