Fang Yuchao, Ni Dingyu, Cai Feng, Lu Shengliang, Weng Zhenqi
College of Civil Engineering, Zhejiang University of Technology, Hangzhou, China.
Wenzhou Polytechnic, Wenzhou, China.
Heliyon. 2024 Mar 4;10(5):e27394. doi: 10.1016/j.heliyon.2024.e27394. eCollection 2024 Mar 15.
The development of subway and highway tunnels has led to the spatial intersection of tunnels, significantly impacting tunnel deformation, lining stress, and ground settlement during construction. To study the influence of critical parameters such as the cross angle and centre-to-centre distance on the tunnel performance, a series of numerical simulations were carried out. The influence range and magnitude of stress in the spatial cross tunnel under different cross angles were determined. The results indicated that as the crossing angle increased, the stress on the lining decreased, and the vault displacement increased. Meanwhile, the parallel tunnels showed opposite tendencies. Based on these results, the crossing angle of the cross tunnels was suggested to be greater than 45°. Parallel tunnels should be considered individually because the loading is symmetrically distributed. Considering the vault displacement and von Mises stress of the lining, it is recommended that the tunnel spacing be greater than 2D. The numerical model was validated against field data, and the findings of this study can be useful in designing cross tunnels.
地铁和公路隧道的发展导致了隧道的空间交叉，对施工期间的隧道变形、衬砌应力和地面沉降产生了重大影响。为了研究诸如交叉角度和中心距等关键参数对隧道性能的影响，进行了一系列数值模拟。确定了不同交叉角度下空间交叉隧道内应力的影响范围和大小。结果表明，随着交叉角度的增加，衬砌上的应力减小，拱顶位移增大。同时，平行隧道呈现相反的趋势。基于这些结果，建议交叉隧道的交叉角度大于45°。由于荷载对称分布，平行隧道应单独考虑。考虑到衬砌的拱顶位移和冯·米塞斯应力，建议隧道间距大于2D。该数值模型通过现场数据进行了验证，本研究的结果可用于交叉隧道的设计。
