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.
出处
《现代隧道技术》
EI
北大核心
2009年第6期48-52,63,共6页
Modern Tunnelling Technology
关键词
地铁隧道
下穿施工
爆破测试
频谱分析
衰减规律
Metro
Underpassing
Blasting measurement
Spectrum analysis
Attenuation law
