Research On Blasting Parameter Of Overlying Rock Bench In AnJialing Open-pit Mine Goaf

AnJialing open-pit mine is one of the largest open-pit coal mines by our country design,development and construction in Pingshuo.Due to the buried depth of coal seam is relatively shallow,Small coal mining has a long history.and there is five small coal mines on the advancing direction of the first mining area in Open-pit mine,such as Houdong,BaiXigou,HuoJiayao;Non-standard mining and mining technology of small mines,left many irregular open-pit area in mined-out area,the distribution form and properties to be determined.Mined-out area lead to the serious security hidden dangers in open-pit mine,such as for the poisonous and harmful gas leak,the large-area collapse of mined-out area in coal spontaneous combustion,etc.,directly affect the safety of hole blasting operation,therefore,it is very necessary.of optimization research in blasting scheme of overburden of mined-out area and parameters.In this paper,according to the geological conditions of overburden in AnJialing open-pit mine and the existed loading equipments,Using of site investigation,theoretical analysis and calculation,numerical simulation method,carried on the thorough research in blasting of goaf overburden in AnJialing.On the basis of goaf blasting theory,puts forward the reasonable blasting mining process and parameters,and proposed to blasting pretreatment measures of the high temperature fire and poisonous and harmful gas of mined-out area..For both AnJialing open-pit mine goaf blasting safety provides a scientific basis,and for other mines with similar situation enterprise provides an important reference value.