Analytical expression for vertical stresses within an inclined mine stope with non-parallel walls

Ting, Ching Hung, Sivakugan, Nagaratnam, Read, Wayne, and Shukla, Sanjay Kumar (2014) Analytical expression for vertical stresses within an inclined mine stope with non-parallel walls. Geotechnical and Geological Engineering, 32 (2). pp. 577-586.

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Abstract

Arching is a phenomenon that occurs in many situations in geotechnical engineering. When underground mine stopes are backfilled, a significant fraction of the self-weight of the backfill is carried by the side walls. As a result, the vertical stress at the bottom of the stope is significantly less than its overburden pressure. Few analytical expressions published in the literature can be used to determine the vertical stresses of stope with parallel walls. The objective of this paper is to extend the analytical solution previously developed by the authors to long plane-strain stopes with non-parallel walls with both slopes leaning to the same side. Different combinations of wall inclination are examined using the new analytical expression developed. To validate the analysis, the proposed results are compared with numerical model results. The results show that the proposed analytical expression is capable of estimating the vertical stress within mine stopes when the inclination of the hangingwall to the horizontal (α) is less than that of footwall (β). An important behavioural trend for the stress distribution is observed, where with the same overburden pressure and base width, the stress magnitude experienced by fill material significantly varies depending on the wall inclination.

Item ID: 32788
Item Type: Article (Refereed Research - C1)
Keywords: arching, backfills, mine stopes, non-parallel walls
ISSN: 1573-1529
Date Deposited: 29 May 2014 00:56
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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