中南大学学报（自然科学版）2024，Vol.55Issue(4)：1406-1417,12.DOI:10.11817/j.issn.1672-7207.2024.04.014
近接既有隧道爆破激发地震波成分构成及特性研究
Study on the components and characteristics of seismic waves induced by blasting in adjacent existing tunnel
摘要
Abstract
In order to study the influence of different components of blasting seismic waves on the safety of existing tunnel structures,based on the principle of polarization in seismology,combined with on-site blasting vibration monitoring and ANSYS/LS-DYNA numerical model,the components and characteristics of existing tunnel lining vibration waveforms were analyzed,and the correlation between dynamic tensile stress of existing tunnel lining and the peak resultant P-wave velocity was explored.The results show that the P-wave,S-wave and R-wave of MS1,MS3,MS5,MS7,MS9,MS11 and MS13 millisecond delayed blasting in the new tunnel all contribute to the particle vibration of the existing tunnel lining.The fastest propagating P-wave dominates in the early stage of each section,and S-wave and R-wave become the dominant wave patterns successively in the corresponding period.The location of seismic wave propagation path and vibration measurement point are closely related to the waveform components.Meanwhile,the particle vibration characteristics of existing tunnels corresponding to the excavated and unexcavated areas are significantly different.When L/D>1.58(L represents horizontal distance from the explosion source center and D represents tunnel clear distance),the maximum amplitude of S-wave in the unexcavated area exceeds that of P-wave and becomes the dominant waveform of particle vibration in the subsequent section.The dynamic tensile stress in the existing tunnel lining has a good linear correlation with the peak resultant vibration velocity of P-wave,and the safe vibration velocity threshold is determined to be 10.53 cm/s.关键词
近接隧道/爆破地震波/衰减特性/安全振速阈值Key words
adjacent tunnel/blasting seismic wave/attenuation characteristics/safe vibration velocity threshold分类
数理科学引用本文复制引用
伍福寿,张学民,韩淼,陈进,胡涛,周贤舜,王树英,朱凯..近接既有隧道爆破激发地震波成分构成及特性研究[J].中南大学学报（自然科学版）,2024,55(4):1406-1417,12.基金项目
国家自然科学基金资助项目(51978671) （51978671）
中铁开投科技计划项目(202101)(Project(51978671)supported by the National Natural Science Foundation of China （202101）
Project(202101)supported by the Science and Technology Program of China Railway Development Investment Group Co.Ltd.) （202101）
