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Saturday, August 1, 2020 | History

2 edition of effects of geology on perimeter control blasting found in the catalog.

effects of geology on perimeter control blasting

Roy R. Levesque

effects of geology on perimeter control blasting

by Roy R. Levesque

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  • 12 Currently reading

Published by Laurentian University, School of Engineering in Sudbury, Ont .
Written in English


Edition Notes

Statementsubmitted by Roy R. Levesque
The Physical Object
Paginationviii, 31 l. :
Number of Pages31
ID Numbers
Open LibraryOL20696180M

Thus blast vibration monitoring in the future is likely to move toward increased reliance on structural strains to control the effects of blasting and construction vibrations. While peak particle velocity is a relatively easily measured index parameter that correlates with the observed occurrence of cosmetic cracks, strain is a more fundamental. Improvements in blast design (e.g., computer-simulation-assisted design) would improve perimeter control, casting, and control of fragment size and would result in large energy savings by decreasing the need for downstream crushing and grinding. New methods of explosive tailoring and timing would also have significant benefits.

Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road result of rock blasting is often known as a rock cut.. Drilling and blasting currently utilizes many different varieties of.   McKnow AF () Perimeter control blasting for underground excavations in fractured and weathered rock. Bulletin of the association of Engineering geologists XXIII(4)– Google Scholar Muller B, Bohnke R () Theoretical simulation and practical results at the optimization of blasts in rock masses based on momentum theory.

blasting, or sculpture blasting, is the most widely used method of controlling overbreak in underground openings like headings and stopes It is similar to presplitting in that it involves a row of holes at the perimeter of the excavation that is more lightly loaded and more closely spaced than the other holes in the blast . The newly developed light sectioning method has been used to investigate some of the causes and costs of overbreak and underbreak. Investigations at the Aquamilpa Hydroelectric Project in Mexico have shown decreased overbreak and increased underbreak as a result of increased rock quality and decreased explosive energy. A new measure of explosive energy, the ‘perimeter powder factor’ (PPF.


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Effects of geology on perimeter control blasting by Roy R. Levesque Download PDF EPUB FB2

The geological features of a rock mass have a direct influence on its blasting characteristics. It has been observed that perimeter control techniques provide excellent results in massive.

Sci.Paper No. EFFECTS OF THE GEOLOGICAL PARAMETERS ON ROCK BLASTING USING THE HOPKINSON SPLIT BAR Bahman BohloliI 1 Department of Geology, Chalmers University of Technology, S 96, Gothenburg, Sweden ABSTRACT One of the important problems of aggregate production is generation of fine materials ( mm) and oversize blocks (>1 m3).Cited by:   two perimeter holes.

When the optimization of blast design to control blast A study was conducted to evaluate the effect of heavy blasting in open-pit coal mines on the stability of.

effect of geological structure and blasting practice in fly rock accident at johor, malaysia Blasting operation is common method in hard rock excavation at civil engineering and mining sites. Rock blasting results in the fragmentation along with environmental hazards such as fly rock, ground vibration, air-blast Cited by: 2.

Blasting still remains the most cost effective method of hard rock fragmentation but it often inflicts damage to the surrounding rock. Blast damage to the periphery of an excavation is directly related to the level of stress experienced by the rock and its pre-blasting condition.

Blast damage control reduces scaling time and dilution, allows easier and effective support installation and. Appendix A – Impact of Blasting on Groundwater Impacts of Blasting on Groundwater 1 Introduction Both geology and soils play an important part in determining the environmental characteristics of a region.

The underlying geology has a major influence on landform, and rocks provide the parent material from which soils effects of geology on perimeter control blasting book created. This report presents a new concept in perimeter control blasting for underground metal/nonmetal mine drifting applications focusing on the importance of the buffer holes in a blast design.

