1. G.L. Liang,W. Y . Xu,Y.Z. Yu, et al: Rock and Soil Mechanics. Vol. 29(2008),P. 849. (In Chinese).
2. X.H. XU,Y.Q. S,H.Y. S: Journal of Mountain Science. Vol. 28(2010),P. 161. (In Chinese).
3. Q.Y. Zhang, X.P. Chen D.W. Liu, et al: Rock and Soil Mechanics. Vol. 3(2009),P. 362. (In Chinese).
4. Y.D. Meng W.Y. Xu,B. T, et al: Journal of China Three Gorges University (NaturalSciences), Vol. 31(2009),P. 20. (In Chinese).
5. M.C. He: Chinese Journal of Rock Mechanics and Engineering. Vol. 28(2009),P. 1081. (In Chinese).