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In this work, is being described the developing of the study for the demolition by controlled blasting project of a building of reinforced concrete, in the center of a spanish city. Synthetically, it is being analyzed the timing of the fall of the parts of the structure. This documentation is completed with a group of four photographs of the falling sequence and a film about several demolitions and the particular one described in this paper.

Jan 1, 1977

By Thomas C. Jones

The purpose of this paper is to disseminate new information for nonelectric blasting in trenching and construction work. The presentation is not designed or intended to discredit conventional electric detonators or use of MS connectors and cord. Its sole purpose is to inform the S.E.E. of new and exciting benefits realized by the use of the Hercudet non-electric system in the construction industry.

Jan 1, 1984

By Carl Hendricks

AQUILA Mining Systems Ltd. is the world leader in drill monitoring, control and GPS based drill navigation systems for the mining industry. This paper will review the general design and application of AQUILA.s drill systems currently in use throughout the world and the key benefits that derive through their use.

Jan 1, 2002

By Don Thompson

The Minntac Mine drills and blasts approximately 75 million long tons of taconite per year. This requires drilling one million feet of 1 6-inch diameter holes. We are in the process of replacing our old generation rotary blasthole drills (Gardner-Denver 120's and Bucyrus-Erie 61R's) with new generation rotary blasthole drills (Bucyrus-Erie 59R's and P&H 120A's).

Jan 1, 1998

By Albert van Niekerk, Mick Lownds

Overview of the UNI Tronic™ Electronic Blasting System

Jan 1, 2004

By William H. Snyer, Victor A. Sterner

A cache of buried explosives was discovered by ICI Explosives, USA Inc. at one of their sites near Gillette, Wyoming. An intensive investigation conducted by ICI management indicated that nitroglycerin sensitized dynamite might be present. Information also indicated that up to 20,000 pounds of explosives may have been buried.

Jan 1, 1997

By Donald J. Westmaas, Fred C. Drury

The factors affecting the selection and use of exploisves have changed radically in the past three decades. The objective of this paper is to point out considerations which should now be employed by the Explosives Engineer in his selection and use of modern chemical explosives.

Jan 1, 1978

By Rick Lamkie

When investigating citizen complaints about blast vibration and airblast, it is important to be able to establish the spatial relationships between blasts, blasting seismographs monitoring the events, and complainant structures to assess any directional impacts. The Pennsylvania Department of Environmental Protection (DEP) routinely uses hand-held GPS receivers to document these relationships. The waypoint (structures and seismograph monitoring locations) and tracking (blasting and permit areas) features are used to map a site. These data are imported into the software for editing and conversion to GPS Exchange (.gpx) format.

Jan 1, 2008

By K. Hausmann, W. Whelchel

The properties of ethylene Ionomer resins for the inner layer of non-electric shock tubes will be discussed in detail, and opportunities for property enhancement will be pointed out. A stiffness program for prediction of shock tube stiffness, as determined by the stiffness of the individual layers, will be presented and discussed.

Jan 1, 2010

By E. Contestabile, B. von Rosen

On August 5th, 1998, a tractor-trailer carrying approximately 18,000 kg of blasting explosives, struck a rock face on the side of the road near the town of Walden, Ontario. Eye-witness accounts of the incident state that there was an intense fire for approximately 30 minutes before the detonation. The detonation caused severe damage to the tractor-trailer, shifted the pavement and caused blast damage to the rock face. A rock fragment was recovered almost 2.5 km from ground zero and a 70 kg piece of an axle assembly was recovered over 1 km from the site. Windows were cracked at distances of almost 3 km.

Jan 1, 2001

By Roger Lucas, Dale Nies

The McLaughlin Mine is an open-pit disseminated gold mining operation. Homestake Mining Company's approach to solving some of the blasting problems inherent to this type of deposit provide an interesting case history. Geology, although unique and site specific, is overall similar to other mines within the Western United States over-thrust belt and demonstrates an excellent example of the blasting conditions and requirements common to most of these operations.

Jan 1, 1990

By Edward J. Walter

Vibration control is affected by many factors which are difficult to isolate and evaluate. Occasionally a circumstance occurs in which one factor appears to predominate and its effects can be evaluated. Changing rock characteristic or lithologic variation is one of these factors or parameters. In a recent seismic monitoring project, lithologic variation in the form of hard lenses occurring suddenly and randomly in the rock to be excavated caused sudden and large increases in vibration level. Data are presented to illustrate these effects, and procedures used to control these effects are described.

Jan 1, 1981

By Stephen Chung, John Carpenter, Scott Gosch, James Breedlove

While controlling fly rock and ground vibration in quarrying in the neighborhood of a residential area, producing good fragmentation and keeping different grades of material separated in a muckpile are important in maintaining the productivity of quality aggregates. This paper describes a single row production blast for the study of fragmentation and displacement in the grade control carried out at a quarry of Barrett Paving Materials Inc. in Sylvania, Ohio. Digital video imaging was used to monitor the blast-induced motion of the bench face as input to the DMC_Blast (Distinct Motion Code), for the analysis of the formation of the muckpile. The actual digitized blast video and the DMC_Blast simulation are compared. The displacement and mixing of all the inter-bedded limestone layers are made visible in the simulated cross-section of the muckpile. The apparent fragmentation analysed with PowerSieve is also discussed.

