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We studied about the input parameters of supports and grounds for the tunnel design program reported in previous proceedings, 346/III-1. Creep tests of shotcrete in early stage of less than 1 week were done to decide equivalent modulus of elasticity. Tensile tests about ordinary bar and twisted bar clarified their characteristics, from which we find it appropriate to use the former for general tunnels and the latter for large deformation tunnel. Parameter studies of ground have been made comparing the measured and the calculated values of 12 tunnels, and therefrom it appears that initial lateral; coefficient Ko is strongly correlated to overburden H. Modification factor to modulus of elasticity was thus obtained for each class of ground.

STUDIES ON THE PARAMETERS OF SUPPORTS AND GROUNDS FOR THE TUNNEL DESIGN PROGRAM