Influence of the diameter of pressure relief hole on explosion-proof performance of blast wall

The ANSYS/LS-DYNA finite element software was used to build a two-dimensional model of TNT explosive and blast wall with different diameters of pressure relief hole, and the response laws of the wall to the explosion shock wave were simulated, the results show that: with the increase of the diameter of pressure relief hole, the reflection overpressure in the front of the blast wall is weakened more severely, while the change of the overpressure behind the wall is not so obvious; the diameter of the pressure relief hole has little effect on the initial peak value of pressure on the wall, and the larger the diameter of pressure relief hole, the more the pressure reduction after the initial peak; the existence of the pressure relief hole greatly improves the effective stress on the blast facing surface of the wall near the hole, which has little effect on the peak effective stress.