关键词: 爆炸应力波, 节理裂隙, 衰减规律, 爆破荷载, FLAC^3D, 数值模拟

Abstract: In an attempt to better research the dynamic stability of surrounding rock structure, the rules of propagation and energy attenuation of blasting stress wave in layered jointed rock mass were obtained. With Fenghuangshan iron ore as a research background, geomechanics models of roadway were established in line with the similarity principle: one jointed rock mass with 2 parallel horizontal joints on top of roadway, and one intact rock mass containing no joint. With the vibration waveform curve as the input frequency of vibration load, the particle velocities of blasting stress wave at different instances and positions of jointed rock mass model and those of intact rock mass model were compared between model test and FLAC^3D numerical simulation. Model test results are in good agreement with computation results: the attenuation of blasting stress wave in jointed rock mass is faster than that in intact rock mass; at the same particle position, the attenuation varies in different directions. The present research serves as an important theoretical basis for obtaining blasting stress wave law and roadway support.

Key words: blasting stress wave, jointed fracture, attenuation law, blasting load, FLAC^3D, numerical simulation