ChengGuoHua

In order to find out the reason for poor blasting effect in Huashugou mining area of Jingtieshan Mine，and satisfy the need of precision in formation of cutting groove by once middle-deep hole blasting，the tests for improving middle-deep hole drilling accuracy of Simba 1354 rig have been carried out

The pillarless sublevel caving method is currently used in Huashugou Iron Mine of Jingtieshan.The adoption of the artificial digging and cutting raise in this method causes high tunneling cost,high labor intensity,poor and dangerous working environment.In order to solve the problems of artificial