局部凹陷地形对爆炸地震波传播规律影响的研究

Study on the Influence of the Local Sag Terrain on the Propagation of Explosion Seismic Waves

为探索局部凹陷地形对爆炸地震波传播规律的影响,采用三维有限元数值模拟方法,研究了方形、V形和U形等凹陷地形下爆炸地震波的传播特征。研究发现:对于同一地形,测点的各向速度峰值大小顺序为 V x>V y>V z;在H和W 分别相同的情况下,U形地形的减震效果最好;不同局部地形对爆破振动的频域宽度及优势频率均有影响,地震波经过V形和U形地形后,优势频率向高频方向移动,经方形沟槽后优势频率向低频方向移动。

In order to explore the influence of local sag terrain on the propagation of explosive seismic waves,the propagation characteristics of explosion seismic waves in square,V-shaped and U-shaped terrains are studied by using three-dimensional finite element numerical simulation method.The study found that for the same topography,the order of the velocity peaks of the measuring points is V x>V y>V z;in the case of the same H and W ,the U-shaped terrain has the best damping effect;The frequency domain width and the dominant frequency are affected by the different local topography .After the seismic wave passes through the V-shaped and U-shaped terrains,the dominant frequency moves toward the high frequency direction,and the dominant frequency moves toward the low frequency direction after the square terrains.