Safety Construction Technology of Controlled Blasting in Expanding Cut in Existing Electrified Railway

摘要

The blasting construction of expanding cut in existing electrified railway is affected by many factors such as the travelling trains, the narrow blasting space and the hard natural environment. In this paper, The controlled blasting design and construction technique of expanding cut and the safety precautions in the section of Zhuzhou -- Liupanshui railway line are introduced. The problems such as blasting parameter design and charge weight calculation on the short-hole bench are discussed. The structure and function of main safety facilities such as the steel-pipe bent and flexibility prevention system are demonstrated. The economical and safety construction method is put forward as well.