| 地铁车站开挖爆破地震波衰减特性监测分析 |
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| 作者单位： | ;1.中铁二十四局集团有限公司 |
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| 摘 要： | 为了控制下穿于建筑密集、交通流量大的重庆市主干道洪湖东路地铁车站,爆破开挖产生的爆破振动对围岩和施工周边环境的影响。对其产生的爆破振动进行了监测,并应用线性回归分析法对围岩质点振动速度峰值进行了统计分析,总结了该围岩中爆破地震波的衰减规律。根据开挖区域允许的爆破振动速度,计算其爆破施工安全许可的单段最大起爆药量为1.8kg,从而为车站开挖爆破设计和施工提供了理论指导。监测结果表明,在车站开挖爆破近区围岩中,垂直方向质点振动速度较大,随着比例距离的增加,垂直方向振动速度与水平方向振动速度趋于接近。
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| 关 键 词： | 地铁车站 钻爆开挖 振动监测 回归分析 衰减特性 爆破地震波 |
Analysis on attenuation characteristic of blasting seismic wave in subway station excavation |
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| Affiliation: | ,China Railway 24th Bureau Group Co.,Ltd. |
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| Abstract: | Because Chongqing Honghu Eastern Road subway station passes underneath urban trunk road with dense building and large traffic flow,the influence of blasting vibration resulted from drill-blast excavation on surrounding environment is the key and difficulty of construction safety control of the subway station.So it is necessary to monitor vibration caused by blasting excavation of metro station for studying its effects on surrounding rock and construction environment.Through statistic analysis of particles' peak vibration value of surrounding rock and the attenuation characteristic of blasting seismic are studied using linear regression analysis method.Permissible single maximum explosive charge for blasting excavation is calculated as 1.8 kg according to allowable blasting vibration velocity,thereby offering theoretical guidance of blasting design and construction of metro station.The monitoring results show that near blasting region the particles' vibration velocity at vertical direction in surrounding rock is larger,whereas especially close to the vibration velocity at horizontal direction with the increase of scaled distance. |
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| Keywords: | metro station drill-blast excavation vibration monitoring regression analysis attenuation characteristic blasting seismic wave |
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