Shock Wave Propagation Law And Research Of Protective Elimination Technology In The Subway

Subway, as the most commonly used city public transport nowadays,with its fast and without the advantage of road congestion,has been widely used in the developed cities around the world. For the subway structure is a special underground space, every year the terrorist attacks may happen in the world. Dynamite explosion is a rapid chemical reaction process with strong damage. Due to the limited space in the subway, explosion can produce infinite reflection of shock wave and this makes the effection of damage more serious. In order to reduce the subway of terrorist bombing and reduce the damage effect of explosion, the study of the subway explosion shock waves propagation law and wave elimination of explosion protection technology research is particularly important.Based on the software ANSYS/ls-dyna, the attenuation rule of the explosion shock wave in subway structure are analyzed, and concluded that the decay curve of shock wave in the subway along the length direction and transverse direction, the attenuation in the area near5m is very significant.The shock wave is spherical in the initial stage, with the increase of distance along the length direction of the subway, the spread of shock wave has the property of the planar characteristics.In response to the occur of underground explosion, the article also expounds the measures of explosion protection. In addition to the elimination technology of shock wave research, we mainly use the software to analys that the multilevel gallery tunnel can make the great reduction of the shock wave.According to test projects,we set water in the tunnel and make the test of the presure of shock wave. Analysis results show that multilevel gallery tunnel and setting water is a good way to weaken the energy of shock wave.