Numerical simulation study on controlled blasting energy gathering hole angle around the bottom of the Boli mine
The bypass at the bottom of the central return air shaft in Boli Coal Industry is a key project to clear the congestion of the underground parking lot.In order to quickly connect the roadway and solve the problem of overcrowding in the underground parking lot,the surrounding rock of the road-way is controlled by energy gathering blasting method,reducing the repair of the roadway surrounding rock and accelerating the excavation speed of the rock roadway.Using numerical simula-tion methods,a study was conducted on the number of cracks,maximum crack length and width,crack area ratio in the direction of energy gathering and non energy gathering,and blasting vibration velocity under different energy gathering angles.The research results showed that when the energy gathering angle was 90°,the energy gathering blasting effect was optimal and met the requirements of surrounding control.Through on-site testing at the bottom of the central air shaft in Boli Coal Indus-try,it was verified that when the angle of the energy gathering hole is 90°,the effect of blasting sur-rounding rock control is better,which can reduce the repair of surrounding rock in the roadway and improve the speed of roadway excavation.
stone driftingsurrounding rockshaped charge blastingangle of energy gathering holenu-merical simulation
万方数据
维普
