Study On The Seismic Behavior And Design Method Of Highway Mountain Tunnel

At present,China on mountain highway tunnel relevant provisions of seismic design method is to follow the railway study design,the use of static method to checking the seismic strength and stability of the tunnel structure.Dynamic time history analysis to calculate high accuracy,but the analysis process is more complex and long time-consuming long.It is necessary to study the seismic design simplified calculation methods.Static elastoplastic analysis method(Pushover analysis method)is the seismic analysis of a simplified calculation method,with good accuracy and reliability;it has been widely applied to the ground buildings with the bridge structure,and less in applied research of underground structures.Based on Pushover method to study mountain tunnel simplifies the design seismic analysis method theoretical and practical significance.Taking a mountain tunnel engineering background,the establishment of a mountain-Tunnel-dynamic finite element model of the overall structure of the interaction between the foundation,when elastoplastic dynamic history analysis method to analyze the seismic response of mountain tunnels,mountain tunnels proposed seismic analysis Pushover analysis contrast method,and standard design method and time history method,discussed a simplified method for seismic design of mountain tunnels.In this paper,the result of work and corresponding follows:1.The 1D time-domain finite element method is realized by compiling Matlab program.Base on equivalent load method and equivalent viscous-spring artificial boundary elements;2D models under spatially uniform seismic ground motion are realized.The availability of finite element model with inputting waves is proved.2.The establishment of a two-dimensional finite element model of mountain highway tunnel structure,analyzed in a different country rock mountain tunnel structure levels,different depth,different slope gradient,different input earthquake affected different seismic waves affect the input area on the structural response of the tunnel under earthquake discuss the seismic response laws mountain tunnel structure.3.Will regulate the calculated values and dynamic time-history method of calculation values were compared,the establishment of a mountain tunnel finite element static model,using different loading patterns analysis,Pushover method to study the mountain tunnel,while the calculated results and the elastoplastic dynamic time history analysis results were compared to verify the reliability of the mountain tunnel structure Pushover analysis method,we discussed the applicability of Pushover analysis,carried out seismic performance evaluation,and proposed a simplified method based seismic design method of flow Pushover.