Experimental study on load-unload response ratio (LURR) of brittle rocks

Fangcai Zhu, Lianyang Zhang

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

Abstract

The load-unload response ratio (LURR) reflects the damage evolution of rocks and, thus, is a good way to describe rock stability. With the background of stopping in a metal mine, this paper studies the relationship between LURR and damage of brittle rocks. Based on the elasto-brittle damage theory, the analytical expressions of LURR were first derived for brittle rocks under both uniaxial and conventional triaxial loading/unloading conditions. Then, uniaxial and conventional triaxial loading/unloading tests were conducted on brittle rocks. The experimental results indicate that the LURR varies greatly at the initial stage, possibly due to the compaction and heterogeneity of rock. As the load increases, the LURR keeps almost constant with occasional fluctuation, possibly due to propagation of local cracks. When the rock is close to failure, the LURR presents abrupt increase or great fluctuation. The experimental results are in reasonable agreement with the derived analytical expressions of LURR.

Original languageEnglish (US)
Title of host publicationRock Mechanics and Its Applications in Civil, Mining, and Petroleum Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Pages5-12
Number of pages8
Edition237 GSP
ISBN (Print)9780784413395
DOIs
StatePublished - Jan 1 2014
Event2014 GeoShanghai International Congress: Rock Mechanics and Its Applications in Civil, Mining, and Petroleum Engineering - Shanghai, China
Duration: May 26 2014May 28 2014

Publication series

NameGeotechnical Special Publication
Number237 GSP
ISSN (Print)0895-0563

Other

Other2014 GeoShanghai International Congress: Rock Mechanics and Its Applications in Civil, Mining, and Petroleum Engineering
CountryChina
CityShanghai
Period5/26/145/28/14

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Zhu, F., & Zhang, L. (2014). Experimental study on load-unload response ratio (LURR) of brittle rocks. In Rock Mechanics and Its Applications in Civil, Mining, and Petroleum Engineering - Selected Papers from the Proceedings of the 2014 GeoShanghai International Congress (237 GSP ed., pp. 5-12). (Geotechnical Special Publication; No. 237 GSP). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784413395.002