Stability and Deformation of Surrounding Rock in Pillarless Gob-side Entry Retaining
We analyzed the stability of the retained gob-side entry in four different Chinese coal mining sites and evaluated the influencing factors of roadway deformation such as mining depth, support strength, area of gob-side hanging roof, etc. It was found that the length of cantilever roof block above roadway has a major impact on the deformation, whereas the impact of mining depth is minor if the depth is less than 500m. Minimum support resistance of 0.3 MPa is essential to effectively confine the deformation of a retained roadway. We performed physical experiments to further study the features of roof fracturing and their impact on roadway deformation under three typical immediate roof conditions, i.e., thickimmediate roof, thin-immediate roof and non-immediate roof. In addition, equations to calculate desired support resistance of filled gob-side wall were derived based on superimposed continuous laminate model. The results provide valuable theoretical and practical guidance for implementing pillarless gobside entry retaining in engineering practices.
gob-side entry retaining surrounding rock structural stability condition deformation impact factor
ZHANG Nong YUAN Liang HAN Changliang XUE Junhua KAN Jiaguang
School of Mines, State Key Laboratory of Coal Resource and Mine Safety, China University of Mining a National Engineering Research Center for Coal Gas Control, China
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
222-231
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）