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Comparison of closure measurements with finite element model results in an underground coal mine in central Utah

Comparison of closure measurements with finite element model results in an underground coal mine in central Utah
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摘要 Quantitative analysis of mine-wide subsidence at the kilometer scale and details of stress distribution about an advancing longwall face are estimated using an adaptation of the finite element method. The method is well suited to the tasks at hand. For greater realism, variability of strata properties is taken into account as are the effects of joints and cleats on elastic moduli and strengths. Evolution of pillar stress and entry closure remote from the face is readily quantified in a series of analyses that simulate face advance. Computed results compare favorably with the evolution of closure measurements about an instrumented pillar in a two-entry headgate. The appropriateness of the finite element method is confirmed. This method is based on first principles that avoid empirical schemes of uncertain applicability and numerical models ‘‘calibrated" by fitting computer output to mine measurements. Quantitative analysis of mine-wide subsidence at the kilometer scale and details of stress distribution about an advancing longwall face are estimated using an adaptation of the finite element method. The method is well suited to the tasks at hand. For greater realism, variability of strata properties is taken into account as are the effects of joints and cleats on elastic moduli and strengths. Evolution of pillar stress and entry closure remote from the face is readily quantified in a series of analyses that simulate face advance. Computed results compare favorably with the evolution of closure measurements about an instrumented pillar in a two-entry headgate. The appropriateness of the finite element method is confirmed. This method is based on first principles that avoid empirical schemes of uncertain applicability and numerical models ‘‘calibrated' by fitting computer output to mine measurements.
出处 《International Journal of Mining Science and Technology》 EI CSCD 2019年第1期9-15,共7页 矿业科学技术学报(英文版)
基金 Financial support by the National Institute of Safety and Health under Contract 200-2016-90240, MIS Analysis and DINSAR Measurements-Tools for Improving Mine Ground Control Safety is gratefully acknowledged
关键词 Finite element MODELING LONGWALL mining MINE SUBSIDENCE Stress MODELING Finite element modeling Longwall mining Mine subsidence Stress modeling
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