MODELING OF OVERBURDEN FAILURE UNDER THE CONDITION OF MINING TWO CLOSE-RANGE SEAMS USING ROOM-AND-PILLAR ANDLONGWALL MINING

作     者：张玉卓 王明立 

作者机构：China Coal Research InstituteBeijing100013 

出 版 物：《Journal of Coal Science & Engineering(China)》 (煤炭学报（英文版）)

年 卷 期：2000年第6卷第1期

页      面：10-13页

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：ThefinancialsupportbyNNSFofChinaundertheprojectNo 5972 4 0 9isappreciated 

主　　题：coal pillar overburden failure sub weighting 

摘      要：In this paper, the effect of the remaining coal pillars in a room and pillar section on the long wall face in the lower coal bed are tested by using equivalent material models. The failure laws of the overburden under coal pillars are discussed. A phenomenon of sub weighting has been observed when long wall face is in process under the remaining pillars in room and pillar mining section. It is concluded that, because coal pillars underwent a course of the stress increasing before they were fully destroyed, the existence of the coal pillars would shorten the distance of periodical weighting of the main roof in the long wall face. Based on this, the characteristic equations of the overburden movement under coal pillars are presented.