关键词: 深大立井, 冻结法, 冻土爆破, 快速施工

Abstract: Based on the West Ventilation Shaft Project of Zhaogu No.2 Mine, the rapid excavation and masonry construction technology of ultra-deep topsoil freezing blasting is elaborated from the aspects of freezing scheme design, drilling and blasting construction, mucking and hoisting, waste stone exhausting, shaft wall pouring, construction organization and monitoring measurement. The multi-circle freezing tubes are used to freeze the deep topsoil to realize the dynamic regulation of freezing temperature under different geological conditions, and provide the most suitable frozen soil conditions for blasting. The rapid progress and good blasting effect are realized by continuously optimizing blasting scheme, assisted by vibration velocity monitoring. According to the earth pressure and the stress of the engineering structure, the concrete strength grade is adjusted in time to ensure the stability of the shaft. The shortest construction time and optimal economic benefit is implemented by adopting the project management method and taking the premise of engineering safety quality. The construction time will reach the optimal economic benefit. Rapid excavation of deep and large shaft is realized by adopting “roll work in shifts” in outer wall construction, and “three shifts” in inner wall construction. This research work can provide a certain engineering reference for the similar construction of super-deep frozen soil vertical shaft.