Abstract:The new Dayaoshan tunnel is the longest ultra-large cross-section tunnel in our country’s railway passenger transportation special line construction. It passes through complex stratum and has high construction requests. Its design speed reaches as high as 350 km/h. In order to guarantee the tine limit for the project and the construction quality, the rapid construction technology by whole section smooth blasting in a better adjacent formation land sector is used. Combing rock types and construction condition, a certain number of field tests without affecting the normal construction are carried out. The demolition parameter, power-charging structure and the initiation network of the Dayaoshan tunnel excavation are detailedly analyzed and designed. The reasonable quality safeguard and safety measures on drilling and blasting construction and management are put forward. Through using of PVC half-tube continuously non-coupling charging structure, the purpose of reducing the excavation cost and enhancing the blasting effect has achieved.