摘要
在建筑物密集的城市繁华地带的地下,进行大跨度隧道的开挖,只有结合实际情况制定合理的开挖方案才能使地面建筑物免受爆破振动的危害。针对嘉华隧道的实际情况,根据理论分析及现场试验,研究相应的爆破方案,提出在加宽段A采用上下台阶开挖,在加宽段B、C、D、E采用上导坑开挖的合理爆破方案。同时,给出隧道光面爆破参数的选取原则和加宽段B的施工布置。通过对爆破地震波的监测及结果分析,确立其传播衰减规律,以此从最大装药量、非电毫秒雷管段别、相邻段位的时差、掘进进尺等4个方面提出爆破参数优化措施,现场实施后取得满意效果。其对隧道工程开挖爆破施工和保证地面建筑物安全起到指导作用。
Vibration-resistance can be incorporated into blasting designs to avoid damages caused by the excavation of large-span tunnels in busy urban areas, but only by basing excavation design schemes on actual situations. In view of the actual situation in the Jahua tunnel in Chongqing, P. R. China, research was conducted to identify a relevant explosion scheme. The research was based on theoretical analysis and in-situ testing. Face step excavation was considered in the broadening band A, and upper drift excavation was adopted in broadening bands B, C, D and E. We simultaneously proposed selection criteria for smooth blasting parameters and the construction layout of broadening band B. Based on a regression analysis of the blasting vibration monitoring results, a spread orderliness of blasting vibration was drawn. Explosion parameters optimization measures were put forward, selected from the maximum charge quantity, millisecond blasting, reasonable blasting time difference, and the excavation plan. Field testing achieved satisfactory results. These findings will play an important role in guiding excavation blasting construction of tunnel projects and assuring the safety of ground buildings.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第11期1290-1295,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50674108)
国家创新研究群体基金资助项目(50621403)
关键词
隧道开挖
公路隧道
大跨度
光面爆破
参数选择
振动监测
tunnel excavation
highway tunnel
large-span
smooth blasting
parametric selection
vibrations monitoring
