Stability Analysis of Different shapes of Tunnel in Cohensionless Soils

Abstract One of the crucial factors that has gained widespread popularity during tunnelling construction process is face stability tunnel mainly depends upon support pressure to be applied at against overburden and surcharge loading acting on earth surface. In this study, different cross sections tunnels been investigated in cohesionless soil (loose medium dense sand) using Finite Element Analysis software Plaxis 2D V20. Tunnel having sectional dimension B as width, D height positioned a depth H from surface ground. Due tunnel, suitable uniform compressive periphery form lining or anchorage system collapse. Variation deflection presented for combinations H/D Ф (angle internal friction soil), thickness. It observed particular thickness with increase H/D, displacement crown increases could resisted by increasing The circular was less compared semi-circular square tunnel.