Document Details Document Type : Article In Conference  Document Title : Simulation of Macro and Micro responses of yielding rock pillar نمذجة التصرفات على المستوى الماكرو و الميكرو لأعمدة الصخور المرنة   Subject : Mining Engineering  Document Language : English  Abstract : Rock structures (e.g. rock pillars) at deep underground environment may fail in violent mode causing loss of life and property. The failure mode is reliant at both rock structure stiffness and the surrounding loading system. The available violent behavior "assessment predictors" relay on empirical relations and field experience. The numerical modeling seems suitable to relate rock structure macro-scale response and micro-scale yielding of its parts, thus a better "assessment predictor" could be developed. A simulation exercise of coal pillar yielding phenomenon was conducted. The pillar yielding was numerically simulated using the FLAC3D program for pillars of width to height ratio range 1 to 9. The yielding was simulated based on Mohr-Coulomb failure criterion with a degraded strength parameters (cohesion and friction angle). Various parts of a pillar footprint show different yielding modes with the changes in pillar width to height ratio. The skin of the pillar is the first part to fail and causing footprint area reduction thus transferring loads to the pillar remnants. The model was able to seize quantitatively the energy transferred to pillar remnants from failed skin. The energy transferred was used as an assessment indicator of violent pillar failure. The simulation results indicate that coal pillar violent failure is initiated in pillars of width to height ratio exceeding four at depths exceeding 400m. The highlighted "assessment indicator" is suitable to replicate the phenomenon for various rock types at different pillar sizes with various loading environment.  Conference Name : The First International Conference on Advances in Interaction & Multiscale Mechanics(AIMM'10)  Duration : From : 17 جماد الاخرة 1431 AH - To : 20 جماد الاخرة 1431 AH From : 31 مايو 2010 AD - To : 2 يونيو 2010 AD  Publishing Year : 1431 AH 2010 AD  Number Of Pages : 8  Article Type : Article  Conference Place : Jeju, Korea  Organizing Body : National Research Foundation of Korea  Added Date : Sunday, March 20, 2011  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email صلاح أحمد بدر Badr, Salah Ahmed Researcher Doctorate sabadr@kau.edu.sa Files File Name Type Description  29328.pdf pdf Simulation of Macro and Micro responses of yielding rock pillar Back To Researches Page