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Geomechanics and Engineering
  Volume 14, Number 5, April10 2018, pages 491-498
DOI: http://dx.doi.org/10.12989/gae.2018.14.5.491
 


EMI database analysis focusing on relationship between density and mechanical properties of sedimentary rocks
Michael Burkhardt, Eunhye Kim and Priscilla P. Nelson

 
Abstract
    The Earth Mechanics Institute (EMI) was established at the Colorado School of Mines (CSM) in 1974 to develop innovations in rock mechanics research and education. During the last four decades, extensive rock mechanics research has been conducted at the EMI. Results from uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), point load index (PLI), punch penetration (PP), and many other types of tests have been recorded in a database that has been unexamined for research purposes. The EMI database includes over 20,000 tests from over 1,000 different projects including mining and underground construction, and analysis of this database to identify relationships has been started with preliminary results reported here. Overall, statistically significant correlations are identified between bulk density and mechanical strength properties through UCS, BTS, PLI, and PP testing of sedimentary, igneous, and metamorphic rocks. In this paper, bulk density is considered as a surrogate metric that reflects both mineralogy and porosity. From this analysis, sedimentary rocks show the strongest correlation between the UCS and bulk density, whereas metamorphic rocks exhibit the strongest correlation between UCS and PP. Data trends in the EMI database also reveal a linear relationship between UCS and BTS tests. For the singular case of rock coral, the database permits correlations between bulk density of the core versus the deposition depth and porosity. The EMI database will continue under analysis, and will provide additional insightful and comprehensive understanding of the variation and predictability of rock mechanical strength properties and density. This knowledge will contribute significantly toward the increasingly safe and cost-effective geostructures and construction.
 
Key Words
     rock mechanics database; earth mechanics institute (EMI); bulk density, mechanical properties of rock; uniaxial compressive strength (UCS); Brazilian tensile strength (BTS); point load index (PLI), and punch penetration (PP) test
 
Address
Michael Burkhardt: Department of Mining Engineering, Colorado School of Mines, Golden, Colorado, U.S.A.

Eunhye Kim and Priscilla P. Nelson: 1.) Department of Mining Engineering, Colorado School of Mines, Golden, Colorado, U.S.A.
2.) Center for Underground Construction and Tunneling, Colorado School of Mines, Golden, Colorado, U.S.A.
 

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