Numerical simulation of coal pillar strength |
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| Authors: | Ashok Jaiswal BK Shrivastva |
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| Affiliation: | 1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;2. Synergism Innovative Center of Coal Safety Production in Henan Province, Jiaozuo 454000, China;1. School of Environment Science and Spatial Information, China University of Mining and Technology, Xuzhou 221116, China;2. Department of Mining Engineering, West Virginia University, Morgantown, WV 26506, USA;3. Department of Civil and Environment Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223-001, USA;1. Department of Mining, Petroleum and Geophysics Engineering, Shahrood University of Technology, Daneshgah Blvd., P.O. Box 3619995161, Shahrood, Iran;2. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;1. CSIR–CIMFR (Council of Scientific and Industrial Research–Central Institute of Mining and Fuel Research), Barwa Road, Dhanbad 826001, Jharkhand, India;2. NIRM, Champion Reefs, KGF, Karnataka, India;3. Camborne School of Mines, University of Exeter, Cornwall Campus, Penryn TR10 9 FE, Cornwall, UK |
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| Abstract: | The present paper describes an approach for estimation of strain-softening constitutive behaviour of coal-mass through calibration of a numerical model with field cases. A three-dimensional finite element model was used, in which the coal-mass was considered to be a Hoek–Brown strain-softening material. Dilation behaviour was considered to be a function of confinement and plastic shear strain. The numerical model was calibrated by satisfying the (1) various failed/stable cases of coal pillar of Indian coal mines and (2) post-failure behaviour of large-scale coal pillars determined by various researchers through conducting in-situ tests. The calibration of the model was done by taking various permutation and combination of strain-softening parameters. It has been concluded that the yielding of the pillars start almost at 2/3 of the peak strength. The statistical expressions for estimation of pillar strength for Indian coal mines and post-failure modulus have been developed by analyzing the results of the simulations. For Indian coal pillars having width-to-height ratio (w/h) less than five, the pillar strength was almost linearly dependent on w/h, and non-linearly dependent on uniaxial compressive strength of the coal specimen. The post-failure modulus of coal pillars was non-linearly dependent on w/h, and not significantly dependent on the uniaxial compressive strength. |
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