毛祚财
MAO Zuo-cai

• 1:福州市城乡建总集团有限公司

摘要(Abstract)：

为了缓解城市日益增长的交通压力以及大量现有小断面市政公路隧道存在改扩建为大断面隧道的需求，以福州市马尾隧道原位扩建工程为背景，通过振动信号的时域分析、频域分析和小波时频分析，对其北洞钻爆法作业过程中，南洞衬砌的振动效应进行现场测试，并进一步探讨了多空洞赋存条件下测点振动能量衰减特征。结果表明：测点总振速满足安全要求，说明原位扩建采用的爆破方案设计合理；测点振动能量主要集中在中频段(40～300 Hz),其能量占比达到90%以上；同等条件下振动总能量与爆破药量大致成正比；振动能量在穿越双空洞过程中衰减严重(较单空洞衰减50%);振动传播过程中，除能量耗散外，还有相当部分振动能量由高频向低频迁移。
In order to alleviate the growing traffic pressure in the city and meet the requirements for reconstruction and expansion of a large number of existing small-section municipal highway tunnels into large-section tunnels, taking the in-situ expansion project of the Mawei Tunnel in Fuzhou as the background, the vibration effect of the lining in the south hole was tested on site during the drilling and blasting operation of the north hole, and the vibration energy attenuation characteristics of the measuring points under the condition of multiple voids are further discussed through the time domain analysis, frequency domain analysis and wavelet time-frequency analysis of the vibration signals. The results show that the total vibration velocity of the measuring points meets the safety requirements, which indicates that the blasting scheme used in the in-situ expansion is reasonable. The vibration energy of the measuring points is mainly concentrated in the middle frequency band(40～300 Hz), and its energy ratio reaches more than 90%. Under the same conditions, the total vibration energy is roughly proportional to the blasting charge. The vibration energy is seriously attenuated in the process of passing through the double cavities(50% attenuation compared with the single cavity). In the process of vibration propagation, in addition to energy dissipation, a considerable part of vibration energy migrates from high frequency to low frequency.

关键词(KeyWords)： 钻爆法;隧道原位扩建;振动测试;既有空洞;小波分析
drilling blast method;in-situ tunnel expansion;blasting vibration monitor;existing cavity;wavelet analysis

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 毛祚财
MAO Zuo-cai

DOI: 10.19931/j.EB.20200236

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