煤与瓦斯突出冲击波对防突风门破坏的研究

Research on the Structural Failure of Outburst Prevention Air Door According to Coal and Gas Outburst

为分析煤与瓦斯突出发生后防突风门的安全性,结合流体动力学研究突出冲击波对典型风门的破坏机制。基于理论推导,得到了煤与瓦斯突出条件下的冲击波传播模型,同时结合行业标准给出作用在风门上的反射超压。以防突风门工业试验数据和相关冲击载荷施加方程为基础,运用LS-DYNA软件对冲击载荷下的风门破坏进行模拟。研究表明:风门的应力随时间变化的趋势与载荷施加具有一致相关性,中心位置和靠近风筒位置是风门结构的薄弱处,峰值应力最高达到204.6 MPa,超过了Q195钢的屈服极限195MPa,需要加固。

In order to analyze the safety of outburst prevention air door after coal and gas outburst,the failure mechanism of typical air door caused by outburst shock wave was studied by fluid dynamics.Based on theoretical derivation,the model of shockwave propagation under coal and gas outburst was obtained,and the overpressure reflected on the air door was given in combination with the industry standard.Based on the industrial experimental data and the relevant impact load equation,LSDYNA software was used to simulate the failure of air door under impact load.The results show that,along with time,the change trend of stress of air door has a consistent correlation with the load.The center and the position close to the air duct are the weak points of the air door structure.The peak stress reaches up to 204.6 MPa,which is over to the yield limit of Q195 steel,so reinforcement is needed in the weak points of the air door structure.