Tunnel excavations are commonly carried out using the drill and blast method, which may cause blast-induced damage to adjacent buildings. Peak particle velocity (PPV) is a widely used parameter for evaluating the damage of blasting vibration. However, accurately predicting PPV is difficult with traditional empirical predicting methods because their results are often different from actual conditions. In this study, attenuation formula of propagation velocity of elastic stress waves in elastomer is derived on the basis of stress wave theory. Moreover, the formula for predicting PPV is modified in the case of multihole and multistage blasting and then applied to Guanlinzi Tunnel, which downtraverses through National Highway 316. Results show that the modified formula obtains a small relative error between predicted and in situ monitoring PPVs and can properly reflect the propagation law of PPV under the condition of multihole and multistage blasting. This work has important application prospects and can provide a reference for similar excavation blasting and vibration control methods.

中文翻译：

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隧道施工爆破振动对既有道路的影响

隧道开挖通常使用钻爆法进行，这可能会对相邻建筑物造成爆破损坏。峰值粒子速度（PPV）是评估爆破振动破坏的广泛使用的参数。然而，传统的经验预测方法很难准确预测PPV，因为它们的结果往往与实际情况不同。本研究基于应力波理论推导出弹性应力波在弹性体中的传播速度衰减公式。此外，对多孔多级爆破情况下的PPV预测公式进行了修正，并将其应用于下穿316国道的关林子隧道。结果表明，修正后的公式得到的预测和现场监测PPVs的相对误差较小，能够较好地反映多孔多级爆破条件下PPV的传播规律。该工作具有重要的应用前景，可为同类开挖爆破及振动控制方法提供参考。