The new blast design concept applies the understanding of radial damage that is. smaller blast pattern dimensions to get a better powder distribution. The explosive charges should be concen-trated in the hard rock. Jointing Jointing can have a pronounced effect on both fragmenta-tion and the stability of the perimeter of the excavation.

Close jointing usually results in good fragmentation. Controlling the Adverse Effects of Blasting This module addresses the control of offsite impacts that result from blasting, namely: • vibrations, • airblast, and • flyrock. Much of the information in the module is derived from the Surface Mining Control and Reclamation Act of (SMCRA).

The performance standards apply to all. Geology can have pronounced effects on the results of controlled blasting / wall control blasts. example, it is known that trim blasting does not. Geology This module presents information regarding fundamental rock properties and the geologic structures encountered during blasting operations.

Geology can vary widely and has a great impact on drilling and blasting efficiencies. Highwall cut showing horizontal bedding planes cut by inclined joints that offset beds in the limestone. The economic analysis of the use of explosives is an important part of blasting operations in mining and construction.

Explosives are energy, and the efficient use of this energy is a major factor in keeping rock blasting costs under control. High-energy explosives enhance fragmentation, which ultimately produces a positive effect on production.

The results of controlled blasting are primarily a function of the geology, especially the number and orientation of joint and fracture planes and the quality of the final rock surface that is required. blasting. Limiting of overbreak with good perimeter blasting Cautious blasting practices such as presplitting and smooth blasting are well known (e.g.

Persson et al., ), but not always applied in deep level mines. There is a tendency to consider mine tunnels as temporary access ways, but how many mines are using tunnels that are thirty or.

Air decking is a widely used controlled blasting technique that requires an air space in the blast hole above the explosive purpose of this air space, called a deck or air-deck, is to allow for the gases generated during the detonation process to fill the void instead of being forced into the adjacent rock mass.A conceptual diagram of a borehole with an air deck is shown in Fig.

@article{osti_, title = {Environmental effects of blasting and their control}, author = {Siskind, D E and Stagg, M S}, abstractNote = {Five major environmental effects of rock blasting are ground vibrations, airblast, flyrock, dust and fumes.

What makes them {open_quotes}environmental{close_quotes} as opposed to occupational health and safety issues is. Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Pre-splitting, Selecting and employing various parameters of blast design, using modern technology, Precise and accurate timing delays, Muffle blasting at critical and congested areas.

4 5. Blasting operations cause several adverse environmental effects. with the development of new explosives systems and initiation devices, blast design and execution techniques, the blasting process has now become more efficient and safer than before.

use of software tools for blast design, support in execution, blast monitoring and analysis makes it possible that damages and dangers from. the effects of blasting adjacent to State ROW, the Engineering Geology Section should be contacted for advice.

Blasters in New York State are required to posses a valid New York State Department of Labor (NYSDOL) issued Blaster Certificate of Competence. The Blaster Certificate of Competence.

Tunnelling in Rock by Drilling and Blasting presents the latest developments in the excavation of tunnels using the drilling and blasting method. Examples of work conducted throughout the world including the Indian sub-continent, Australia, and Sweden amongst others are discussed.

These tunnel projects serve to illustrate the challenges and importance of drilling accuracy, the effect of. bounds of the blast area, (b) clearing employees from the blast area, (c) effective access control, (d) use of adequate blasting shelters, (e) efficient communications, and (f) training.

Fundamentals are reviewed with an emphasis on analyzing task elements and identifying root causes for selected blasting. Seismic Effects of Blasting in Rock book. Seismic Effects of Blasting in Rock. DOI link for Seismic Effects of Blasting in Rock.

Seismic Effects of Blasting in Rock book. By A.A. Dauetas. Edition 1st Edition. First Published eBook Published 1 November Pub.

location London. Imprint Routledge.The effect that blasting has on grade control is rarely adequately accounted for when the rock is excavated because there has never been an accurate and practical method for measuring blast movement.

This paper draws on over six years of research into measuring and understanding blast movement, which started at the Julius Kruttschnitt.