中文摘要：

新（扩）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。依托福建漳龙高速公路后祠隧道扩建工程,对隧道改扩建工程爆破施工的振动监测以及控制技术进行研究。通过现场监测与数值模拟相结合的方法,研究了爆破施工对既有隧道的振动影响,并对现有的爆破施工方案进行优化。研究结果表明：现有方案下新建隧道爆破施工不会危及左侧老洞的安全,新、扩建隧道爆破施工对既有隧道产生的振动响应存在一定的不同,建议掏槽孔各孔间延时时间定为15 ms,既有右侧隧道原位扩建时应当首先开挖左侧岩体。

英文摘要：

The blasting construction of newly constructed （ in-situ enlarged） tunnel inevitably influences the ex- isting tunnel＇ s safety. Based on the extension project of Houci tunnel in Zhangzhou--longyan highway of Fujian Province, the technology for monitoring and controlling blasting-induced vibration during tunnel construction is ad- dressed. Combined field monitoring with numerical simulation, the influence law of blasting vibration on the existing tunnel is studied. Ultimately, the optimizing suggestions are put forward. The results show that the process of the newly constructed tunnel construction cannot endanger the stability of the existing tunnels; there are significant differences about the impact on the existing tunnel influenced by the blasting process of the newly constructed （ in- situ enlarged） tunnel; reasonable millisecond-delay time should be 15 ms, the left surrounding rock should be ex- cavated preferentially in the process of in-situ enlarged tunnel construction.