| With the quickly development and utilization of underground space,the anti-seismic performance of underground constructions is being paying close attention to increasingly. Seismic design is a very important issue in the design of structures of tunnel,but it was not well developed in China.Based on the data of Leiguobulaji tunnel which is situated on the highway from Yaan to Lugu,dynamic finite element analysis was performed in this paper.The main achievements of this dissertation are described as follows:1. The type and characteristic of seismic damage to the tunnel were analyzed,the theory of design seismic of underground structure and dynamic finite element were introduced asa well.2. The effects of many factors on seismic dynamic response of tunnel, such as depth of burial, rock, lining stiffness, are numerical modeling, and rules of variation in corresponding parameters are analyzed.3. The effects of shock absorptions are analyzed by way of changing depth of grouting, and the influences of variations of depth of grouting are summarized.By the above study, the following conclusions are reached:1. With the depth of burial increased, the restriction of tunnel structure is stronger which forced by surrounding rock. The effects on seismic dynamic response of displacement and internal force of tunnel structure is decreased gradually.2. On the situation that the surrounding rock of tunnel portal is weak, the tunnel structure distortion will be biggish but internal force is not biggish.3. The variation of the tunnel lining stiffness have little influence to its seismic dynamic response,but distortion will increase with the stiffness decreased and internal force will increase with the stiffness increased,so that the tunnel lining stiffness should be limited in a appropriate scope.4. If the surrounding rock of tunnel is weak,the anti-seismic capabilities of tunnel structure will be increased by the way of reinforcing the surrounding rock with grout in a biggish range.
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