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.
Highlights
IntroductionNick monitored the damage of adjacent roadway surrounding rock affected by vibration shock wave in the process of excavation and blasting in coal mine roadway [11]
Due to the fact that deep vertical shaft ingate is located at the throat site of mine, possessing the characteristics of large section, complex structure and intensive layout of surrounding roadway chambers [1, 2], ingate surrounding rock bears the most serious effect by vibration load produced in the process of excavation and blasting under entire construction of mine roadway and chamber, making deep vertical shaft ingate almost without exception needs secondary repair, the repair work will become a new disturbance source, which is very unfavorable for control of surrounding rock stability
Xu Tao et al has carried on surrounding rock deformation monitoring and provided reinforcement design of supporting structure based on the monitoring results of ingate, it has avoided vertical kilometer deep ingate is in disturbance under blasting construction for many times, which may cause the instability of ingate surrounding rock [4]
Summary
Nick monitored the damage of adjacent roadway surrounding rock affected by vibration shock wave in the process of excavation and blasting in coal mine roadway [11] It has not yet found the instance of damage monitoring on ingate rock mass under blasting vibration, the reason is mainly due to the special geographical location of ingate, which has important contact channels, it is a must for underground personnel, materials and large excavation equipment transported to the working face through ingate, this brought great inconvenience to the field monitoring, at the same time the ingate section is usually in 10-15 meters height, which limited the spendable tools in coal mine, this brought huge inconvenience to the test point arrangement. The research achievements of this paper has been successfully applied to practical engineering, the monitoring results of ingate surrounding rock deformation shows that optimization design of the ingate can maintain good integrity, making no difference in the downhole safety construction, having provided a guarantee for safety production in coal mine
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