电力电缆隧道稳定性分析

Stability analysis of power cable tunnel

电力隧道中隧道底板和衬砌稳定是影响隧道安全的关键性问题,利用SAP84结构分析软件,对隧道在水压力作用下的稳定性进行分析。研究结果表明在水压力作用下遂道变形规律为:边墙中部向隧道内部凸出,使边墙呈现拱形型式,底板中部向隧道内部凸出;水压力作用下,拱顶处内侧受拉,拱顶两端外侧受拉,边墙脚外侧受拉,仰拱两端内侧受拉;剪力在底板两端最大;随着水压力的增大,隧道各截面承受的轴力也逐渐增大,轴力在边墙与仰拱交界处最大,由仰拱底部到拱顶,轴力逐渐减小。研究结论与实际工程中隧道的变形规律一致,可以为隧道加固设计提供一定参考。

Stability of tunnel floor and lining in power tunnel is a key problem affecting tunnel safety. SAP84 struc- tural analysis software is mainly used, to analyze the stability of the tunnel under water pressure. The results show that under the action of water pressure, the deformation shows the following features： the middle part of the side wall protrudes toward the tunnel, so that the side wall shows the arched type and the middle of the floor protrudes toward the tunnel; under the action of water pressure, the inner side of vault, the outer side of the vault at both ends of the pull, the side wall of the foot and the inside of the arch at both ends are pulled ; shear force at both ends of the floor is maximum ; With the increase of water pressure, the axial force of each section of the tunnel is gradu- ally increased. The axial force is maximum at the boundary between the side wall and the invert, and the axial force decreases gradually from the bottom of the arch. The conclusion of the study is consistent with the deformation law of the tunnel in the actual project, which can provide some references for the tunnel reinforcement design.