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EVALUATION OF PILLAR STRENGTH USING NUMERICAL MODELING, CASE STUDY: TABAS COAL MINE
Abstract
Pillars are key structural columns in underground mining. They are usually made of in situ intact ores and do not have additional reinforcements. Their main function is temporary or permanent support of ore ceiling of rooms during excavation and mining. Coal pillar strength is usually estimated according to empirical formulae obtained from field observations. Todays, numerical models have found increasing use in pillar design. The FLAC3D Software based Mohr-Coulomb Strain Softening (MCSS) failure criterion was used to estimate pillar bearing capacity. By this study, it’s shown that pillars with 15 meter width in Tabas coal mine have 9.84 MPa strength and have the similar result by Salamon and Munro formula.
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