4Robeson E C.Experimental study of the strength of rocks[J].Bull Geol Soc Am,1995,66:1275-1314.
5Hatzor Y H,Palchik V.The influence of grain size and porosity on crack initiation stress and critical flaw length in dolomites[J].Int J Rock Mech Min Sci & Geomech Abstr,1997,34(5):805-816.
6Dreyer W.The science of rock mechanics.Part Ⅰ[C]// The strength properties of rocks,2nd ed.Series on rock and soil mechanics,vol.1(1971/1973),No.2.Clausthal:Trans Tech Publications,1973:500.
7Fahy M P,Guccione M J.Estimating the strength of sandstone using petrographic thin section data[J].Bull Int Assoc Eng Geol,1979,16(4):467-485.
8Meng Zhaoping,Peng Suping,Li Guoqing.Influence of Lithological Characters of Coal Bearing Formation on the Coal Roof Stability[J].Journal of China University of Mining & Technology,2003,13(1):1-6.