3Singh R N,,Porter I,Hematian J.Finite element analysis of three-way roadway junctions in longwall mining[].International Journal of Coal Geology.2001
4Hanna K,Conover D,Haramy K.Coal-mine-entry intersection behavior study[].USBureau of MinesReport of Investigations.1991
5Balachandra M B.The three-dimensional structural analysis of double-entry and single-entry coal mines.Volum Ⅰ:three-dimensional finite elernent analysis of crosscut and entry intersection of a double-entry coal mine[]..1976
6Peng S S.Roof bolting patterns at three-way entry intersections[]..1978
7Filmer A O.Journal of The South African Znstite of Mining and Metallurgy[]..1982
8R.G.Gurtunca,L,Keynote.Mining below3000 m andchallenges for the South African gold mining industry[].Proceedings of Mechanics of Jointed and Frac-tured Rock.1998