基于Ricker类子波的爆炸应力波传播规律研究

Study on propagation law of explosive stress wave based on ricker-like wavelet

为了研究爆炸应力波在介质中的传播过程,采用Ricker类子波作为爆炸场源,建立了单孔条形药包爆破的有限元数值计算模型,分析了爆炸应力波的传播规律及其对介质质点的扰动特征。研究结果表明:爆炸压缩波(P波)在岩体中的传播速度快于剪切波(S波),但剪切波(S波)的衰减较慢;在爆炸应力波的作用下,介质中的质点首先表现出较大的径向位移,随后又产生较大的环向位移,爆源近区的介质可能因急剧压缩而被压碎,随后又因环向张拉位移产生径向拉裂纹;在径向位移和环向位移的共同作用下,爆生裂纹将呈现出不断波动扩展的特性;采用Ricker类子波作为爆炸场源研究爆炸应力波在介质中的传播问题,对于再现爆炸应力波的传播过程,深入分析爆炸应力波的传播及其与介质的作用机理具有重要意义。

To study the explosive stress wave propagation in rock media,the single cylindrical cavity blasting is built using Finite Element Method（FEM）,in which the ricker-like wavelet was used as the explosion source.The propagation characteristic of explosive stress wave,and the vibration features of the media are analyzed.The numerical result illustrates that the compressive wave（P wave） has a higher spread velocity in rock media compared with shear wave（S wave）,which shows a slower attenuation.The vibration of the media presents a significant radial displacement at first,and then displays an obvious circumferential displacement.This means that the rock media around borehole may be crushed under high compressive stress,while radial tensile crack may arise with high circumferential displacement in the far field.The crack will present a fluctuation propagate under the mixed of the radial and circumferential vibration.In addition,this numerical method provides a useful way to reconstruction the explosive stress wave propagation process using ricker-like wavelet as explosion,which offers great significance in the study of explosive stress wave propagation and its interaction mechanism with rock media.