6US Army Corps of Engineers. EMI 110 -2 -2901 Tunnels and Shafts in Rock [ S 1. Washington : Department of the Army, 1997.
7US Army Corps of Engineers. EMIII0 -2 -2104 Strength Design for Rein- forced Concrete Hydraulic Structures [ S ]. Washington : Department of the Ar- my, 1992.
8ACI Committee 318. ACI 318 -08 Building Code Requirements for Structural Concrete and Commentary[ S]. Michigan: American Concrete Institute, 2008.