Document Details Document Type : Article In Conference  Document Title : NUMERICAL MODELING OF YIELDING CHAIN PILLARS IN LONGWALL MINES النمذجة الرقمية لأعمدة الصخور المرنة فى مناجم الحائط العريض   Subject : Mining Engineering  Document Language : English  Abstract : The practice in thick seam long wall mining at depths of 500 m and more shows that considerable sloughing of chain pillars, sometimes accompanied by bumps, may occur during development stage. The ability of these pillars to continue functioning as roof support during development and longwalling stages has to be assured for a safe and economical mining operation. Although already being used, little is known quantitatively about the response of these “yielding” chain pillars to varying loading conditions that come about during different stages of longwall mining. The paper presents the results from case history reviews and numerical modeling studies performed with the objective of improving the understanding of yield pillar behavior. The case history review indicates that yield pillars with width:height ratios 3 to 6 performed satisfactorily. The numerical modeling studies using a three-dimensional finite difference code FLAC3D [1] allowed realistic simulations of complex mining geometries and loading conditions of longwall mining. The numerical model incorporates a strain-softening constitutive model for post-peak pillar behavior and a non-linearly elastic material behavior for simulating gob compaction. The differences in performance of pillars with strain softening material and traditional Mohr-Coulomb material are also highlighted.  Conference Name : 29th International Conference on Ground Control in Mining, Morgantown, 2010.  Duration : From : 15رجب 1431 AH - To : 15رجب 1431 AH From : 27يونيو 2010 AD - To : 29يونيو 2010 AD  Publishing Year : 1431 AH 2010 AD  Number Of Pages : 11  Article Type : Article  Conference Place : Morgantown, West Virginia, USA  Organizing Body : West Virginia university  Added Date : Sunday, March 20, 2011  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email صلاح أحمد بدر Badr, Salah Ahmed Investigator Doctorate sabadr@kau.edu.sa اور م اوزبى Ozbay, Ugur M Researcher Doctorate mozbay@mines.edu Files File Name Type Description  29327.pdf pdf NUMERICAL MODELING OF YIELDING CHAIN PILLARS IN LONGWALL MINES Back To Researches Page