STABILITY ANALYSIS OF TUNNEL RESTING OVER A SOFT GROUND

The tunnels are artificial underground passages generally used for transporting men and materials. One of the most important discussions in the field of tunneling is settlement and stability. In recent, numerical analysis has been found effective in identifying the performance of the tunnel system. This thesis represents the numerical modeling of tunnel in soft ground using MIDAS software. One of the major objectives of tunnel analysis is to figure out the stability of the given design. Apart from this, a comprehensive analysis of stresses induced in the shotcrete and rock bolt are also carried out. Ground characteristics values, ground initial stresses as well as support characteristics value are the input data's for the study. After the excavation of the tunnel body, the installation of primary supports is performed and at last the stage of shotcrete hardening is analyzed. The initial stresses has a major influence on the tunnel behavior, since stability evaluation of tunnel is conducted by changing the Coefficient of lateral earth pressure. Lastly, behavior of tunnel due to the presence of structures near tunnel is also evaluated.