Change of the mode of failure by interface friction and width-to-height ratio of coal specimens

查看全文 作　　者：Gamal [1]Rashed;Syd [1]S.Peng

机构地区：[1]Department of Mining Engineering, West Virginia University

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》索引2015年第7卷第3期,共10页

基　　金：sponsored by Coal and Energy Research Bureau and CDC-NIOSH under Grant No.R01OH009532 摘　　要：Bumps in coal mines have been recognized as a major hazard for many years. These sudden and violent failures around mine openings have compromised safety, ventilation and access to mine workings.Previous studies showed that the violence of coal specimen failure depends on both the interface friction and width-to-height(W/H) ratio of coal specimen. The mode of failure for a uniaxially loaded coal specimen or a coal pillar is a combination of both shear failure along the interface and compressive failure in the coal. The shear failure along the interface triggered the compressive failure in coal. The compressive failure of a coal specimen or a coal pillar can be controlled by changing its W/H ratio. As the W/H ratio increases, the ultimate strength increases. Hence, with a proper combination of interface friction and the W/H ratio of pillar or coal specimen, the mode of failure will change from sudden violent failure which is brittle failure to non-violent failure which is ductile failure. The main objective of this paper is to determine at what W/H ratio and interface friction the mode of failure changes from violent to non-violent. In this research, coal specimens of W/H ratio ranging from 1 to 10 were uniaxially tested under two interface frictions of 0.1 and 0.25, and the results are presented and discussed. 关键词：界面摩擦煤样宽度压缩破坏矿井巷道单轴加载暴力行为破坏模式

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Change of the mode of failure by interface friction and width-to-height ratio of coal specimens

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