Numerical Simulation on Destruction Process of Ventilation Door by Gas Explosion

Abstract

Abstract After gas explosion in an underground space such as a coal mine and tunnel, the shock wave and flame wave will destroy the ventilation structures, the destruction of ventilation door may lead to failure of ventilation function of the underground ventilation system. Therefore, this study used ANSYS (LS-DYNA) software to establish the mathematical and physical model of the ventilation door impacted by gas explosion, the destruction was numerically simulated from the displacement (displacement nephogram and displacement-time-history curve), equivalent stress (equivalent stress nephogram and stress-time-history curve of the ventilation door) and equivalent strain of the ventilation doors with five kinds of different thicknesses. The results showed that the displacement of the unit body on the ventilation door increases with the action time, and the displacement curve is exponential. The displacement nephogram increases gradually from the edge to the center, and develops symmetrically; the displacement nephogram in central region decreases gradually. Finally, nephograms with some regular shape appear. The stress of the whole ventilation door increases with the action time. The larger stress region extends to the central region, the stress near the edge is the largest; the strain increases with time. The stress on the unit body first increases and then decreases, finally, the stress on the unit body basically approaches a steady value. When the impact pressure is constant and thickness of the ventilation door is little, the ventilation door can be instantaneously destroyed, but the deformation is smaller. However, as the thickness of the ventilation door increases, the impact pressure does not destroy the ventilation door, but the deformation of the unit body is large. The stress of the unit body of the ventilation door decreases first, then increases, finally, stress decreases. The research results can guide the material selection and structure improvement of the ventilation door.