Arching within hydraulic fill stopes |
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| Authors: | Kandiah Pirapakaran Nagaratnam Sivakugan |
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| Institution: | (1) School of Engineering, James Cook University, Townsville, Queensland, 4811, Australia |
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| Abstract: | Arching is a well known phenomenon, which effects stress developments which were investigated and compared using analytical
and numerical solutions. Marston’s (1930) solution was extended to a generalised 3-dimensional rectangular stope and later modified for square and circular stopes
for comparison with FLAC results. Aubertin et al. (2003) & Li et al. (2003) models were improved significantly by placing the backfill within narrow stopes as lifts or layers in numerical modelling
where the normal stress variation with depth were found to be more realistic. The FLAC results were compared with analytical
solutions which were developed by previous researchers and modified by the authors to evaluate the arching effects in backfilled
placed in narrow and circular stopes. It appeared from the investigation herein that δ = 0.67 ϕ and K = K
o condition gives a very close match with the numerical model solutions obtained from FLAC. Many laboratory tests were conducted
to find out friction angles for four Australian mines, which were between 30 and 49 degrees. |
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| Keywords: | Arching Overburden Backfill Stopes Numerical modelling Mining |
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