6DAIGIC S.Influence of Weak Rocks on Excavation and Support of the Beykoz Tunnel, Turkey [ J ] . Engineering Geology, 2000, 58 (2): 137-148.
7JENG F S, WENG M C, HUANG T H, et al. Deformational Characteristics of Weak Sandstone and Impact to Tunnel Deformarion [J] .Tunnelling and Underground Space Technology, 2032, 17 (3) : 263 - 274.
8HSU S C, CHIANG S S, LAI Junren. Failure Mechanisms of Tunnels in Weak Rock with Interbedded Structures [ J ] . International Journal of Rock Mechanics and Mining Sciences, 2004, 41 (3): 1-6.