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Sunday, July 26, 2020 | History

3 edition of Spherical Propagation of Explosion-Generated Strain Pulses in Rock. found in the catalog.

Spherical Propagation of Explosion-Generated Strain Pulses in Rock.

United States. Bureau of Mines.

Spherical Propagation of Explosion-Generated Strain Pulses in Rock.

by United States. Bureau of Mines.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 5483
ContributionsDuvall, Wilbur I., Petkof, B.
ID Numbers
Open LibraryOL21745286M

Fogelson DE, Atchinson TC, Duvall WI () Propagation of peak strain and strain energy for explosion-generated strain pulses in rock. In: Proceedings of the 3rd US Symposium on Rock .   As a step in the solution of the problem of propagation of a seismic pulse in a spherical earth, an exact solution is obtained for the motion of a uniform compressible fluid sphere due to a pressure pulse from a point source situated below the surface. The time variation of pressure due to the source is represented by the difference between two step functions with rounded shoulders.

In particular, single-chain assemblies of disks and spheres were subjected to explosive loadings and strain gauges were used to collect the resulting strain pulse information. The data were analyzed to compare the pulse velocity, contact load attenuation, dispersion, and pulse . The strain gauges at positions 1 and 2 show that the explosive charge has produced a strain pulse in the bar, Fig. 2. The peak strain is over /ie at gauge station 1 but has decreased to about /xe at gauge station 2. The duration of the pulse is 80j*s at station 1 and ?is at station 2.

Expressions for the velocity of a plastic shock wave and phase velocity of longitudinal waves in an elastoplastic medium with hardening are obtained in a quasiacoustic approximation. Spherical propagation of explosion generated strain pulse in rock, Report of Investigation RI , US Bureu of Mines, p. 21, Washington, D.C. Duvall W.I., Petkof B., Reviev of criteria for estimating damage to residences from blasting vibration, Report of Investigation RI , US Bureu of Mines, Washington, D.C.


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Spherical Propagation of Explosion-Generated Strain Pulses in Rock by United States. Bureau of Mines. Download PDF EPUB FB2

Additional Physical Format: Online version: Duvall, Wilbur I. Spherical propagation of explosion-generated strain pulses in rock (OCoLC) David Fogelson, Thomas C. Atchison, Wilbur I. Duvall; Propagation of Peak Strain and Strain Energy From Explosion-Generated Strain Pulses in by: 1.

Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) http Author: Wilbur I.

Duvall and Benjamin. Petkof. In the case of commercial explosives in rock, the strain pulse is a highly damped oscillating wave train the characteristics of which depend on the properties of the rock (its density, Young's modulus, and Poisson' ratio), on the radius of the cavity, and on the properties of the explosive (its explosion pressure P and the ratio of the specific Cited by: The rock has an average density of lb/ft3 and a dilata- tional wave velocity of 18, ft/sec.

Experimental procedure The tests were performed in 50 ft vertical drill holes, both charge and gage positions being chosen to avoid surface breaking and to permit the recording of the direct strain pulse without interference from surface by: Duvall, W. I., and B.

Petkof: Spherical Propagation of Explosion-generated Strain Pulses in Rock, U.S. Bureau of Mines Report of InvestigationsGoogle Scholar [8]. 1. Introduction. A “site law” (predictor equation) can be defined as the mathematical expression to describe the attenuation of the vibrations in the rock masses produced by blasting; the site law is not characteristic of a site but rather, at most, of a particular kind of process, performed within a range of operating conditions, at a given site.

Journals & Books; Help; COVID campus 21 PP. 12 Duvall, W.I. and Petkof, B., Spherical propagation of explosion--generated strain pulses in rock. US Bur. Mines RI (), 21 pp. 13 Langefors, U. and Kihlstrom, B., Rock Blasting.

Wiley, New York (), pp. 14 Indian Standards Institute, Criteria for safety and design of. Powder factors for hard rock are higher than for soft rock because of the large taconite and hard limestone are higher than hematite and soft limestone.

I.W., and Petkof, B.,Spherical Propagation of Explosion-Generated Strain Pulses in Rock, BuMines RI Explosives, BuMines RI Google Scholar.

Fogelson, D.E., Duvall. For the spherical pulse, the numerical analysis gives this critical radius as between 3 and 4 hole radii, depending mainly on Poisson's ratio of the rock. The question may arise: "to what extent are the theoretical results for a simple exponential pulse valid for an actual explosion-generated wave?".

Propagation of Peak Strain and Strain Energy From Explosion-Generated Strain Pulses in Rock David Fogelson ; Thomas C. Atchison ; Wilbur I.

Duvall View article. Thus, pressure pulse propagation could lead to variations of permeability due to effective pressure variations. Combining mass conservation and Darcy’s law Eq.

and neglecting fluid and rock compressibilities, fluid propagation can modelled with a simple 1D diffusion equation [e.g. Ref. 82]: (10) ∂ p (z) ∂ z = C (t), where C is a. Duvall WI, Petkof B () Spherical propagation of explosion generated strain pulses in rock.

USBM Report of Investigation Fisne A, Kuzu C, Hudaverdi T () Prediction of environmental impacts of quarry blasting operation using fuzzy logic.

Spherical Propagation Of Explosion Generated Strain Pulses In Rock" (). Strain Wave Theory In Rock Blasting" 8 th Rock Mechanics Symposium. The peak strain for a plane Voigt wave is found to decay approximately as the distance χ − Pulse length also increases with distance.

Displacement is nonoscillatory, increasing to a fixed value with time. A real time integral solution for the spherical Voigt equation is obtained by using Laplace transforms and appropriate operational. Duvall WI, Petkof B () Spherical propagation of explosion generated strain pulses in rock.

Report of Investigation. US Bureau of Mines, Pittsburgh, pp – Blasting operations create significant problems to residential and other structures located in the close proximity of the mines.

Blast vibration is one of the most crucial nuisances of blasting, which should be accurately estimated to minimize its effect. In this paper, an attempt has been made to apply various models to predict ground vibrations due to mine blasting.

Recordings were made of seismic pulses produced by explosive sources in rock underground at Mount Isa Mine, Queensland, Australia. Analysis of the experimental results in light of the theory of Kjartansson () indicates that the simple rise time law τ = τ 0 + CT/Q is inadequate for describing the attenuation of seismic pulses generated by a realistic source.

[9] DUVALL W I, PETKOF B. Spherical propagation of explosion generated strain pulses in rock [J]. USBM Report of Investigation21– [10] BLAIR D P. Non-linear superposition models of blast vibration [J]. International Journal of Rock Mechanics and Mining Sciences,45 (2): – [11] LU Wenbo, HUSTRULID W.

Recordings were made of seismic pulses produced by explosive sources in rock underground at Mount Isa Mine, Queensland, Australia. Analysis of the experimental results in light of the theory of Kjartansson () indicates that the simple rise time law τ = τ 0 + CT /Q is inadequate for describing the attenuation of seismic pulses generated by a realistic source.

Figure is a typical propagation loss curve for the waters off Iceland in the summer for a frequency of 2 Khz. Note that the propagation losses for the three sound paths previously described are plotted. Multiple bottom bounce losses were measured and mul-tiple convergence zones were estimated.The second new predictor is a computer program simulating blasts including blast geometry, charge distribution, and detonation sequence and simulating propagation of individual pulses to any point.Book.

Jan ; Charles H Dowding Spherical propagation of explosion-generated strain pulses in rock. Article. Jul ; W.I. Duvall each source and is an oversimplification of the process.