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Determination of dynamic rock strength to assess blasting efficiency

机译：确定动态岩石强度以评估爆破效率

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Dynamic tests using the Split Hopkinson Pressure Bar test (SHPB) were conducted on graniternspecimens in order to study the efficiency of the drill and blast method and the environmental impact of thernexcavation of a tunnel in urban areas. The tests were performed at different strain rates of loading correspondingrnto variable energy levels. Compared to the static uniaxial strength, the dynamic strength of the rock was foundrnto be much higher. The dynamic strength clearly increases with the strain rate of the loading but decreasesrnwith the duration of load application. The same conclusions can be drawn for the Young’s modulus. Using thernexperimental results, the strength parameters of the rock were back calibrated using a Finite Element model ofrnthe test; preliminary numerical simulations of SHPB tests gave good results. These results can therefore be usedrnto correlate the blasting load to the damage observed in the tunnel during excavation.
机译：为了研究钻爆方法的效率以及城市地区隧道开挖对环境的影响，对花岗岩样进行了使用斯普利特霍普金森压力棒试验（SHPB）的动态试验。该测试是在不同的载荷应变率下进行的，这些载荷对应于可变的能量水平。与静态单轴强度相比，发现岩石的动态强度要高得多。动强度明显随载荷的应变率而增加，但随载荷施加的持续时间而降低。对于杨氏模量可以得出相同的结论。利用试验结果，使用试验的有限元模型对岩石的强度参数进行了反校准。 SHPB测试的初步数值模拟给出了良好的结果。因此，这些结果可用于将爆破荷载与挖掘过程中在隧道中观察到的破坏联系起来。

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