Abstract:Through ANSYS/LS-DYNA dynamic finite element software, the coupling model of soil mass and underground three-compartment comprehensive pipe gallery was established, and the analytical method of implicit and explicit sequential solution was adopted to simulate the implosion of gas tank at 1kg, 5kg, 20kg and 40kgTNT.The research results show that: (1) the explosive quantity has the most significant impact on the gas tank, followed by the integrated tank, the power tank has the least impact, the damage of the left partition wall in the gas tank is more serious than other wallboard damage, the damage is the wallboard joint and the middle of the board near the position.(2) in the process of propagation, the overpressure peak of the shock wave on the air Central Line in the gas tank first decreases, then increases and finally decreases. When the explosive amount is 20kg and 40kgTNT, the overpressure peak will fluctuate within 2-5m.(3) the displacement time history curve basically follows the increase with the increase of the explosive amount, and the second half time history of some measuring points will show great difference.Under the explosive load of 40kgTNT, the displacement of the upper roof of the gas tank has a greater impact than that of the lower floor, with its maximum value reaching 0.7cm and residual deformation around 0.5cm.