Journal
INTERNATIONAL JOURNAL OF GEOMECHANICS
Volume 17, Issue 2, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GM.1943-5622.0000702
Keywords
Mine backfill; Interfaces; Stiffness; Stress distribution; Numerical modeling
Categories
Funding
- China Scholarship Council (CSC) under the Grant CSC [201406460041]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-402318]
- Institut de recherche Robert-Sauve en sante et en securite du travail [IRSST 2013-0029]
- Fonds de recherche du Quebec-Nature et technologies [FRQNT 2015-MI-191676]
- industrial partners of Research Institute on Mines and Environment (RIME UQAT-Polytechnique)
- National Science and Technology Support Program of China [2013BAB02B02]
- Scientific Research Fund of Beijing General Research Institute of Mining and Metallurgy of China [YJ201507]
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Mining backfill is widely used in underground mines worldwide. The stresses in backfilled stopes must be correctly evaluated because they influence the ground stability and the required strength of exposed (horizontally or vertically) cemented backfill. The stress estimation can be accomplished by numerical modeling with or without the use of interface elements between the backfill and rock walls. To date, most numerical models have been developed without the use of interface elements, and only a few have used interface elements with the same shear strength as the backfill. Stress changes resulting from the addition of interface elements or from the variations in the shear strength of interfaces have never been investigated. In this study, these aspects were analyzed with two-dimensional (2D) (plane-strain) numerical models. The stress changes resulting from the variation of the backfill's shear strength were also analyzed. The results show that the stresses decreased as the interfaces' shear strength increased but were relatively insensitive to the variation of the backfill's shear strength. When the interfaces have the same shear strength as the backfill, the consideration of interface elements is not necessary in numerical models because the stress distributions with or without consideration of interface elements are almost identical. When the interfaces are weaker than the backfill, the stresses obtained by the two numerical models can differ considerably, and the interface elements should be used in numerical models.
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