钻孔爆破中质点振动速度的预测公式探讨

以人和场浅埋隧道掘进爆破的地震波实测数据为基础，通过分析隧道边墙和地表振动速度在不同爆破条件下的变化特征发现，同一测点的振动速度除了与药量、爆源距有关外，还与钻孔爆破的自由面条件有关。针对萨道夫斯基公式不能反映钻孔爆破的自由面尺寸的不足，提出了可体现自由面面积对爆破震动强度产生较大影响这一特点的修正公式。对实刹振动速度的预测计算表明，该修正公式的准确率比萨道夫斯基公式高80％，且对于质点振动速度大于0．5cm／s的测点，其相对误差不超过5％的测点数达90％以上，而萨道夫斯基公式的相应值则小于15％。

Investigation on Formula of Predicting the Particle Vibration Velocity in Drilling Blasting

On the basis of practically measured data from seismic wave in a tunnel driving blasting, it is found, from analyzing the variation characteristics of vibration velocites of tunnel slope and surface under different explosive conditions, that the vibration velocity of a measured point is related to the free surface of drilling blasting besides the dose and blasting distance. A revised formula, which can reflect the influence of free surface on vibration intense, is put forward. The predicting calculation results show that the accuracy increases by 80%, the measured particles number reaches 90% with its relative error lower than 5% and vibration velocity higher than 0.5 cm/s.