The surrounding conditions of tunnel lining may be changed during the investment period, which lead to a redistribution of forces acting on the tunnel lining, and perhaps generate new forces that are not taken into account during the design. In this paper, a case study of Alsafkon tunnel is regarded, which is one of the Syrian Railway deep tunnels. The lining of this tunnel suffers from cracks, leakage, and other defects. The results of numerical analysis are conformed to the current situation of the tunnel in terms of distributed cracks places in the concrete lining. The study showed also the importance of improving the lens properties to avoid the total fall down of the tunnel.
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