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Appears in Collections:Management, Work and Organisation Journal Articles
Peer Review Status: Refereed
Title: Logical design of yield pillar base in longwall mining
Author(s): Oraee, Kazem
Hosseini, Navid
Gholinejad, Mehran
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Keywords: Longwall
Yield pillar
Strain softening
Coal mines and mining
Longwall mining
Issue Date: Oct-2008
Date Deposited: 23-Dec-2009
Citation: Oraee K, Hosseini N & Gholinejad M (2008) Logical design of yield pillar base in longwall mining. Metal Mine, 10, pp. 706-712.
Abstract: Longwall is one of the most widely used methods in mining horizontal and gently dipping coal seams. It is a high production method that requires high initial capital investment. Such characteristics enhance the importance of initial design and hence design process. The entries on both sides of the face are integral parts of the method whose accurate design adds to increased profitability and safety of the mining operation. In this paper, two strain-softening models based on analytical fundamentals have been adopted. These models have been applied to a series of yield chain pillars in a coal seam with the depth of 700 meters. Results obtained from this analysis show that such models can be used in deep coal mining and they produce optimum design dimensions and hence they could be adopted as a valid base for logical design of chain pillars. Finally, sensitivity analysis of the results show that the final design is highly sensitive to the pillar behavior after the coal peak strength. This further demonstrates the validity of the method as a useful tool in designing pillars in longwall deep coal mining.
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