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爆破开挖下相邻隧道围岩的振动速度与频率特性

Vibration velocity and frequency characteristics of surrounding rock of adjacent tunnel under blasting excavation.

作者信息

Luo Yi, Gong Hangli, Qu Dengxing, Zhang Xueping, Tao Yuhang, Li Xinping

机构信息

Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, 430070, China.

Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya, 572024, China.

出版信息

Sci Rep. 2022 May 19;12(1):8453. doi: 10.1038/s41598-022-12203-7.

DOI:10.1038/s41598-022-12203-7
PMID:35589768
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9120496/
Abstract

The aim of this study is to improve the accuracy of response prediction and safety evaluation of blasting vibration of a deeply-buried tunnel group. For this purpose, the expression of frequency-domain and blasting vibration velocity spectra for the equivalent blasting load in multiple holes was derived through theoretical analysis, and propagation and attenuation of the primary frequency of blasting vibration of multiple cutting holes and caving holes in the infinite rock mass were explored. Response characteristics of vibration frequency spectra in rock surrounding of the adjacent tunnel induced by full-section blasting excavation of the tunnel under the high in situ stress were studied using the dynamic finite element method. The research indicates that blasting vibration waves have the greatest influences on the adjacent tunnel at the haunch in the side facing the blasting, where the vibration velocity is inversely proportional to the spacing between tunnels and directly proportional to the tunnel diameter. The centroid frequency increases with the increase of the spacing between tunnels and tunnel diameter. Furthermore, vibration velocity spectra at the most affected location (namely the haunch) in the side facing blasting of the adjacent tunnel under different conditions were derived. The coincidence of the theoretical formula was verified by comparing measured data of blasting of diversion tunnels in Pubugou Hydropower Station (Sichuan Province, China). The research results can provide theoretical guidance and reference for the prediction of blasting vibration response of similar projects in the future.

摘要

本研究的目的是提高深埋隧道群爆破振动响应预测和安全评价的准确性。为此，通过理论分析推导了多孔等效爆破荷载的频域表达式和爆破振动速度谱，并探讨了无限岩体中多个掏槽孔和崩落孔爆破振动主频的传播与衰减规律。采用动态有限元法研究了高地应力下隧道全断面爆破开挖引起的相邻隧道围岩振动频谱响应特性。研究表明，爆破振动波对相邻隧道迎爆侧拱腰处影响最大，该处振动速度与隧道间距成反比，与隧道直径成正比。主频随隧道间距和隧道直径的增大而增大。此外，推导了不同工况下相邻隧道迎爆侧最不利位置（即拱腰）的振动速度谱。通过对比四川省瀑布沟水电站导流洞爆破实测数据，验证了理论公式的吻合性。研究成果可为今后类似工程爆破振动响应预测提供理论指导和参考。

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