Vibration testing and energy distribution research of underpass tunnel blasting
SI Xiaokun, GUO Ming, ZHAO Yan
1. Huanghe Jiaotong University, Jiaozuo 454950, China;
2. School of Emergency Management, Henan Polytechnic University, Jiaozuo 454003, China;
3. Hebei University of Architecture, Zhangjiakou 075000, China;
4. Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance of Hebei Province, Zhangjiakou 075000, China
Abstract: 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.
Keywords: tunnel blasting;dimensional analysis;wavelet packet analysis;blasting vibration energy
2023, 49(9):57-63  收稿日期: 2022-4-18;收到修改稿日期: 2022-8-1
基金项目: 国家自然科学基金（52078468，51878242）；河北建筑工程学院博士启动基金（B-202304）；教育部产学合作协同育人项目（202102350019）
作者简介: 司小昆（1989-），男，河南焦作市人，讲师，硕士，研究方向为安全工程。
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