Study on Blasting Scheme of Adit Excavation in Open-pit Mine under Complex Environment
There are expressways,county roads,residential areas,ultra-high-voltage lines along the outer adit of Xiyu Open-pit Mine.The construction environment is complex,and the harmful effects of blast-ing need to be strictly controlled.According to the background of adit engineering,the millisecond con-trolled blasting scheme is designed.Combined with engineering practice and empirical formula,the explo-sive unit consumption,hole spacing,charge length,delay time,charge structure and detonation network of full-face excavation blasting of Grade Ⅳ surrounding rock and Grade Ⅴ surrounding rock are determined re-spectively.The safety distance of blasting vibration,the safety distance of blasting air shock wave and the maximum distance of blasting flying rock are calculated respectively.The prevention and control measures of blasting vibration,air shock wave,blasting flying rock,toxic and harmful gas,dust and blasting noise are put forward.The results show that the blasting flying stone has a certain influence on the Minjiayuan Bridge and the county road,and it is necessary to adopt the scaffold with the bamboo sheet to block the flying stone.
blasting in complex environmentadit excavationblast vibration
万方数据
维普
