地铁风井狭窄深基坑精细化爆破施工及监测分析

Fine Blasting Construction and Monitoring Analysis of Narrow and Deep Foundation Pit of Subway Air Shaft

依托广州地铁18号线番禺广场—南村万博区间中间风井深基坑爆破工程,介绍了常规爆破结合静态爆破的精细化设计,并综合考虑震源距离及最小抵抗线的影响,对基坑周边建筑物所受的爆破振动进行监测。监测结果表明:振动速率及频率均在限值以内,说明所采用的方法可以有效地减小爆破对周边环境的影响。

Relying on the blasting engineering of the deep foudation pit of the middle air shaft between Panyu Square and Nancun Wanbo section of Guangzhou metro line 18,this paper first introduces the fine design of conventional blasting combined with static blasting,and then comprehensively considers the impact of hypocentral distance and minimum resistance line and monitors the blasting vibration of the buildings surrounding the foundation pit.The monitoring results showed that vibration rate and frequeney were within the limit value,which indicates that the method adopted can effectively reduce the impact of blasting on the surrounding environment.