铁路隧道初期支护混凝土爆破累积损伤特征  

Cumulative damage characteristics of tunnel initial support concrete under blasting load

作　　者：杨德志 赵岩[2,3] 王海龙 YANG Dezhi;ZHAO Yan;WANG Hailong(Luohe Institute of Technology,Henan University of Technology,Luohe 462000,China;Hebei University of Architecture,Zhangjiakou 075000,China;Key Laboratory of Civil Engineering Diagnosis,Renovation and Disaster Relief in Hebei Province,Zhangjiakou 075000,China)

机构地区：[1]河南工业大学漯河工学院,河南漯河462000 [2]河北建筑工程学院,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：《混凝土》2024年第10期40-45,共6页Concrete

基　　金：国家自然科学基金(51878242,52078468,52274148);驻冀高校与石家庄市产学研合作项目(241790797A);河北省自然科学基金(E2023402103);河北省高等学校科学研究青年拔尖项目(BJK2024118)。

摘　　要：依托京张高铁草帽山隧道工程,开展爆破振动监测及声波测试。爆破振动监测结果表明:隧道初期支护对应的质点峰值振动速度满足萨道夫斯基公式。声波测试结果表明:随着爆破次数的增多,爆破累积损伤逐渐增大。但随着爆破距离的增大,累积损伤的增量却呈逐渐减小的趋势。通过数据分析及曲线拟合的方式分别得到爆破施工对应的累积损伤范围(R_(cr))及临界爆破振动速度(PPV_(cr))。数值分析结果显示,累积损伤范围(R_(cr))与对应的临界爆破振动速度(PPV_(cr))之间存在良好的指数函数关系,通过设定相应的爆破振动速度阈值可以达到定量控制爆破损伤范围的目的。Relying on the Beijing-Zhangjiakou high-speed railway Caomao Shan tunnel project,blasting vibration monitoring and sound wave testing experiments were carried out.The vibration monitoring results show that the blasting vibration velocity corresponding to the initial support satisfies the Sadowski formula.The results of the sonic test show that with the increase of blasting times,the cumulative damage increases gradually,but the blasting damage increment shows a downward trend.In addition,as the blasting distance decreases,the blasting cumulative damage effect is significant.Through data analysis and curve fitting,the cumulative damage range R_(cr)and critical blasting vibration velocity PPV_(cr)corresponding to blasting construction are obtained respectively.The numerical analysis results show that there is a good exponential function relationship between the cumulative damage range R_(cr)and the corresponding critical blasting vibration velocity PPV_(cr).The purpose of quantitative control of blasting damage can be achieved by setting the corresponding vibration velocity threshold.

关 键 词：声波测试 爆破振动监测 爆破荷载 累积损伤 初期支护 控制阈值 

分 类 号：TU528.01[建筑科学—建筑技术科学]