Numerical simulation study on curved explosion-proof wall under the impact of coal mine gas explosion

Abstract：In order to study the influence of the radian of the gas explosion-proof wall on the shock wave in tunneling face, roadway, goaf and production isolation area, the calculation models of the arc-shape explosion-proof wall with 30, 45, 60, 75, 90 degrees of the central angle were simulated by finite element software ANSYS/LS-DYNA under the same height, charge quantity and explosion distance.The horizontal and vertical directions overpressure of the points behind the wall were measured.By comparing with the empirical formulas, the shock wave distribution of explosion-proof wall in different radius and distribution characteristic of overpressure behind the wall were obtained.The results showed that: (1) Compared with the straight-wall explosion-proof structures, the arc-shaped explosion-proof wall had a better reduction effect when being subjected to explosive shock wave; (2) According to the distribution characteristics, the pressure at each measuring point increased first and then decreased, the peak pressure at different measuring points was affected by the distance between the wall and the ground; (3) Compared with other radian explosion-proof walls, the 60 degree radian explosion-proof structure had better anti-explosion shock wave effect.

Keyword：coal mine gas explosion;curved explosion-proof wall;over pressure peak;ANSYS numerical simulation;