APPLICATION OF LONG-HOLE LOOSE CONTROLLED BLASTING TECHNIQUE IN EXCAVATING CONSEQUENT BED CUTTING SLOPE

It is introduced that the application of long hole loose blasting technique in excavating unstable rock bedding slope under the complicated environment at the Chongqing～Huaihua Railway.According to the characteristics and environment of this engineering project,through optimum seeking appreciative parameters of loose blasting and slope smooth blasting,loading method,using a blasting network of in-hole and out-hold millisecond delay,choosing the directions of minimum burden and loose blasting,controlling every delayed detonating change and taking effective safety measures,the blasted flying rocks and blasting vibration have been controlled successfully.