新建后祠隧道爆破振动对既有隧道的影响研究

Study on Impact of the Newly Constructed Houci Tunnel Blasting Vibration on the Existing Tunnel

新建隧道爆破施工不可避免地对既有隧道的通行安全产生影响。依托福建厦蓉高速公路后祠隧道扩建工程,研究新建隧道爆破施工对既有隧道的影响规律。通过现场监测与数值模拟相结合,得出爆破振动沿既有隧道横断面和轴线方向的动力特性,指出振动响应受到不同外界因素(围岩级别、中夹岩厚度、开挖进尺、自由面条件)的显著影响。

The blasting construction of newly constructed tunnel inevitably influences the existing tunnel＇s safety. Based on the extension project of Houci tunnel in Xiarong highway of Fujian Province, the influence law of the newly constructed tunnel blasting vibration on the existing tunnel is studied. Combined field monitoring with numerical simulation, the dynamic response characteristics of the cross-section and axis direction of the existing tunnel is obtained, which is pointed out to be influenced obviously by multiple external factors （surrounding rock type, the thickness of mid-adjacent rock, the excavation size, free-surface condition）.