立体交叉铁路隧道爆破振动效应的研究  

Vibration Law in the Blasting of Railway Tunnels with Interchange

作　　者：高军伟 赵岩 王奔 GAO Junwei;ZHAO Yan;WANG Ben(Sanchu Co.,Ltd.,China Railway Tunnel Group,Chongqing,401121;School of Civil Engineering,Hebei University of Architecture,Hebei Zhangjiakou,075000;Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Resistance,Hebei Province,Hebei Zhangjiakou,075000)

机构地区：[1]中铁隧道集团三处有限公司,重庆401121 [2]河北建筑工程学院土木工程学院,河北张家口075000 [3]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000

出　　处：《爆破器材》2023年第6期39-47,共9页Explosive Materials

基　　金：国家自然科学基金(51878242);河北省创新能力提升计划项目(21567614H)。

摘　　要：依托京张高铁某交叉隧道工程,研究既有隧道二次衬砌在下部隧道爆破载荷作用下的动力响应特征。基于萨道夫斯基公式,以隧道交叉断面为界,研究交叉点分别位于掌子面前方及后方时对应的爆破振动峰值速度及振动主频率的衰减规律。为了弥补现有爆破安全规程中分段考虑频率影响方法的不足,通过回归分析的方式得到爆破振动峰值速度与主频率之间的数学关系,定量考虑爆破振动频率对爆破振动响应特征的影响。计算结果表明,综合考虑爆破振动频率与既有隧道自振频率的影响,优化计算得到的爆破振动峰值速度v_(PPS)小于实测振动数据v_(PP)。针对本交叉隧道爆破工程,下部隧道爆破施工对既有隧道的振动影响在可控范围内。Based on a blasting project of crossed tunnels of Beijing-Zhangjiakou High-Speed Railway,the dynamic response of the secondary lining of an existing tunnel to the blasting loads from the lower tunnel was studied.Based on Sadowski's formula,the attenuation laws of the peak velocity and main frequency of blasting vibration corresponding to the intersection points located in front of and behind the tunnel face were studied with the tunnel intersection section as the boundary.In order to compensate for the shortcomings of the method of segmented frequency influence in existing blasting safety regulations,the mathematical relationship between the peak velocity of blasting vibration and the main frequency was obtained through regression analysis,and the impact of blasting vibration frequency on the response characteristics of blasting vibration was quantitatively analyzed.The calculation results indicate that,taking into account the influence of blasting vibration frequency and existing tunnel natural vibration frequency,the optimized v_(PPS)is smaller than the measured vibration data v_(PP)。In this blasting project of crossed tunnels,the vibration impact of the lower tunnel blasting construction on the existing tunnel is within a controllable range.

关 键 词：交叉隧道 爆破振动响应 量纲分析 安全控制 爆破振动频率 

分 类 号：TD235[矿业工程—矿井建设] O383[理学—流体力学]