Design of the underground tunnel support system in weak rock is complex in nature. The understanding of rock failure in weak rocks is difficult due to the uncertainties associated with it. Different rock mass classifications are used for the design of tunnel support systems. These classifications are based on different case studies and field observations on tunnel failures and may not be applicable for all types of rocks. Tunneling is a three-dimensional problem even though, lot of studies adopt 2D modeling. In this study, a 3D finite element analysis was performed to analyze the tunnel support in weak rock and check the validity of the empirical approach of tunnel support design such as Rock Mass Rating (RMR) and Rock mass Quality (Q-system).