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针对含初始缺陷的既有地铁隧道受邻近穿越隧道施工影响的首都地铁隧道工程背景,基于有限差分方法,通过对既有地铁车站结构受邻近隧道穿越后的抗震性能研究,揭示其抗震动力响应机理。结果表明,在邻近隧道穿越影响下,含初始缺陷的既有隧道各薄弱控制点在地震作用下位移和应力动力时程的波动趋势具有相似性,说明衬砌结构是整体运动的,其位移、应力较穿越前均有所增加,边墙和仰拱在穿越后抗震性能影响最大,剪切破坏主要以车站结构周边土体为主,新线穿越后其剪切破坏分布范围有所增大,应进行注浆加固处理,与自身结构刚度相匹配,提高抗震能力。
In view of the background of the Capital Metro Tunnel project of the existing subway tunnel affected by the construction of the adjacent tunnels with initial defects, based on the finite difference method, the seismic performance of the existing subway station structures after passing through the adjacent tunnels is revealed and the seismic response mechanism . The results show that under the influence of adjacent tunnel crossing, the displacement of each weak control point of the existing tunnel with initial defects under earthquake and the tendency of stress-dynamic time-history have similarities, indicating that the lining structure is a unitary movement with displacement and stress Compared with those before passing through, the seismic performance of the side wall and the inverted arch are the most important. The shear failure is mainly dominated by the soil around the station structure. After the new line crosses, the shear failure distribution increases Grouting reinforcement treatment, with its own structural rigidity to match, improve seismic capacity.