巷道截面形状对结构安全稳定性的影响数值模拟及实验研究
Numerical Simulation and Experimental Study on Effect of Section Shape of Roadway on Safety and Stability of Structures
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摘要: 为了研究井下炮掘巷道截面形状对爆炸冲击波传播规律、壁面爆炸载荷分布特性以及结构安全稳定性的影响,采用有限元计算方法对爆炸冲击波在截面形状分别为正方形、圆形和马蹄形3种模型内的爆炸过程进行了数值模拟,获得了3种截面形状在轴向方向上相应特征点的压力时程曲线,以及结构壁面上的爆炸载荷时程曲线,同时针对正方形管道尺度展开相应的实验研究,得到波系演化过程及载荷分布特性。研究结果表明:以正方形模型为例,冲击波衰减规律与壁面爆炸载荷分布特性的数值模拟和实验结果区域一致,误差小于15%;截面为马蹄形的计算模型壁面爆炸载荷分布特性最小,安全性最高,但局域易造成应力集中。Abstract: To study the influence of the cross-section shape of underground gun-driven roadway on the propagation law of blast wave, the distribution characteristics of blast load on the wall surface and the safety and stability of the structure, the finite element method was used to simulate the explosion process of blast wave in three models with square, circular and horseshoe shapes, and the pressure time-history curves of the corresponding characteristic points in the axial direction of the three cross-section shapes and the explosion load time-history curves on the structural wall surface were obtained. At the same time, the evolution process of wave system and the load distribution characteristics of square pipe are obtained for the square pipe scale by corresponding experimental study. The results show that, taking the square model as an example, the attenuation law of the shock wave is consistent with the numerical simulation and experimental results of the wall explosion load distribution characteristics, and the error is less than 15%; the calculation model with horseshoe-shaped section has the smallest explosive load distribution characteristics and the highest safety, but the local area is easy to cause stress concentration.
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Keywords:
- blast shock wave /
- reflected pressure /
- cross section shape /
- structural stability /
- explosive load
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