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By Jerry R. Wallace

A systematic, team approach to pre-blast and on-going problem solving contributed to the successful completion of this indoor industrial construction blasting project.

Jan 1, 1995

By Lawrence C. K Hu

The release of load mechanism during rock breakage by explosives was founded by Dr. T. N. Hagan & published at the Sixth International Colloquium on Gasdynamics of Explosions and Reactive Systems Stockholm, Sweden, 1977.

Jan 1, 1995

By Roger N. Prescott

The Bureau of Alcohol, Tobacco and Firearms (BATF) is sponsoring legislation requiring the addition of identification taggants to commercial explosives. These are plastic particles with color coded layers that theoretically can be used to identify the explosive by date shift code.

Jan 1, 1980

By Stephen A. Rholl

Computer software has been developed which uses fast Fourier Transform (FFT) techniques to analyze the frequency spectrum associated with peaks in ground vibration time histories. The procedure consists of filtering the FFT of a time history into individual frequency components.

Jan 1, 1996

By Alan R. Gadberry

Good mine planning is critical to the success of a safe, cost effective mine. Many factors contribute to the overall success of an open pit mining operation: proper pit location and development, good drilling and blasting practice, and well conceived short range and long range mining plans.

Jan 1, 1981

I am interested in experiences people have had with blasting near existing railroad tracks: What kind of vibration criteria are used, and how successful you have been in gaining approval for blasting in the vicinity of railroads. This would both be for passenger and freight railroads

Jan 1, 2008

By R Mancini

Explosive charge action on the medium is intrinsically dynamic (fast rising and fast vanishing). On the contrary, information available on rock strength is drawn from static behaviour, and it's commonly used to characterise the rock, even in blasting problems.

Jan 1, 1995

By Gungor Tuncer, Ali Kahriman

"In bench blast design, not only the technical and economical aspects, such as block size, uniformityand cost, but also the elimination of environmental problems resulting from ground vibration and airblast should be taken into consideration."

Jan 1, 1999

By Larry R. Fletcher

Excessive flyrock, which is blasted rock that travels beyond the secured blast area, is responsible for 25 pct of the blasting injuries that occur in surface mining. Excessive flyrock is also a frequent cause of damage to mine equipment and facilities.

Jan 1, 1986

By Michael David Wilkins, Paul N. Worsey

Little research has been published on stemming blast holes, particularly what happens during the process. Previous work has concentrated on the performance of the inert material to find the best way to seal the hole and retain the explosive energy, at the exclusion of determining what happens during the loading and stemming process.

Jan 1, 1998

By C H. Dowding, P W. Linehan

Many of the technical and non-technical or human problems associated with blasting can be minimized through a proper preconstruction test-blast program.

Jan 1, 1986

By T S. Bajpayee, Thomas C. Ruhe

"The Pittsburgh Research Laboratory of NIOSH conducted research to determine the safe operatingconditions for using recycled (used) lubricating oil from mining equipment as a partial replacement for diesel fuel to make ANFO-type blasting agents. The use of recycled oil (RO) conserves energy, reduces oil imports, and reduces mining costs."

Jan 1, 1999

By Thomas M. Keevin, Gregory L. Hempen

Accurate assessment of blasting near an object (organism or structure) requires recording of the damage parameter for low-valued scaled distances. Seismograph recordings of particle velocity are a well established, common procedure for land-based blasting. Similarly, pressure recording of the absolute waveform needs to be a more common procedure for sensitive, underwater resources.

Jan 1, 1997

Vibration resulting from blasting has been a source of concern from the inception of the use of explosives. As a result many investigations have been made concerning the seismic effects of blasting and at present there is available an adequate set of standards with which to judge seismically the damage capability of a blasting operation.

Jan 1, 1976

By Liu Hui Yang Nianhua Feng Shuyu

The paper analyzed the dynamic stress in the rock around the tunnel and the effect on the stress variation for the different blasting parameters. Also, the paper verified the theoretical results by dynamic photoelastical tests and provided helpful reference for the design of blasting near a tunnel.

Jan 1, 1998

By Yu Yalun, Meng Chuyan, Wang Lin, Wang Deshang

Based on the analysis of problems with wall control blasts in open pits, the essential theoretical basis and technological design of the damping presplit blasts are put forward. After practical application of this method in Nanfen Open Pit China, very good results have been achieved: 1) The rate of decreased vibration is up to 40%; and 2) The damage area of slope is reduced about 60%.

Jan 1, 1998

By William C. Pearson

In past years, the usual justification for underground mining of limestone has been the depth of the overburden, perhaps 100 feet thick or more. At our Okolona Quarry in suburban Louisville, Kentucky, the overburden is usually shallow -- it averages 8 to 10 feet in thickness. However, in July 1980, we began development of an underground limestone mine on that property which also includes surface mining operations.

Jan 1, 1983

By R DeLon Hunsaker

In the past, quarrying and other small operations have not been able to take advantage of the lower cost, convenience and better performance of bulk slurries. However, with the introduction of repumpable emulsion slurries and their ability to be stored in containers as blasting agents, bulk slurries are now available for small operations with small diameter boreholes and are producing excellent results. This same concept is being used successfully in larger underground operations.

Jan 1, 1984

By Alan R. Cameron, William W. Forsyth, Tom H. Kleine

In the production environment, the current limits of blasting are most often defined by the ability of the operator to drill blastholes from a planned collar location to the required toe location. Many problems which are initially described as deficiencies in blasting or support are directly related to drilling. The assessment of support performance and blasting efficiency must begin with a detailed examination of drilling practices.

Jan 1, 1995

By Calvin J. Konya

For proper blast design, one must make the assumption that all blastholes release nearly ideal energy. In many types of blasting operations, blastholes release very little useful energy. These blastholes are called malfunctioning blastholes. Recent studies indicate that as many as 30 percent of all blastholes are malfunctioning. These malfunctioning blastholes are not an unusual occurrence.

Jan 1, 1988