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Experimental and numerical investigations of dynamic failure process in rock under blast loading

机译：爆炸载荷作用下岩石动力破坏过程的实验与数值研究

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For study the dynamic failure processes between adjacent boreholes with decoupling charge, the single-hole and double-hole blast loading experiments are set up with granitic samples. High-speed cameras (HS) and digital image correlation (DIC) methods are adopted to obtain strain field and crack development process. According to experimental results, the distribution of damage is symmetric around center hole under single-hole loading, shock wave falls off rapidly with increasing distance from the bore hole. Under double-hole loading, the damage and plastic strain are accumulated under second loading. The second loading makes the superposition of stress waves and the radial cracks formed between two holes. Meanwhile, the bimodal strain-time curve is found along vertical direction, and indicates the no damage is generated by elastic deformation is formed. According to the numerical results, the dynamic responses under two loads are agreed well with experimental results. The borehole pressure is much high when decoupling factors (K) is 1, and then linearly decreased with K increase. The horizontal cracks run through specimen as K = 2 ∼ 5, and the vertical cracks linearly decrease with K increases.
机译：为了研究相邻钻孔之间带解耦装药的动态破坏过程，对花岗岩样品进行了单孔和双孔爆破加载实验。采用高速相机（HS）和数字图像相关（DIC）方法获得应变场和裂纹发展过程。根据实验结果，单孔载荷作用下中心孔周围的损伤分布是对称的，冲击波随着距井眼距离的增加而迅速下降。在双孔载荷下，损伤和塑性应变在第二载荷下累积。第二载荷使应力波和在两个孔之间形成的径向裂纹重叠。同时，沿垂直方向发现了双峰应变时间曲线，表明没有因弹性变形而产生损伤。根据数值结果，两种载荷下的动力响应与实验结果吻合良好。当解耦因子（K）为1时，井眼压力很高，然后随着K的增加而线性降低。水平裂纹以K = 2〜5的方式贯穿试样，垂直裂纹随K的增加而线性减小。

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