Analysis Of Structure’s Seismic Calculation Method Of Shallow Buried Tunnel Lining

This paper takes2008’Wenchuan earthquake’as background and in combination with the Ministry of Western science and technology project" seismic and damping technology research of highway tunnel construction ", also has done a lot of research of tunnel cross section aseismic calculation method at home and abroad. By numerical calculation, aseismic calculation method of shallow buried tunnel lining structure is studied.Main content of the paper consists of three parts:the relationship between horizontal seismic force of shallow buried tunnel lining structure and buried depth; mechanism of seismic load generated by soil column attached to lining structure, also all seismic loads of lining and surrounding rock; analysis of void area between the lining and surrounding rock.With this analysis, horizontal earthquake force varing with the depth of the tunnel is not a linear increase; while increases and reaches a peak at first, and then decreases to a steady value. Also at this three intensity conditions of7degree,9degree,11degree, horizontal earthquake force will have a maximum value when the buried depth of tunnel is25m. And the results of current codes are suitable only in depth in the5m~25m interval, when at low intensity (less than or equal to9degree). Transmission mechanism of top soil column additional earthquake force is clear, also with the tunnel lining structure seismic load distribution and numerical expression. By the analysis of void area between lining and surrounding rock, the void areas are mainly distributed in the spandrel and arch waist when in the seismic intensity of7,9degree, then the elastic resistance range and value of static calculation method is adjusted, so that the tunnel seismic method is more accord with reality.