摘要
以正在建设中的青岛地铁一期工程M3号线为背景,采用现场测试和数值模拟分析相结合的方法系统研究了地铁隧道爆破地表振动效应随埋深的变化规律。结果表明:花岗岩地层地铁隧道爆破施工存在满足安全经济综合最优要求的合理埋深范围;爆源正上方地表质点峰值振速在隧道埋深12 m以前随隧道埋深增加急剧衰减,埋深达18 m以后随埋深增加振速变化不显著;爆破振动空洞效应随隧道埋深增加空洞效应逐渐降低;爆破振动效应随爆破掏槽药量增大而增大,增加相同药量,埋深越大,增幅越小;随隧道断面尺寸增加而减小,增加相同断面,埋深越大,减幅越小。
This study is based on the first phase of the Qingdao subway project which is under construction, and the law of vibration effects of ground resulted from blasting in metro tunnels varying with buried depth is systematically researched by using simulated numerically method and site test. The results show that： there is a reasonable scope of metro tunnel in granite stratum that satisfies the optimal requirement of vibration effects of ground together with the safety and financial conditions;when the depth is less than 12 m, velocities of particles that are just above the source of explosive decrease quickly with the tunnel depth increasing,however,when the depth is more than 18 m,the effect is not obvious ;The effect of blasting hole is gradually reducing with the depth increasing;velocities of explosive increase with dosage of explosive increasing, when adding the same dosage of explosive, the more the depth is, the smaller the range is. Velocities of explosive decrease with the cross dimensions increasing, while adding the same cross dimensions, the more the depth is, the smaller the range is.
出处
《四川建筑科学研究》
北大核心
2015年第2期115-119,共5页
Sichuan Building Science
关键词
地铁隧道
爆破
地表振动效应
埋深
metro tunnel
explosive
vibration effects of ground
buried depth
