Mine ventilation provides fresh air to underground workers. The dampers can provide a qualified fresh air to each demand workplace by adjusting the air volume, which can ensure workers’ health. However, the powerful impact damage caused by gas explosions in the roadway can lead to deformation and damage to the dampers and even cause the breakdown of the ventilation system. At the same time, the impact effects of gas explosions may cause worker fatalities. For this reason, the dynamic response of gas explosions to dampers and their effects need to be studied. Based on the analysis of the damper construction and the damage characteristics of the gas explosion, ANSYS/LS-DYNA software is used to establish a mathematical-physical model of the damper with ventilation-regulating windows of six different sizes. The reliability of the model is verified by comparing the simulated pressure values with the values calculated by the Sadowski equation. The dynamic response characteristics of the dampers under the gas explosion impact are simulated and the displacement, equivalent stress and effective plastic strain of the dampers are measured. Finally, a theoretical analysis is carried out. The study results show that the displacement of the damper increases gradually from the edge to the center and the deformation is symmetrical in the absence of the ventilation-regulating window. The deformation region below the ventilation-regulating window is more obvious when the ventilation-regulating window is installed. The maximum stress of the damper first appears at the four corners of the damper, the stress of the unit at this position increases with the increase of the side length of the ventilation-regulating window. The stress of the unit in the lower left corner of the ventilation-regulating window first increases and then decreases with the increase of the side length of the ventilation-regulating window, and all the stresses of the units first increase and then decrease, and finally, the stresses basically approach a stable value. From the instantaneous ignition to the completion of the final reaction, the plastic strain gradually increases, but the area of the plastic strain region gradually decreases. The damage and deformation of the damper are basically consistent with the situation of the damper in the explosion accident. The research results can provide some theoretical basis and data support for the damper structure selection, damper location selection and setting of ventilation-regulating window.
In order to investigate the influence of initial pressures on the propagation characteristics of gas explosion in roadway, the physical model of gas explosion under different initial pressures in roadway is established by the fluid-structure interaction algorithm of ANSYS/LS-DYNA. The pressure of shock wave, the rise rate of pressure and the flame propagation velocity are analyzed when the initial pressure is 0.08, 0.09, 0.10, 0.11, and 0.12 MPa, respectively. The results reveal that the maximum pressure of shock wave at the same position in the roadway increases significantly with the increase of initial pressure, which presents a quadratic function relationship. The time to reach the maximum pressure of shock wave is extended comparatively. In addition, the maximum rise rate of shock wave pressure increases with the increase of the initial pressure, which means that the explosion hazard increases. The flame propagation velocity in the roadway decreases linearly with the increase of initial pressure. When the initial pressure increases by 0.01 MPa, the flame propagation speed will decrease by 2.6%.
In order to explore the damage process and characteristics of roadway wall under the impact of gas explosion, in this paper, the numerical model of gas explosion in roadway is established, and the explosion impact response of roadway wall and the stress change of gas explosion in roadway wall are analyzed. The results show that the impact produced by gas explosion is repeatedly reflected and superimposed on the wall, resulting in the high peak overpressure and duration growth in the explosion load process formed in the roadway. The shock wave propagation of gas explosion in wall is dynamic, and will produce tensile stress and compressive stress, causing damage to the interior of the wall. It will drive the wall structure of adjacent areas to move along the action direction of explosion load, resulting in the overall instability and damage of roadway wall structure. The research results can provide reference for gas explosion disaster prevention and explosion accident identification.
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