Study On The Influence Elements Of Seismic Dynamic Response Of Portal Of Mountain Tunnel In High Intensity Seismic Zone

At present, of the tunnel project, our country has became the most, the most complicated and the fastest growing country. As the west development strategy has been deepened, a lot of tunnel will be build in the mountains of western of our country. Includes a number of building the railway tunnel. The long and large tunnel has large section and maximum length, through the complex and bad geological the bad area, close to or over the seismic activity fault zone. Especially in western China construction area belong to high intensity of potentially zones, the possibility of earthquake. Because seismic inexperienced, the standard aseismatic design is not perfect. It is urgent to related research.The mountain tunnel is not well in defense earthquake in shallow buried department, bias department, and the hole department. This thesis select topics of mountains tunnel hole section of the seismic dynamic response. Combining the hole section engineering examples in Taiping Tunnel of CHENGLAN LINE, to do finite element analysis. The major aspects content:1. With project examples of both sides hole of the Taiping Tunnel, establish the tunnel model of hole section in one side. Using FLAC3D for finite difference computation, input the three direction qingping wenchuan wave for dynamical analysis, reach the current engineering structure seismic dynamic response characteristics.2. According to the proposed a selection of three sections form (double horseshoe-shaped section, double circular cross section, spiraling circular cross section) to do dynamic response characteristics to choose. Through the case comparing figure, to put forward in high-amplitude zones, the most appropriate chooses tunnel profile form.3. Establish the hole section tunnel model of another side (bias), comparison the earthquake dynamic response on both sides of hole structure. Find the weight of the danger area of the tunnel structure.pressure how to reinforce on the danger area.The results of this paper that mountain tunnel hole section about seismic-resistance aspects are a weak link within range of 100m, need to design to strengthenneed. And to build a tunnel in high intensity seismic area, should use circular cross section. Because the seismic performance of circular crosssection is better than horseshoe-shaped sections. In the hole section has bias cases, should pay attention to the side of the seismic numerical.