关键词: 边坡开挖爆破, 爆轰波, 爆生气体, 裂纹扩展, 应力, 速度, 时程曲线

Abstract: A slope model with single blasting hole was established using ANSYS/LS-DYNA to study the characteristics of crack propagation during single-hole blasting. The crack morphology was simulated based on two forms of energy release during blasting. The time-history curves of stress and velocity of crack tip elements in three different locations were compared and analyzed. Research findings suggest that the change rate of stress and change rate velocity of crack tip element can be used to analyze different crack propagation patterns. Increase in the change rate of stress at crack tips is prone to produce axial extension; increase in the change rate of velocity is liable to induce radial extension. In addition, the ratio of average stress wave change rate of two cracks is about 2.25, which is consistent with the attenuation ratio of stress waves in different explode packages.

Key words: slope excavation blasting, detonation wave, explosive gas, crack propagation, stress, velocity, time history curves