岩性对爆破地震波能量分布特征的影响研究

Research on the Influence of Lithology on the Energy Distribution Characteristics of Blasting Seismic Waves

为研究不同岩性对爆破地震波能量分布特征影响,通过数值模拟,研究了岩石、微风化岩石、砂岩、塌积物等四种岩石介质以及改变岩石的密度、弹性模量、抗压强度等物理力学参数对爆破地震波能量分布特征影响,同时,与实验室模拟测试实验和现场爆破测试实验进行了对比分析。研究表明:在炸药震源近区,地震波信号的频率高达几千到几万Hz,且岩石越坚硬,越致密,地震波的频率越高,能量越强;在炸药震源远区,地震波信号的频率仅为几十到几百Hz,且岩石越松软,密度越小,地震波能量越强。In order to study different lithologies’ effects on the energy distribution characteristics of blasting seismic waves, four rock media such as rock, slightly weathered rock, sandstone and colluvium are studied through numerical simulation, and the influence of changing rock density, elastic modulus, compressive strength and other physical and mechanical parameters on the energy distribution characteristics of blasting seismic waves is studied. At the same time, the findings were compared with laboratory simulation tests and field blasting experiments. The results show that in the near area of the explosive source, the frequency of seismic wave signals can reach several thousand to tens of thousands of Hz, and the harder and denser the rock, the higher the frequency and the stronger the energy of the seismic waves;On the far area, the frequency of seismic wave signals is only tens to hundreds of Hz, the softer and less dense the rock, the stronger the energy of the seismic waves.