Research on pressure-relief effort of mining upper-protective seam on protected seam
Based on the mining and geological conditions in No. 12 Mining District of Jining No.3 Coal Mine, the variation laws of stress and deformation of the lower-protected seam along with the mining operation of upper-protective seam are studied by numerical simulation and field test in this paper. The results show that the distribution of in situ stress in protected seam is changed correspondingly during the protective seam mining. While mining the protected seam, the vertical stresses around the protected seam experienced three stages: stress increasing before mining, decreasing after mining and stepwise steady stage. In addition, the protective seam mining can also cause expansive deformation in protected seam and its surrounding rock, destroy the strata structure and release the elastic energy in advance, thus reducing the rock burst risk in protected seam. The results of numerical analysis and the field monitoring results are basically in agreement. The study in this paper will provide theoretical basis and practical value for reasonable design and safety mining of coal seams with rock burst propensity.
rock burst protective seam protected seam numerical simulation stress-meter monitoring
WU Xiang-Qian DOU Lin-Ming LV Chang-Guo CAO An-Ye ZHANG Ming-Wei
State Key Laboratory of Coal Resources and Mine Safety, School of Mines, China University of Mining State Key Laboratory of Coal Resources and Mine Safety, School of Mines, China University of Mining
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1197-1204
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）