京张高铁八达岭隧道下穿长城爆破振动影响的预测与分析

京张高铁八达岭隧道两次下穿世界文化遗产八达岭长城,隧道拟采用钻爆法开挖。为避免长城在爆破振动下发生破坏,在八达岭隧道大跨过渡段布置微振检测系统,用以验证爆破控制技术的效果。同时,收集和整理实测数据,按萨道夫斯基公式及Ricker公式进行回归分析,确定爆破振动的相关参数,从而得出适合八达岭长城地区地质条件的质点峰值速度和拐角频率的预测公式。误差分析验证了预测公式具有较好的适用性,可以为隧道下一步穿越长城核心区爆破参数的确定和安全性控制提供理论依据。

Prediction and Analysis for the Influence of Blasting Vibration of Beijing-Zhangjiakou High-speed Railway Badaling Tunnel Underneath the Great Wall

The Badaling Tunnel of Beijing-Zhangjiakou High-speed Railway has passed under the Badaling Great Wall twice,a world cultural heritage.The Great Wall has significant research value and cultural significance.The tunnel is planned to be excavated by drilling and blasting method.In order to avoid damage of the Great Wall caused by the blasting vibration,the effect of blasting control technology is verified by arranging the micro-vibration detection system in the large-span transition section of the Badaling Tunnel.At the same time,the measured data are collected and collated,and the regression analysis is carried out according to the Sadov’s formula and the Ricker formula to determine relevant parameters of blasting vibration,so as to obtain the prediction formula of the peak velocity and corner frequency of the mass point suitable for the geological conditions of the Badaling Great Wall area.The error analysis proves that the prediction formula has good applicability,which can provide theoretical basis for the blasting parameter determination and safety control of the tunnel in the core area of the Great Wall,and provide reference for the design and construction of similar projects.