中文摘要：

以某海底顶管工程为背景,针对其施工中需要在加压条件下用微差爆破的方法来穿越岩层的特殊工况进行了三维有限元分析.数值分析充分考虑了不同地层、不同堵塞长度条件下,爆破对顶管及其周围土体的影响.分析结果表明：爆破对设备的冲击随堵塞长度的增加而减小,合适的堵塞长度可以明显减小爆破对工具的影响;全断面爆破比半断面爆破对岩层的影响较小;中心孔比周边孔对周围土体影响小.

英文摘要：

Short-delay blasting was used in a pipe-jacking tunnel in order to pass through rock stratum. And three-dimensional finite element numerical analysis on the influence of the blasting to bored machine and surrounding ground was carried out. The effects of different ground conditions, different clogged lengths were carefully analyzed in the numerical analysis. The analysis results indicate that shock and vibration of blasting on the bored machine reduce with the increase of clogged length. An appropriate clogged length can evidently decrease the influence of blasting on the machine. The blasting vibration on the surrounding rock of full rock face is smaller than that of half rock face condition. The influence of central hole is smaller than that of peripheral hole.