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首页> 外文会议>Asia-Pacific Conference on Shock amp; Impact Loads on Structures; 20031112-14; Changsha, Hunan,(CN) >EXPERIMENTAL INVESTIGATION ON THE EFFECT OF BUBBLE ENERGY LOADING IN ROCK BLASTING
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EXPERIMENTAL INVESTIGATION ON THE EFFECT OF BUBBLE ENERGY LOADING IN ROCK BLASTING

机译：爆破中气泡能量加载效应的实验研究。

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摘要

In order to investigate into the effect of bubble energy (E_b) loading in rock fragmentation under the explosion of a coupling charge within borehole, two groups of contrast fragmentation experiments were conducted in cylindrical concrete models. In the first group, the charge with the constant ratio of shock energy (E_s) to E_b was used to break the models with different acoustic impedance. In the second group, the models with the constant impedance were separately broken by the charges with the different ratio of E_s to E_b. The experimental results showed that, with increase in the peak (P_t) of the transmission compressive stress in the borehole's wall, the mass of small size fragments of the first group rose while that of the second group decreased. The analysis results indicated that the mass of small size fragments depends on the level of both E_s impact and E_b loading dynamically against the surrounding media. Single P_t merely represents the level of E_s impact. Change in the mass of small size fragments relating to E_b loading may imply that, besides the action of quasi-static gases pressure on the wall of borehole, E_b stored in the detonation gases plays an active role in rock fragmentation by loading dynamically.
机译：为了研究气泡能量（E_b）负荷在钻孔内耦合装药爆炸下岩石破碎中的影响，在圆柱混凝土模型中进行了两组对比破碎实验。在第一组中，使用具有恒定冲击能量（E_s）与E_b比率的电荷来破坏具有不同声阻抗的模型。在第二组中，具有恒定阻抗的模型被具有不同E_s与E_b比率的电荷分开破坏。实验结果表明，随着井壁传输压应力峰值（P_t）的增加，第一类小碎片的质量增加，而第二类小碎片的质量减少。分析结果表明，小尺寸碎片的质量取决于E_s的撞击程度和E_b对周围介质的动态载荷。单个P_t仅代表E_s的影响程度。与E_b加载有关的小尺寸碎片质量的变化可能意味着，除了准静态气体压力作用在井壁上之外，爆炸气体中存储的E_b通过动态加载在岩石碎裂中也起着积极作用。

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