Research On The Propagation Law And Damage Effect Of Air Shock Wave In Large Underground Blasting

According to relevant tests and accidents,the damage of the air shock wave caused by the explosion is far greater than that of other blasting products.Not only will the explosion wave destroy buildings(structures)and equipment within a certain range of explosion area,but also it will cause unexpected casualty around the working area.Unlike explosion in the air,in the confined space of the underground,the blast air shock wave will be influenced by internal constraints and comprehensive factors of tunnel structures,producing complex phenomenon,such as reflection,diffraction and superposition,which indicates that the propagation law of the blast air shock wave is far more complicated than the propagation in the free field ground.Therefore,this paper studies the propagation rule of blast air shock wave in underworkings through the combination of theoretical analysis,underground tunnel by combining theoretical analysis,field experiments and numerical simulation.Firstly,it introduces related theories and research status of blast air shock wave.Moreover,based on results of the theoretical analysis and numerical simulation,it obtains the peak overpressure prediction optimization formulation of blast air shock wave through field measured data.Secondly,it gets the propagation law of blast air shock wave in many types of tunnels,such as straight tunnel,turning tunnel,fork tunnel and variable crosssection tunnel.In addition,it gets shock wave disturbance range and peak overpressure attenuation coefficient corresponding to different conditions.Finally,on the basis of previous research results,it gives the corresponding safety distance reference value between blasting network and operators.