基于单孔爆破的节理裂隙减振模型试验研究

发布时间：2018-03-09 19:05

本文选题：爆破振动效应　切入点：单孔爆破　出处：《振动与冲击》2017年07期 　论文类型：期刊论文

【摘要】：在复杂环境的城市地下工程进行爆破开挖,对青岛地铁控制爆破振动危害提出了极高标准;基于考虑富含天然裂隙岩石地质条件下,通过模型试验研究了岩体裂隙对爆破振动波传播规律的影响。试验结果表明,岩体裂隙的存在阻碍了爆破振动波的传播,明显降低了爆破振动效应,当增加装药量时,爆破振动效应就越强且趋势变快,爆破振动频率也越靠近建筑物固有频率;当裂隙深度发育越深时,爆破振动效应就越弱,可裂隙深度过大,降低爆破振动效应程度并不明显;同时裂隙深度的发育,对各向爆破振动频率影响趋势基本一致,表现出波动性极小。波形频谱表明单孔爆破试验中爆破振动信号波形简单,振动峰值和频率单一。
[Abstract]:The blasting excavation of urban underground engineering in complex environment puts forward a very high standard for the hazard of controlled blasting vibration of Qingdao Metro, based on the consideration of geological conditions rich in natural fissures, The influence of rock mass fissures on the propagation law of blasting vibration wave is studied by model test. The experimental results show that the existence of rock fissure hinders the propagation of blasting vibration wave and obviously reduces the blasting vibration effect. The stronger the blasting vibration effect is and the faster the trend becomes, the closer the blasting vibration frequency is to the natural frequency of the building, the weaker the blasting vibration effect is when the crack depth grows deeper, the larger the crack depth is, the less obvious the blasting vibration effect is to reduce the blasting vibration effect. At the same time, the development of fracture depth has the same effect on the vibration frequency of blasting in every direction, and the wave wave spectrum shows that the vibration signal of single hole blasting is simple, and the peak and frequency of vibration are single.
【作者单位】：安徽理工大学土木建筑学院;
【基金】：国家自然科学基金资助项目(51274009;51374012;51404010)
【分类号】：TB41

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