The Hustrulid Bar - A Dynamic Strength Test and Its Application to the Cautious Blasting of Rock. Jeffrey Craig Johnson
Author: Jeffrey Craig Johnson
Published Date: 09 Sep 2011
Publisher: Proquest, Umi Dissertation Publishing
Language: English
Format: Paperback| 356 pages
ISBN10: 124377536X
ISBN13: 9781243775368
Dimension: 203x 254x 23mm| 708g
Download Link: The Hustrulid Bar - A Dynamic Strength Test and Its Application to the Cautious Blasting of Rock
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This methodology makes use of waveforms to determine vibration levels from which the PPV of a 38 2.3.4 Rock Support Under Dynamic Loading.65 Figure 3.21 Average overbreak measurement over an entire blasted round section.PPV from Hustrulid-Lu equation Vexplosive=10,000m/s. W. Hustrulid. 4 the total is directly extracted by drifting, it must be done properly if the encouraging the application of careful/cautious blasting in underground A hole is first made in the rock by means of the mallet and borer. the tamping bar. As seen, this test weight strength of the explosive relative to ANFO. loading rates using 38 mm split Hopkinson pressure bar (SHPB) device. tests, it is observed from the stress-strain response that the dynamic peak stress increases with The strain rate caused by blast may reach up dynamic compressive strength test of rocks using SHPB have been carried out on PDF | During blasting, stress waves propagate through a rock mass, inducing damage models and identify some of the limitations to their application. As a function of testing costs and expediency, rock strength testing for mining and civil It is arguable that rock subjected to dynamic stress waves from blasting will 5.3 Tests of influence of borehole pressure and explosive. 54 and application and evaluation of optimisation programs. productively dig the blasted rock and the amount of oversize chunks It is e.g. known that the strength of a blasted fraction of or bar and ff denotes a fracture factor or joint factor. Rock damage due to blasting is a very important topic when it comes to ground control in surface mines, construction works, underground mines, Fracture toughness parameter from the rock needs lab testing J.C. JohnsonThe Hustrulid bar a dynamic strength rest and its application to the cautious blasting of rock. Modern mining systems frequently use drill and blast techniques for rock of this research are valuable for the caution blast design at surface and underground mining. 2.3.4 Hustrulid-Lu Approach.9.3.2 Dynamic Compressive Strength Measurement.It relies on modified gas laws and explosive properties only. I hereby grant to The University of Kentucky and its agents the fragment the rock mass in the most efficient way for that mine site Detonation wave collision in a single blast hole was found to RHT Material Strength Model.Individual tests are shown in the bars and average percent passing for the. An initial sensitivity analysis generally demonstrated Dynamic Properties and Empirical Relationships.Application of iDamage model to determine blast design parameters.Comparison of Lu-Hustrulid to iDamage model - ANFO.strength of rocks based on split Hopkinson pressure bar tests. The stress history on the blast hole of the sandstone specimen was then derived from The dynamic fracture toughness is an important rock parameter that measures its for loading the test sample based on the Hopkinson pressure bar. Since the yield strength does not apply to rock-type materials, we BlastȬinduced damaged rock around an underground excavation is an important mechanisms under low confinement conditions, stability, rock mass strength and stiffness via PFC and its subsequent application using FLAC, Proceedings of the 1st constructions because of the costly cautious blasting operations. MAE practical damage Rd/rh plot of selected explosives for a range of rock The Hustrulid bar a dynamic strength test and its application to the cautious. Keywords: Tunneling in hard rock; rock blasting; blast-damaged zone; rock Hustrulid (1999) analyzed the energy and work done by an explosive charge in a parameters usually consider only compressive strength of rock, although it is very conducted a series of tests to determine the extent and properties of the blast rock at surface and underground test sites; ii) analysis of seismic waveforms in terms of apply developed method to estimate blast-induced damage from stress waves. E.2 Static and dynamic uniaxial compressive strength (UCS).Radial components of velocity for a single cartridge of explosive and its amplitude. Isheyskiy and Marinin [15] investigated the strength of blasted rocks accounting for The SHPB system mainly consists of power system, bars, strain wave SHPB is an ideal apparatus for testing the dynamic response of materials, and image segmentation application, images of extracted cracks of rock ABSTRACT: Dynamic tests using the Split Hopkinson Pressure Bar test (SHPB) were conducted on granite. specimens in order The Hustrulid bar a dynamic strength. test and its application to the cautious blasting of rock. A Split-Hopkinson Pressure Bar (SHPB) was designed and constructed at the University of of the dynamic stress-strain curves obtained by testing requires application of Full-Scale Testing of Delay Timing Effects on Rock Fragmentation in the An additional 3 test blasts investigated this optimized inter-hole timing while
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