The effect of blasting on a high-pressure gas pipeline located within the borders of a mine take

Abstract

Introduction. This article shows the results of investigating the allowable dynamic load on the II category high-pressure gas pipeline installation site located within the borders of a mine take, which is connected with blasting at SLK Cement open pit. Research aim. The research is aimed at increasing the level of secure operation of a gas pipeline and establishing restrictions in the seismic impact of mining (blasting) towards the gas pipeline installation site. Methodology. The methods of IM UB RAS has been applied concerning the determination of allowable distances from a blast in the open pit to the secure facility (gas pipeline) depending on the mass of the explosive at the timing stage, soil condition coefficient, and the allowable speed of seismic vibrations. Results. It has been determined that taking into account the depth of blast in the open pit and corresponding geological conditions, by means of changing mass at the timing stage, it is possible to totally eliminate the negative impact of a blast on a gas pipeline installation site. A design scheme has been proposed to determine secure distances to the high-pressure gas pipeline depending on the angle of open pit slope and the depth of blasting in the open pit. Summary. A dynamic design analysis has been carried out of blasting force action on soil and highpressure gas pipeline. It has been recommended to establish some restrictions in explosive mass at the level of minimum hazardous values. And for the future blasts it is also recommended to design a charge initiation scheme with explosive mass of less than one ton at the timing stage.