Analysis On Stress Mechanism Of Wu Shaoling Tunnel In Broken Rock

With the rapid development of the underground structure, various underground projects come out. In the course of the underground construction, deformation in rock mass will produce cranny and crack. In some conditions, underground structure lost stability. Therefore, study for stability of wall rock makes an important sense to underground structure.Because of the complexity of geological condition and underground structure, it is very difficult by using the theory analysis method to carry on the project's stability analysis and calculation. In recent years, along with the rapid development of computation mechanics, numerical methods and computer technology, the numerical simulation method has become an important tool to research on underground structure.An elastic-plastic finite element analysis model was applied to simulate the conventional procedure of tunnel excavation and lining with the finite element. By studying the effects of the parameter of lining, the mechanics of its performance are studied by researching the deformation of excavation, the force of lining and the distribution of axial force. Finally, a practical project is studied by the finite clement analysis method and the calculated results are compared with the measured results. The main research work and results are remarked as follows:The results for a practical project showed the validity of the model and the numerical method, the combination construction model composed by plan stress and beam concomitance with those parameter choose by author can worked on the stress and distortion during the tunnel excavation and lining well. The results for a practical project showed it can be used as supervise of construction. Difficulties of specific practical application, finite element analysis in tunnel construction thickness of the reinforced area selection Pretreatment Program and the test excavation program selection, and other aspects will have good references.