Stability analysis of open stope draw point using numerical modelling
Sublevel stoping method is one of the most popular mining methods in Canadian underground metal mines. In this method,as the ore is blasted and drawn from the stope,there is less rock mass to support the stope walls and hence there is the risk that the stope walls especially near the draw point or brow will deteriorate and tend to cave before the stope is completely mined out. When this occurs,it imposes serious safety issue hence having to adopt remote control LHD in Canadian mines and causing adverse effects on the economics of the operation. Mine stope stability in Canadian mine is traditionally carried out with the empirically-based stability graph method. This method does not specifically provide stability design guideline for stope draw point or brow. In this paper,a numerical method to assess the stability of non-entry stope draw point in sublevel stoping environment is presented,which is based on 3D linear boundary element modelling of the stresses and strength factor around the draw point. The model parametric study examines the influence of critical influential factors. Stress redistribution as a stability indicator will serve as a basis for assessing the effect of different parameters on the stability of the draw point. The results can serve as a guideline in the draw point design and/or reinforcement design.
Sublevel stoping stope draw point or brow numerical modelling boundary element method parametric study stress redistribution stability analysis
Yaohua Zhang Hani Mitri
Natural Resources/Oil Sands & Mining,AMEC Americas Ltd.,Oakville,Canada Department of Mining and Materials Engineering,McGill University,Montreal,Canada
国际会议
北京
英文
544-553
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）