Investigation into Coal Pillar Stability Affected by Mining Induced Stress Development within Different Coal Pillar Widths in Deep Mining
Understanding and mastering the evolving patterns of mining induced stress (MIS) is the key to control and utilize the action of rock pressure in deep underground mining, especially for designing safe and economic coal pillar widths in longwall mining. The various widths of coal pillars result in differences in deformation, stress and movement of rocks surrounding the gateway and thus strongly influence the stability of coal pillar and maintenance of the gateway. Based on observation and numerical simulation, the characteristics of MIS and the stability of both coal pillar and gateway were synthetically investigated. The results show that the stress distribution laws and deformation characteristics of rocks surrounding gateway are obviously diverse within different widths of coal pillars during caving. Along with the variety of widths of pillars, stress distribution between coal pillar and coal entity could be switched. The deformation and the stability of gateway are determined by the stress distribution and its development of both coal entity and coal pillar. The appropriate width of coal pillar should be designed less than the critical width switched from the coal entity to coal pillar. And the calculating formula of reasonable width of coal pillar is gained. Engineering practice show that research findings provide some theoretical basis for the rational setting of the coal pillar width, the layout, support and maintenance of gateway, the stability control of the rock surrounding gateway and the safe and economic production etc.
coal pillar width surrounding rock stability mining induced stress development numerical simulation deep mining
YANG Ke XIE Guangxiang CHANG Jucai
Key Laboratory of Coal Mine Safety and Efficiently Caving of Ministry of Education, Anhui University Key Laboratory of Coal Mine Safety and Efficiently Caving of Ministry of Education, Anhui University
国际会议
The 2010 International Symposium on Safety Science and Technology(2010 安全科学与技术国际会议)
杭州
英文
1368-1373
2010-10-26（万方平台首次上网日期，不代表论文的发表时间）