关键词: Ricker类子波, 爆炸应力波, 径向位移, 环向位移, 质点振动

Abstract: In order to study the explosive stress wave propagation in rock media, the single cylindrical cavity blasting was 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, as well as the vibration features of the media was analyzed. The numerical result illustrates that the compressive wave (P wave) have 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 provide a useful way to reconstruction the explosive stress wave propagation process using ricker-like wavelet as explosion, which would have great significance in the study of explosive stress wave propagation and its interaction mechanism with rock media.