浅埋偏压连拱隧道中墙优化分析

浅埋偏压连拱隧道中墙型式直接关系到隧道工程施工及正常运营,本文采用有限元数值方法对不同中墙型式下偏压连拱隧道结构受力特征作了计算分析,偏压连拱隧道采用复合曲中墙结构将有助于改善中墙受力状况,减小应力集中及上部位移,降低衬砌开裂渗水的可能性,从而为偏压连拱隧道合理设计提供理论根据。

Optimal analysis of mid-board of shallow double-arch tunnels under unsymmetrical pressure

The FEM was used to calculate and analyze the bearing character of shallow double-arch tunnel with different mid-boards under unsymmetrical pressure. The unsymmetrically pressed shallow double-arch tunnels which adopted multiple bent mid-board would be helpful to improve the bearing character of the mid-board and to decrease the concentration of stress and the displacement of the up mid-board. Ultimately the adoption of the multiple bent mid-board could lower the possibility of cracking of mid-board. Therefore a theoretical basis to design unsymmetrically pressed shallow double-arch tunnels was provided.