Abstract
In this study, under the open-close conditions of a roadway outlet, ANSYS/LS-DYNA was used to build models of explosions on roadways with 0° and 90° bending angles, to compare and analyze the shock wave propagation characteristics and variation laws. Combined with the damage degree classification of shock wave overpressure to human body, the destructive effect zoning of explosion in roadway under the condition of opening and closing of roadway entrance was studied. The results showed that as the bending angle increased, the peak overpressure attenuation of the shock waves became prominent, and the arrival time for the same distance increased. The closure of the roadway outlet had a distance effect on the peak overpressure of the shock waves. The explosion shock waves caused the peak overpressure to rise sharply owing to the reflection and stacking effects near the closure. In the far zone of the outlet, the attenuation of the shock waves was too fast and had minimal impact on the peak overpressure. In addition, the existence of the roadway closure increased the damage area and the severity of the blast wave to human body as a whole. With an increase in the bending angle, the damage range and severity decreased.
Highlights
An underground roadway is a typical underground confined space, where the characteristics of dynamite explosions differ greatly from those in an open space
Dadone et al [1] performed five types of tunnel experiments to study the pressure attenuation of shock waves passing through interaction points. e results showed that the pressure attenuation of shock waves at the interaction points could neglect the tunnel size effect. e calculation of the shock wave pressure changes near the interaction points, based on the steady flow pressure model, presented large errors
Savenk [2] studied the propagation characteristics and shock waves laws based on a model experiment. e attenuation coefficients of the shock waves passing through the local variation in bifurcation and turning were obtained
Summary
An underground roadway is a typical underground confined space, where the characteristics of dynamite explosions differ greatly from those in an open space. Zhang et al [21, 22] used numerical simulation to study the explosion shock waves’ peak pressure distribution when passing a 20°, 45°, 90°, and 135° oneway turning roadway and revealed the influences of roadway geometry on the shock wave propagation laws. E results of previous studies showed that the research mainly focused on revealing the propagation law of air shock wave generated by explosives detonation in a small range, and the research mainly focused on straight roadways. Is paper builds, through numerical simulation, and based on the roadway outlet’s open-close conditions, respectively, models to analyze explosions in a roadway with 0° and 90° bending angles. A nonlinear dynamic analysis finite element program called ANSYS/LS-DYNA was used to conduct a numerical simulation to study the open-close conditions of the influence of different turning roadway outlets on the explosion shock wave propagation characteristics.
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