Jan 1, 2001

By Minoru Kawamora, Koichi Kurokawa, Kenji Hashimoto

We developed concentrated remote control blasting system to blasting simultaneously at a large number of sites in a mine of large scale. This system is consisted of three parts, the first part is a control station with high voltage power source units, the second part is a relay terminal with relaying and branching units, and the third part is a blasting machine with charging and discharging units. The control station is connected with the blasting machine by mean of control bus wire. The blasting machine adopts MBS(electromagnetic induction blasting system) for the reason of safety and good handling.

Jan 1, 1990

By Fumihiko Sumiya, Kunihisa Katsuyama, Yuji Ogata, Yukio Kato, Yuji Wada, Yoshikazu Hirosaki

Smooth blasting technique is widely applied for tunneling road or railway construction in Japan. However, smooth blasting technique often causes problem related to detonation failure in explosive column due to channel effect. Channel effect is attributed to the precursor air shock wave (PAS), which propagates ahead of detonation front in an air channel of borehole. PAS precompresses and desensitizes the unreacted explosive column. The failure of detonation propagation occurs as a result. It was concluded in our previous work that reducing PAS velocity was one of the effective methods for the prevention of channel effect.

Jan 1, 2003

By Stephen P. Case, Stephen Castellucci, William Parsons

In this paper, the authors present a step-by-step discussion of dimension stone production at a New England granite quarry. The quarry mines a rare pink granite which is used for facings and panels in the construction of high rise buildings around the world. The discussion includes geological considerations, block layout, drilling, explosives loading, block handling, and mobile equipment utilization.

Jan 1, 1990

By E. Contestabile, B von Roser

Schedule IV containers in Canada and IME- containers in the United States have made possible the transport of mixed loads. That is, using these containers for detonators, one can simultaneously transport detonators and explosives on the same vehicle. As a result of a recent accident, the Canadian Chief Inspector of Explosives asked for a review of the appropriateness of the Schedule IV container in its present use. The Canadian Authority asked for a re-assessment of the adequacy of the Schedule IV container in preventing propagation of a reaction from the detonators in the container to the remainder of the explosives on the truck, and its ability to contain fragments generated by the detonators. A series of tests was performed to determine the initiation threshold temperature for non-electric detonators and the failure threshold temperature for the shock tube to establish some guidelines for preventing communication from one case of detonators to another within the transport container at elevated temperature. Tests fell into the following categories: inter-case sympathetic detonation, detonator thermal auto-initiation, shock tube thermal sensitivity, and intra-case sympathetic detonation. The results indicate that temperature is a critical factor, which determines to what extent, if any, communication occurs.

Jan 1, 2002

By Pierre-Alexandre Abeel, Charles Dowding, Justin Lueker

When blasting is eliminated as a cause of cosmetic cracking, often someone will ask, “If blasting didn’t cause the crack, then what did?” This paper describes detection by remotely operated instrumentation of the new cosmetic crack that was climatologically-induced. The measurement was obtained as a part of the development of Autonomous Crack Measurement (ACM) instruments to measure micro-inch response of cracks to both long-term, climatological, and dynamic, blast vibration effects. The crack occurred in the wall of a structure that was monitored for over 29 months and as such represents one of the longest periods of ACM observation.

Jan 1, 2015

By Richard A. Dick

Few topics in the blasting industry are more controversial than the proper riming procedure for large-diameter ammonium nitrate-fuel oil (AN-FO) charges, despite the considerable amount of research that has been done both in the laboratory and in the field. The January, April, and June 1975 issues of Emphasis on Blasting contain interesting discussions on priming (5). An ideal primer is one that will surely and efficiently initiate the AN-FO column at the correct location to assure optimum blasting performance. During the 20 years of AN-FO's existence, singlepoint priming, axial priming, multiple-point priming, thermal priming, and shock riming have all been advocated as the "optimum" method. This is not surprising because blasting specialists have often differed on even the most fundamental concepts. To define the optimum primer, we must know what detonation characteristics in the AN-FO column are most desirable. Again, authorities disagree. This paper will discuss conclusions of various studies in an attempt to clear up some of the confusion.

Jan 1, 1976

By K Lombardo

Numerous small- and intermediate-size cratering experiments have been conducted in Piceance Creek Basin oil shale at the Colony and Anvil Points oil shale mines near Rifle, Colorado. The purpose of these experiments was to evaluate scaling as a tool to infer the behavior of large-scale tests from small-scale experiments, to calibrate the hydrodynamic computer codes used to model explosive fragmentation of oil shale, and to investigate the influence of bedding plane orientation, natural joints, fractures, and the grade of oil shale on rock fragmentation.

Jan 1, 1983