下穿密集居民区地铁隧道施工爆破测试及安全评价
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摘要
针对深圳地铁2号线站后折返线隧道下穿密集居民区且采用矿山法施工的情况,采用爆破震动仪对施工爆破进行了测试。根据测试结果,对爆破震速在装药量(或爆心距)一定时与爆心距(或装药量)的关系,以及震速时程曲线和频谱进行了分析研究;通过萨道夫斯基经验公式对地震波的衰减规律进行了回归分析,得到了测试条件下的场地系数(K)和地震波衰减指数(α)值,从而反演得到任意质点震速峰值的预测公式及单段最大装药量的控制计算公式;并采用震速-频率安全判据对测试结果进行了安全性评价。结果表明:已实施的施工爆破满足规范要求,不会对各测试建筑物造成破坏。
Considering the reverse track at Shijiezhichuang station of Shenzhen metro Line 2 underpassing densely populated areas, blasting vibration velocities were measured. According to the test results, the relationship between blasting vibration velocities and charge weights (or blast center distances) was obtained. Under given blast center distance (or charge weight), vibration velocity vs. time curves and spectrum were also analyzed. By Sadaovski empirical formula regression analysis, the values of K,α were obtained. Then the formulas of PPVV for predicting the particle peak vibration velocity at any point and the allowable charge weight for a single blast were established. Safety evaluation according to vibration velocity-frequency criterion was conducted. Results indicated that construction blasting met standard requirements, and structures were safe during blasting.
Considering the reverse track at Shijiezhichuang station of Shenzhen metro Line 2 underpassing densely populated areas, blasting vibration velocities were measured. According to the test results, the relationship between blasting vibration velocities and charge weights (or blast center distances) was obtained. Under given blast center distance (or charge weight), vibration velocity vs. time curves and spectrum were also analyzed. By Sadaovski empirical formula regression analysis, the values of K,α were obtained. Then the formulas of PPVV for predicting the particle peak vibration velocity at any point and the allowable charge weight for a single blast were established. Safety evaluation according to vibration velocity-frequency criterion was conducted. Results indicated that construction blasting met standard requirements, and structures were safe during blasting.
引文
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[3]方俊波,崔天麟.浅埋地铁区间爆破震动对地表建筑物的影响[J].现代隧道技术,2000,(5):28～31Fang Junbo,Cui Tianlin.Vibration Effect of Shallow Buried Metro Running Tunnel Blasting on Surface Structures[J].Modern Tunnelling Technology,2000,(5):28～31
[4]雷明锋,张运良,彭立敏.城市小间距交通隧道爆破安全监测及结果分析[J].现代隧道技术,2007,44(1):61～64Lei Mingfeng,Zhang Yunliang,Peng Limin.Blast Monitoring and Analyses for Urban Traffic Tunnels with Small Spacing[J].Modern Tunnelling Technology,2007,44(1):61～64
[5]舒西刚,刘新荣等.歌乐山石灰石矿爆破地震波的测试与分析[J].地下空间与工程学报,2008,4(3):586～590Shu Xigang,Liu Xinrong.Test and Analysis on Blasting Seismic Wave of Geleshan Limestone Mine[J].Chinese Journal of Underground Space and Engineering,2008,4(3):586～590
[6]朱赞成,徐化祥.广州地铁三号线连拱隧道微震爆破设计[J].爆破,2007,24(3):110～113Zhu Zancheng,Xu Huaxiang.Design of Slight Vibration Blasting for Buried Excavation for No3Multiple-arch Tunnel in Guangzhou[J].Blasting,2007,24(3):110～113
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[8]唐春海,于亚伦,王建宙.爆破地震动安全判据的初步探讨[J].有色金属,2001,53(1):1～4Tang Chunhai,Yu Yalun,Wang Jianzhou.Elementary Study of Safety Criterion for Blasting Vibration[J].Nonferrous Metals,2001,53(1):1～4
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