Study on first caving fracture mechanism of overlying roof rock in steep thick coal seam  

作　　者：Zhang Bei Cao Shenggen 

机构地区：[1]State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology [2]Shanxi Provincial Guoxin Energy Development Group Co., Ltd.

出　　处：《International Journal of Mining Science and Technology》2015年第1期133-138,共6页矿业科学技术学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51374197 and 50774078);the National Basic Research Program of China (No. 2015CB251600);the University Discipline Construction Project of Jiangsu Province, Blue Project of Jiangsu Province;the Open Foundation of State Key Laboratory of Coal Resources and Sage Mining (No. SKLCRSM12X06)

摘　　要：Based on the elastic plate theory, a mechanical model of thin plate for the first caving of overlying roof rock in steep mining face was established. The analytical solution of the deflection and stress distribution of roof rocks was obtained. According to the specific geological conditions of the 5-103 panel in Shanxi,the failure of roof rocks and the influence of seam dip on it during the exploitation were theoretically investigated. Meanwhile, the first caving characteristics of the overlying rock in the steep coal seam were investigated based on its stress contour. The results show that the dip angle has a distinct influence on the caving interval and the first caving interval for the 5-103 panel is 37 m in theory. Finally, a systematic monitoring on the behavior of rock pressures was conducted. The measured results agree well with the theoretical prediction, which provides a good reference for practical steep coal seam mining.Based on the elastic plate theory, a mechanical model of thin plate for the first caving of overlying roof rock in steep mining face was established. The analytical solution of the deflection and stress distribution of roof rocks was obtained. According to the specific geological conditions of the 5-103 panel in Shanxi, the failure of roof rocks and the influence of seam dip on it during the exploitation were theoretically investigated. Meanwhile, the first caving characteristics of the overlying rock in the steep coal seam were investigated based on its stress contour. The results show that the dip angle has a distinct influence on the caving interval and the first caving interval for the 5-103 panel is 37 m in theory. Finally, a systematic monitoring on the behavior of rock pressures was conducted. The measured results agree well with the theoretical prediction, which provides a good reference for practical steep coal seam mining.

关 键 词：SteepMining fieldInitial fracture intervalThin plate theoryCoal pressure monitoring 

分 类 号：TD323[矿业工程—矿井建设]