Finite Element Analysis of the Stability of Tunnel Surrounding Rock with Weak Rock Layer

The evaluation of local stability of the tunnel surrounding rock mass with weak rock layer is very important for the economy and security of the tunnel construction. Based on the rock tunnel geological conditions in the construction, the finite element model of the tunnel surrounding rock mass stability analysis with weak rock layer is established in the article by selecting the ABAQUS program linear D-P materials model as the gneiss yield criterion. The computation result indicates that the explicit dynamic analysis program could simulate the whole process of the instabilization and failure of the weak rock layer, and avoid the convergence existing in the general finite element computation, and the analysis model and program could offer effective measure for the analysis of local stability of the tunnel surrounding rock mass with weak rock layer.