Abstract:

CRD method and roof ripping method are proposed for the construction of the junction section between the access tunnel and the main tunnel. The two methods proposed are compared in terms of technical measures and construction process. Finally, roof ripping method is adopted, with the geological prospecting data, the actual geological conditions and the safety, quality and schedule requirements considered. In the end, the construction of the junction section has been completed with high quality and high speed. The paper can provide reference for similar projects in the future.

Key words: tunnel excavation, junction section, CRD method, roof ripping method