瓦斯爆炸对巷道壁面损伤破坏的数值模拟研究

为了研究巷道内瓦斯爆炸冲击波对巷道壁面结构的损伤破坏,利用ANSYS/LS-DYNA建立巷道瓦斯爆炸物理模型和数学模型,对掘进巷道瓦斯爆炸冲击波破坏特性进行数值模拟研究。结果表明:在巷道壁面边缘位置和中心位置超压测值较大,其壁面损伤相对更为严重;冲击波在巷道轴向壁面也会出现反射和叠加,导致整体超压峰值上下振荡波动;瓦斯爆炸后冲击波向开口方向传播,瓦斯区壁面受到的载荷最大,并逐渐向空气区加载扩散;随着爆炸冲击波能量衰减,而应力持续加载在壁面结构,压力集中对壁面结构施加静态破坏,最后超过其承受能力,导致巷道失稳破坏。研究结果可为优化巷道结构的设计提供理论参考。

Numerical simulation study on damage and failure of roadway wall caused by gas explosion

In order to study damage of gas explosion shock wave to roadway wall structure, the physical model and mathematical model of gas explosion in roadway are established by ANSYS/LS-DYNA. The damage characteristics of gas explosion shock wave in driving roadway are studied by numerical simulation. Research shows that the overpressure values at the edge and center of the roadway wall surface are large, and the wall surface damage is relatively more serious. The reflection and superposition of shock wave will also occur on the axial wall of roadway, which will cause the fluctuation of the whole overpressure peak value. After the gas explosion, the shock wave propagates to the direction of the opening, and the wall surface of the gas area receives the maximum load, and gradually spreads to the air area. With the energy attenuation of explosive shock wave, and the stress is continuously loaded on the wall structure, the pressure concentration exerts static damage on the wall structure, and ultimately exceeds its bearing capacity, resulting in instability and failure of the roadway.