SCIENTIFIC RESEARCH ON SEISMIC EFFECT OF EXPLOSION AT UNDERGROUND GAS PIPELINE OF HIGH PRESSURE

Abstract

The scientific relevance of the study on seismic effect of the explosion is determined by the heterogeneity of the real mountain mass and the corresponding difficult predictability of the propagation of vibrations in one direction or in another at different distances. The significant uncertainty of the initial conditions of distribution and limitations in the means of monitoring the process do not allow transferring these works from scientific to the category of research regulated by the state standard. Therefore, when there is a question of safe execution of explosive works near especially protected object, it is always rational to carry out the corresponding scientific work. The article presents the results of the study of the permissible dynamic load on the area of the high-pressure gas pipeline of the II category, located within the boundaries of the mining branch, in connection with the blasting works at the quarry of JSC "Sukholozhsktsement". The work aims improving the level of safety of operation the gas pipeline and establishing the restrictions on the seismic effects of mining (blasting) works in the direction of the gas pipeline installation. The technique of IM UB RAS is applied to determine the permissible distances from the technological explosion in the quarry up to the protected object (gas pipeline), depending on the mass of explosives in the deceleration stage, the coefficient of soil conditions and the permissible speed of seismic oscillations. We note that depending on the depth of the explosion in the quarry and the corresponding geological data, by changing the mass in the deceleration stage, it is possible to eliminate completely the negative impact of the explosion on the area of laying the gas pipeline. A calculation scheme also propose to determine the safe distances to the high-pressure gas pipeline depending on the angle of the board and the
depth of blasting in the quarry. We have performed the dynamic calculation analysis of the force impact of blasting on soils or rocks and high-pressure gas pipeline. It is recommended to establish restrictions on the mass of explosives at the level of minimum dangerous values, and, for the upcoming explosions, to design a scheme of initiation of charges with a
mass of explosives, in the deceleration stage, less than 1(one) ton.