The detonating delay time of millisecond blasting is an important parameter during shaft excavation by one-step deep-hole blasting. If detonating delay time and detonating sequences are reasonable

the millisecond blasting technology has many advantages. The foregoing blasting can create free face and compensating space for the following blasting to achieve the purpose of layered and segmented blasting. Also

the vibration damage of the surrounding rock can be reduced by decreasing detonated explosive charges in every turn. Based on deep-hole millisecond blasting theory

calculation methods of the detonating delay time of presplitting blasting

cut blasting

the same segmentation auxiliary holes blasting and the adjacent segmentation auxiliary holes blasting of shaft excavation by one-step deep-hole blasting are studied. In addition

six kinds of detonating sequences are put forward

such as bottom-up presplitting blasting

up and down before the middle smooth blasting

etc. The one-step deep-hole blasting technique is seen to meet the requirements in the Huaheng coal mine which proves that this research is applicable to other similar projects.