results and discussion

A three-dimensional numerical study of the response of underground rock tunnel subjected to internal blast loading has been analyzed. The tunnel has 6m of diameter and 30m x 30m x 35m of rock model surrounding the tunnel. Four different thickness of tunnel lining considered in the present study is 0.22m, 0.35m, 0.45m and 0.55m. The mass of TNT explosive for the present paper is 10kg, 20kg, 30kg, 40kg, 50kg and 60kg. The analysis has been carried out for four different cases of depth of overburden, i.e., 5m, 7.5m, 10m and 12.5m. The Mohr-Coulomb material model has been adopted for rock and Concrete Damage Plasticity Model has been used for tunnel lining. The TNT explosive has been modeled using JWL material model. Further, the present study incorporates CEL modelling for simulating the blast loading event. Following results have been found out and were discussed.