Dynamic strength and fragmentation of selected rocks under impact loading

U. Prasad, B. Mohanty, J. A. Nemes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Understanding the fracture process in rock under high strain rate loading is essential to quantifying the blasting process and predicting the degree offragmentation in rock blasting. However, compared to our knowledge base on the detonation properties of commercial explosives, the properties of rock that control the fracture process are relatively poorly known. In this study, a set of twelve rock types covering a wide range in mineralogy, texture and homogeneity were investigated for their compressive strength under high strain rate loading. The corresponding static compressive strengths were also measure in the same rock types and in identical dimensions tor comparison. The resulting fragments after each test were analysed for size distribution. A Split Hopkinson Bar apparatus was used to generate the required high strain rate loading. The dynamic compressive strength at a strain rate of 103 Isec was found to range between 2.5 and 4.6 times the corresponding static strength. The resulting particle size distribution under dynamic fracture process was also found to be much smaller than that of the static case, and correlated well, unlike the hitter, with the dynamic compressive strength.

Original languageEnglish (US)
Title of host publication4th North American Rock Mechanics Symposium, NARMS 2000
PublisherAmerican Rock Mechanics Association (ARMA)
Pages577-581
Number of pages5
ISBN (Print)9058091554, 9789058091550
StatePublished - Jan 1 2000
Event4th North American Rock Mechanics Symposium, NARMS 2000 - Seattle, United States
Duration: Jul 31 2000Aug 3 2000

Publication series

Name4th North American Rock Mechanics Symposium, NARMS 2000

Conference

Conference4th North American Rock Mechanics Symposium, NARMS 2000
CountryUnited States
CitySeattle
Period7/31/008/3/00

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

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