Blasting vibration on deep shaft ingate rock damage and its control measures

Abstract

Traditional control of ingate surrounding rock is partial to repair and optimization after failure of supporting structure, and only for specific structure of ingate is studied, without considering blasting vibration effect on damage of ingate surrounding rock, and lack of study on layout design of ingate surrounding chamber group. Based on the research status of deep vertical shaft ingate, this paper has carried on theoretical analysis and field testing for ingate surrounding rock damage affected by vibration load produced in process of excavation and blasting in mine roadway and chamber, getting the change law of ingate surrounding rock damage under blasting vibration, and new control measures about loaded constitution, delay blasting technology, set isolation hole, especially the rational layout of ingate surrounding chamber group are provided, combined with numerical simulation software to determine reasonable spacing of ingate surrounding chamber group in deep vertical shaft, and optimize construction sequence. Finally, research achievements are applied to engineering practice, the results of field deformation monitoring show that ingate in mine roadway and chamber can maintain good integrity under construction process.

Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway

“…As the coal resources within shallow grounds are depleting and coal mining operations are moving to deeper grounds, approximately 60% of the coal mining works are currently conducted with a mining depth of over 800 m in China [1]. The impacts of high ground stress and weak strata are encountered within the mining operation works in deeply buried coal mines [2,3]. Roadways are prone to collapse in these adverse geological conditions, and the roadway collapse contributes to 43% fatalities of miners in underground coal mines in China [4,5].…”