Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 41, Issue 7, Pages 959-975Publisher
WILEY
DOI: 10.1002/nag.2659
Keywords
caving; multi-seam; longwall mining; subsidence; numerical modelling
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Evaluating the induced subsidence is a critical step in multi-seam longwall mining. Numerical modelling can be a cost-effective approach to this problem. Numerical evaluation of longwall mining-induced subsidence is much more complicated when more than one seam is to be extracted. Only a few research works have dealt with this problem. This paper discusses the essential requirements of a robust numerical modelling approach to simulation of multi-seam longwall mining-induced subsidence. In light of these requirements, the previous works on this topic are critically reviewed. A simple yet robust FEM-based modelling approach is also proposed that is capable of simulating caving process, rock mass deterioration and subsidence around multi-seam excavations. The effectiveness of this approach in comparison with two other conventional FEM approaches is demonstrated through numerical examples of two different multi-seam mining configurations. Results show that the proposed numerical modelling approach is the only robust method, which is capable of simulating multi-seam subsidence in both demonstrated cases. Copyright (c) 2016 John Wiley & Sons, Ltd.
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