摘要
采用现场测试和数值分析相结合的方法,研究了孤石深孔爆破对临近竖井结构振动影响。结果表明:减振孔可以有效减缓孤石爆破对竖井基坑围护桩的破坏;隔离孔可以保证相临爆区孤石的完整性;增加孤石爆破分区,减小炮孔间距,减少一次爆破量,可以有效控制竖井爆破振速。以孤石分区5区为例,将炮孔间距调整为0.5 m×0.4 m,炸药直径调整为32 mm,竖井监测点爆破振动速度可以控制在2 cm/s以内,保证临近结构物的安全性,且孤石爆破效果满足盾构掘进要求。
Field testing and numerical analysis were used to study the influence of boulder deep-hole blasting on the vibration of adjacent shaft.The results show that:vibration holes can effectively reduce damage on the retaining pile of foundation pit by boulder blasting;Isolation holes can guarantee the explosion integrity.The blasting vibration speed of shaft can be effectively controlled by increasing blasting area,reducing the distance between holes and reducing the amount of one blasting.Taking the 5 partitions of boulder as an example,the blasting vibration velocity can be controlled within 2 cm/s as the hole spacing was adjusted to 0.5 m×0.4 m and the explosive diameter was adjusted to 32 mm.As a result,the safety of adjacent structures was ensured,and the boulder blasting effect met the requirements of shield tunneling.
作者
张彪
ZHANG Biao(China Railway 23 rd Bureau Group Co.,Ltd.,Chengdu 610072,China)
出处
《爆破》
CSCD
北大核心
2021年第2期95-99,共5页
Blasting
基金
国家重点研发计划资助(2018YFC0808702)。
关键词
孤石
深孔爆破
竖井
减振措施
boulder
deep-hole blasting
shaft
vibration damping measures
