岩巷硬岩层位掘进中爆破方案优化及其应用OA

To realize rapid excavation in hard rock roadways of mines,the influences of multiple factors such as charging mode,borehole layout and charge quantity on excavation advance were comprehensively considered.Multiple comparative tests were conducted by adopting blasting methods including double seven-hole hollow borehole blasting,zoned cut blasting with vertical parallel boreholes and zoned blasting for main and cut blasting in the lower bench area.The post-blasting rock throwing distance,single blasting advance and damage degree to safety facilities in the test results were measured and statistically analyzed.It was concluded that the scheme of zoned blasting for main and cut blasting in the lower bench area presented the optimal performance.An average single blasting advance of 2.0 meters was achieved,with the average rock throwing distance of 10.4 meters on the left side and 21.5 meters on the right side.This scheme possessed the shortest rock throwing distance and the slightest damage to facilities.The above technology was proved to be applicable and popularized in the excavation of developing main roadways with similar geological conditions.