Abstract: Aiming at the problems of low collaboration efficiency, frequent design conflicts, and poor construction predictability in the traditional management mode of open-cut tunnel projects, this paper proposed a comprehensive application method of BIM technology for the construction stage, with the purpose of improving the level of refined management during construction. Taking the Linjiang Avenue (Yuzhuwan Tunnel) project as a practical case, integrated applications were systematically carried out, including dynamic optimization of construction site layout, comprehensive multi-disciplinary clash detection, 4D visualization simulation of key construction processes, and dynamic progress control. The engineering application results demonstrate that, by constructing a full-discipline parametric BIM model for the 1030 m tunnel section, systematic collision detection was carried out by zone, segment, and layer. This approach systematically eliminated spatial conflicts among structures, supports, pipelines, and ancillary facilities prior to construction, achieving proactive risk control of design changes and rework during the construction phase. Through multi-stage dynamic layout simulations of the 1.55 km project-wide construction site, as well as visualized construction simulations of critical processes—including the double cofferdam construction for the 183 m crossing section of the Jiushachong River, the construction of the intersection node with a minimum clear distance of 0.567 m crossing the Yuzhu Tunnel, structural waterproofing in high groundwater level environments, and the full-sequence operation of the formwork jumbo—the feasibility of the construction scheme was pre-validated, and the allocation of construction resources was refined. This enabled the intensive utilization of spatial resources in confined areas and the scientific coordination of complex processes. Furthermore, a 4D progress management system, established by integrating the full-section BIM model of the tunnel with the construction schedule, facilitated real-time comparison between planned and actual progress, dynamic deviation correction, and precise control over process logic. This comprehensive BIM-based application method provides a replicable technical paradigm and practical reference for the digital construction and refined management of similar municipal tunnel projects.