为研究边坡单孔爆破过程中裂纹扩展形态特征,利用ANSYS/LS-DYNA建立边坡单炮孔模型,基于爆破过程中能量释放的2种形式对裂纹形态进行模拟分析,并对3处不同位置的裂纹尖端单元进行应力与速度时程曲线对比分析。研究表明:以连续的裂纹尖端单元应力变化率与速度变化率为参数可用于分析不同裂纹扩展形态,随裂纹尖端处应力变化率增大易产生轴向延伸,随速度变化率增大易产生径向延展;模拟得出两裂纹平均应力波变化率之比约为2.25倍,与不同药包形式的应力波衰减比例关系较为吻合。研究成果可为岩体开挖爆破设计提供一定的参考。
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.
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
Key words
slope excavation blasting /
detonation wave /
explosive gas /
crack propagation /
stress /
velocity /
time history curves
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基金
国家自然科学基金项目(51566010,51076061);甘肃省自然科学基金项目(B061709)
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