摘要
为研究新建隧道爆破地震波不同成分对既有隧道结构安全的影响,基于地震学极化偏振原理,结合现场爆破振动监测和ANSYS/LS-DYNA数值模型,分析既有隧道衬砌振动波型的成分构成及特性,探讨既有隧道衬砌动拉应力与P波峰值合振速的关联性。研究结果表明:新建隧道MS1、MS3、MS5、MS7、MS9、MS11和MS13段毫秒延期爆破P、S和R波对既有隧道衬砌质点振动均有贡献,各段别前期均由传播速度最快的P波主导,而后S波和R波相继成为主导波型;地震波传播路径及测振点的位置与波型成分密切相关,新建隧道已开挖和未开挖2个区域所对应的既有隧道质点振动特性存在显著差异,当L/D>1.58(L为距爆源中心的水平距离,D为隧道净距)时,未开挖区域的S波最大幅值超过P波最大幅值,成为后续区段质点振动的主导波型;既有隧道衬砌动拉应力与P波峰值合振速线性相关性较好,安全振速阈值为10.53 cm/s。
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.
作者
伍福寿
张学民
韩淼
陈进
胡涛
周贤舜
王树英
朱凯
WU Fushou;ZHANG Xuemin;HAN Miao;CHEN Jin;HU Tao;ZHOU Xianshun;WANG Shuying;ZHU Kai(School of Civil Engineering,Central South University,Changsha 410075,China;MOE Key Laboratory of Engineering Structures of Heavy Haul Railway,Central South University,Changsha 410075,China;China Railway No.3 Engineering Group No.5 Engineering Co.Ltd.,Jinzhong 030699,China;Guizhou Highway Engineering Group Co.Ltd.,Guiyang 550001,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第4期1406-1417,共12页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51978671)
中铁开投科技计划项目(202101)。
关键词
近接隧道
爆破地震波
衰减特性
安全振速阈值
adjacent tunnel
blasting seismic wave
attenuation characteristics
safe vibration velocity threshold
