巷道内双爆源瓦斯爆炸冲击作用特性数值模拟研究

Numerical Simulation Study on the Impact Characteristics of Gas Explosion with Dual Explosion Sources in Roadway

摘要: 为研究巷道内双爆源瓦斯爆炸冲击波对巷道壁面结构的损伤特性，利用ANSYS/LS-DYNA建立巷道双爆源瓦斯爆炸模型，对双爆源瓦斯爆炸作用下巷道内冲击波超压传播以及有效应力进行了分析，并测定了发生双爆源瓦斯爆炸时巷道内轴向压力的变化和对称切面围岩位移情况，研究成果表明：巷道内双爆源冲击波之间的相互作用使得巷道内的冲击波压力情况与单爆源时有着较大区别，发生双爆源瓦斯爆炸的巷道轴向各位置将会出现两次压力峰值，第一次压力峰值的大小与该处离近爆源的距离呈负相关，而第二次压力峰值的大小与该处离两爆源间冲击波碰撞面的距离呈负相关，巷道内双爆源的冲击波碰撞前后压力峰值并非简单的叠加而是急剧攀升；通过观察巷道内发生双爆源瓦斯爆炸时对称切面各处的壁面响应情况，由此可知在巷道发生双爆源瓦斯爆炸的安全设计中应该注重隅角与顶板处的防护。研究结果可为巷道结构的安全设计提供理论参考。

Abstract: In order to study the damage characteristics of dual explosion source gas explosion shock waves on the wall structure of roadway, a dual explosion source gas explosion model was established using ANSYS/LS-DYNA. The overpressure propagation and effective stress of the shock wave in the roadway under the action of dual explosion source gas explosion were analyzed, and the changes in axial pressure and displacement of symmetrical section surrounding rock in the roadway during the occurrence of dual explosion source gas explosion were measured, The research results indicate that the interaction between the shock waves of the double explosion sources in the roadway results in a significant difference in the pressure situation of the shock wave in the roadway compared to a single explosion source. There will be two pressure peaks in the axial direction of the roadway where the double explosion source gas explosion occurs. The magnitude of the first pressure peak is negatively correlated with the distance from the near explosion source at that location, while the magnitude of the second pressure peak is negatively correlated with the distance from the collision surface of the shock wave between the two explosion sources at that location, The peak pressure before and after the collision of the shock waves from the dual explosion sources in the roadway is not simply a superposition, but a sharp increase; By observing the wall response at various symmetrical sections when a dual explosion source gas explosion occurs in the roadway, it can be concluded that in the safety design of a dual explosion source gas explosion in the roadway, attention should be paid to the protection of corners and roof. The research results can provide theoretical reference for the safety design of roadway structures.