Conclusion
The present study for internal blast loading of Quartzite rock tunnel
using CEL model for simulating the TNT blast in Abaqus/Explicit has been
carried out. The significant conclusions observed from this study are as
follows.
Deep tunnel has been found to be more blast resistant than shallow
tunnel. The effect of increase in explosive mass has been quite obvious.
However, it has been noticed that this effect is more significant in
shallow tunnel rather than deep tunnel. The thickness of tunnel liner
plays important role in blast resisting but up to a limit only. Further,
increase in thickness will make the section uneconomic and heavier,
however, enhance in the blast resistance will not significant. Hence,
under any proposed depth of tunnel a study should be carried out for
optimum thickness of blast resistant tunnel.