Discussion on the Calculation and Analytic Method of the Surrounding Rock of Tunnel on the ADINA

Space of surrounding rock pressure is caused by underground excavation surrounding rock mass and the supporting force of deformation or destruction. Weight model, reduction weight model, tunnel specification and finite element model are four commonly surrounding rock pressure calculation methods. This paper put forward a more reasonable tunnel surrounding rock pressure calculation model by using the finite element analysis software, numerical simulation of tunnel excavation and comparison and analysis of the four calculations' results. Tunnel surrounding rock pressure is the main load which acts on the support and lining, so correct estimation of surrounding rock pressure will be directly related to the support and the rationality of the design of lining structure, helping to ensure that the tunnel construction and safety operation smoothly. Generally speaking, the tunnel support design's priority is the size of the surrounding rock pressure, whose main performance is the size of the vertical load. Effects around the tunnel on the load and complex correlation exist between the medium state([1]). Tunnel buried depth and surrounding rock are different, besides, the size of the surrounding rock pressure is different I. Combined with specific engineering practice, this paper studies shallow soil tunnel surrounding rock pressure calculation theory of adaptability by using two dimensional finite element numerical simulation calculation on surrounding rock stress.