Steel Fibre Reinforced Shotcrete Tunnel Lining Design After: Barrett and McCreath (1995) Inputs s 2 m Shape Wedge Wedge Square Block 30 ° h - m g 24 kN/m3 W 55.4 kN =B9*(IF(B6="Wedge",1/3*B5^2*B5/2/TAN(RADIANS(B7)),B8* 13.9 kN/m =B8/B5^2 0.15 2 MPa 1 MPa a 0.03 m t 0.075 m Adhesion Ca 240 kN =4*B12*B5*B13*1000 check: Ca > 1.5 * OK Flexure M 7.97 kNm =1/8*(B9*B5^2*(1+0.15)) 3.75 kNm =1/6*B11*B5*B14^2*1000 check: 0.8 * Mmax > 1.5 * M Not OK Geometry Wedge Square Block h s s Note In good ground adhesion may be relied upon. In poor ground flexural capacity mu f j weq nc fy fa Mmax f j
