依托尖峰连拱隧道工程,运用FLAC3D数值软件对管棚超前支护受力特性及加固效果进行分析。研究结果表明管棚结构的纵向受力为掌子面前方为受拉段,掌子面后方为受压段;管棚纵向拉力峰值随隧道覆土荷载的增加呈现先增大而后有一定程度的减小,管棚中间段拉力峰值达到最大;隧道拱顶和拱腰部位的管棚受力较大,而边墙部位管棚的受力最小。管棚超前加固区域围岩塑性区径向分布及掌子面前方围岩塑性区分布范围均较小。 Based on the spire multi-arch tunnel project, FLAC3D numerical software is used to analyze the stress characteristics and reinforcement effect of advanced support in pipe shed. The results show that the longitudinal force of the pipe shed structure is that the front of the face of the pipe is the tensioned section and the rear of the facet of the pipe is the pressure-bearing section. The longitudinal tension peak value of the pipe roof firstly increases and then decreases to a certain extent with the increase of the tunnel covering load Small, the middle section of pipe shed peak tension peaked; tunnel vault and arched waist pipe shed force greater, while the wall part of the pipe shed the least force. The radial distribution of the plastic zone of surrounding rock and the plastic zone of surrounding rock in front of the face of the pipe roof are smaller in the area with advanced reinforcement.