煤矿瓦斯爆炸冲击下的弧形防爆墙数值模拟研究

Numerical simulation study on curved explosion-proof wall under the impact of coal mine gas explosion

为研究掘进面、巷道、采空区、生产隔离区等地点的瓦斯爆炸防护墙的弧度对冲击波的影响,采用ANSYS/LS-DYNA有限元软件对圆心角分别为30°,45°,60°,75°,90°的弧形防爆墙在相同高度、药量和爆距条件下的计算模型进行了模拟,对墙后水平和竖直方向测点的超压值进行分析,并对比经验公式,得出不同弧度下防护墙体的冲击波分布规律以及墙后超压的分布特点。结果表明:(1)相比于直墙式防爆结构,弧形防爆墙受到爆炸冲击波时具有更好的消减作用;(2)各测点压力按照分布特点呈现先增加后衰弱的趋势,不同测点峰值压力受距离墙体和地面远近的影响;(3)相比于其他弧度防爆墙,弧度为60°防爆结构具有较好的抗爆炸冲击波效果。

In order to study the influence of the radian of the gas explosion-proof wall on the shock wave in tunneling face,roadway,goaf and production isolation area,the calculation models of the arc-shape explosion-proof wall with 30,45,60,75,90 degrees of the central angle were simulated by finite element software ANSYS/LS-DYNA under the same height,charge quantity and explosion distance.The horizontal and vertical directions overpressure of the points behind the wall were measured.By comparing with the empirical formulas,the shock wave distribution of explosion-proof wall in different radius and distribution characteristic of overpressure behind the wall were obtained.The results showed that:(1)Compared with the straight-wall explosion-proof structures,the arc-shaped explosion-proof wall had a better reduction effect when being subjected to explosive shock wave;(2)According to the distribution characteristics,the pressure at each measuring point increased first and then decreased,the peak pressure at different measuring points was affected by the distance between the wall and the ground;(3)Compared with other radian explosion-proof walls,the 60 degree radian explosion-proof structure had better anti-explosion shock wave effect.