铁路立体交叉隧道施工爆破震动响应研究

Study on Construction Blasting Vibration Response in Railway Interchange Tunnel

通过建立不同交叉角度、净距和围岩条件的实验工况,对交叉段新建隧道施工爆破地震波引起的既有隧道衬砌的峰值速度进行分析,探讨了不同因素作用下立体交叉隧道施工爆破的动力响应。研究结果表明:处于迎爆侧的拱底和墙脚之间区域影响最为显著;除净距是上下交叉隧道最显著的影响因素外,随着交叉角度的增加,拱底速度峰值呈增大趋势,并且增长率逐渐加快;岩体坚硬完整,爆破振动波传播衰减越慢,爆破地震波在传到既有隧道之前,出现峰值回升。

Construction blasting of new tunnel induced seismic wave propagation may influence the safety of the existing tunnel.Through the analysis of vibration velocity peak,the dynamic response of cross tunnel under different tunnel interval,cross angle and rock condition was concluded.Results indicate that the maximum effect occurs between the arch bottom and wall foot facing the blasting side; clearance of cross tunnel is the most significant factors; with the crossing angle increases under the same clearance,the peak velocity of bottom arch was synchronized increasing and the rate of growth gradually accelerated; the blasting vibration wave propagation was decayed slower under complete and hard rock,peak velocity rebound when blasting seismic waves reach existing tunnel.