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以华庄公路关山隧道为研究对象,通过建立大型三维有限元模型,采用一种人工构成的短时间正弦扫描Johnson/Epstein地震记录进行地震动力分析。该记录具有在较短时程内包含较大的实际地震频率范围的特点,从而减小计算分析的持续时间。通过对3种工况(不设置抗震缝、设置2条和3条抗震缝)计算,结果表明:关山隧道衬砌结构的动力响应以横向的受力特征为主,拱顶处横向加速度和横向位移最大,仰拱及拱底处横向加速度峰值和横向位移峰值较小,设置3条抗震缝时的围岩体位移和应力明显优于其他工况,该设计方案能满足8度区抗震要求。
Taking the Guanshan Tunnel Guanshan Tunnel as the research object, a large-scale three-dimensional finite element model was constructed and a manually constructed short-time sinusoidal scanning Johnson / Epstein seismic record was used for seismic dynamic analysis. This record has the characteristic of including a larger actual seismic frequency range in a shorter time span, thereby reducing the duration of computational analysis. The results show that the dynamic response of the tunnel lining in Guanshan Tunnel is mainly transverse, and the lateral acceleration and lateral displacement at the vault are mainly calculated by the calculation of the three conditions (no anti-seismic seam, no two anti-seismic seams and no more than three anti-seismic seams) The peak value of lateral acceleration peak and lateral displacement at the maximum, invert arch and arch bottom are small. The displacements and stresses of surrounding rock mass when three seismic seams are set are obviously better than other working conditions. The design scheme can meet the seismic requirements of 8 degree area.