下穿隧道爆破振动测试及能量分布研究

Vibration testing and energy distribution research of underpass tunnel blasting

依托具体的下穿隧道工程实例,对爆破施工引起的地面振动效应进行系统研究。为进一步分析隧道爆破对既有村庄带来的振动影响,引入反映高程的影响因子,通过量纲分析的方法建立反映高程影响的质点峰值振动速度的预测模型。预测结果表明,与传统的萨道夫斯基公式相比,改进公式的预测效果更佳。此外,通过小波包分析对爆破振动能量的分布特征进行研究。研究结果显示,随着最大单响药量的增大,爆破振动的低频带能量占比明显上升;随着爆心距的增加,爆破振动总能量却呈逐步衰减的趋势,且随着爆心距的逐渐增大,爆破振动能量的变化趋于平缓。爆破振动总能量的拟合结果表明,振动能量随着爆心距的增大呈指数型衰减。然而,爆破振动能量随着最大单响药量的增大却呈现增大的趋势。

Based on the concrete example of underpass tunnel project,the ground vibration effect caused by blasting construction is systematically studied.In order to further study the vibration impact of tunnel blasting on existing villages,an influence factor reflecting the elevation was introduced.Furthermore,a prediction model for the peak vibration velocity of particles reflecting the influence of elevation is established by means of dimensional analysis.The prediction results show that,compared with the traditional Sadowski formula,the prediction effect of the improved formula is better.In addition,the distribution characteristics of blasting vibration energy are studied by wavelet packet analysis.The research results show that with the increase of the maximum charge per delay,the proportion of blasting vibration low-frequency band energy increases significantly.With the increase of the distance from blast area,the total blasting vibration energy shows a trend of gradual attenuation.Moreover,with the gradual increase of the distance from blast area,the change of blasting vibration energy tends to be gentle.The fitting results of the total blasting vibration energy show that the vibration energy decays exponentially with the increase of the distance from blast area.However,the blasting vibration energy shows a gradually increasing trend with the increase of the maximum charge per delay.