English：

Taking the reconstruction and expansion project of the Xiangshan Tunnel in Fuzhou as anexample, this paper discusses the problem of reducing urban traffic interference by adopting a flexibletraffic guidance scheme in construction. Through the detailed analysis of the existing tunnel and itssurrounding road network, a set of phased and segmented construction schemes and a two⁃period, six⁃stage dynamic traffic diversion and reform scheme are proposed. The left and right line tunnels are usedto construct and divert the traffic in turn to minimize the adverse impact of construction on urban traffic.The results indicate that the proposed traffic diversion scheme can effectively avoid traffic congestioncaused by tunnel closure construction and provide solid support for the smooth progress of the project.