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.
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.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第10期1581-1584,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50679041)
上海市浦江人才计划资助项目(08PJ1406600)
上海市重点学科资助项目(B208)
关键词
顶管
微差爆破
爆破冲击
数值分析
pipe-jacking
short-delay blasting
shock and vibration
numerical analysis
