| 超小净距隧道爆破振动现场监测及动力响应分析研究 |
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| 引用本文： | 朱正国,孙明路,朱永全,孙星亮.超小净距隧道爆破振动现场监测及动力响应分析研究[J].岩土力学,2012,33(12):3747-3752. |
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| 作者姓名： | 朱正国 孙明路 朱永全 孙星亮 |
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| 作者单位： | 1.石家庄铁道大学 土木工程学院，石家庄 050043；2.武汉铁路局 武汉桥工段，武汉 430000 |
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| 基金项目： | 国家自然基金(No.51078243);河北省自然基金资助项目(No.E2012210011) |
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| 摘 要： | 以南京地铁超小净距隧道为工程背景，结合国内外现有研究成果和规范，研究确保小净距先行隧道安全稳定的后行隧道爆破施工控制技术。以现代信息化施工理论为依据，充分运用现场监控量测，对先行隧道爆破质点振动速度进行监测分析和施工中爆破采用减振和隔振两方面控制技术；最终现场监测结果表明，优化后的循环进尺、段最大装药量与分段爆破差等爆破参数设计合理，该爆破设计在施工中未对先行隧道安全产生较大影响；同时，通过三维数值模拟计算，得到先行隧道壁面的质点振动速度随时间的变化规律，所得最大振速符合规范要求，也再次验证了优化后的爆破设计是合理的。通过数据分析得出隧道边墙的切向和径向振速比拱脚相应振速大，爆破面前方先行洞衬砌受爆破振动的影响稍大于后方衬砌，临近爆破点的左线隧道衬砌表面振动大于远离爆破点的衬砌表面振动。该研究成果为本工程施工提供了科学依据与技术指导，也可为类似隧道工程的爆破掘进工程在理论和施工方法上提供参考借鉴。
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| 关 键 词： | 隧道工程 小净距隧道：爆破监测 数值模拟 |
| 收稿时间： | 2011-08-08 |
Field monitoring on blasting vibration and dynamic response of ultra-small spacing tunnels |
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| ZHU Zheng-guo,SUN Ming-lu,ZHU Yong-quan,SUN Xing-liang.Field monitoring on blasting vibration and dynamic response of ultra-small spacing tunnels[J].Rock and Soil Mechanics,2012,33(12):3747-3752. |
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| Authors: | ZHU Zheng-guo SUN Ming-lu ZHU Yong-quan SUN Xing-liang |
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| Institution: | 1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2. Wuhan Bridge Section, Wuhan Railway Bureau, Wuhan 430000, China |
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| Abstract: | Based on the background of ultra-small spacing tunnels of Nanjing Metro and combined with the existing research results as well as domestic and international codes, a method of blasting technology using in small spacing later tunnel is studied in order to keep the security and stability of the antecedent line. Using modern information technology theory as the basis and making full use of on-site monitoring, the vibration velocity of particle in antecedent tunnel can be monitored and analyzed for vibration reduction and vibration isolation during the blasting. The final results show that the blasting design parameters such as optimized footage driving cycle, the maximum loading dose and the time difference of sectional blasting are reasonable during the construction. The blasting design did not affect the safety of the antecedent tunnel. While through the three dimensional numerical simulation, after observing the variation of particle vibration in antecedent line over time, we find that the maximum vibration velocity meets the relevant codes; and the optimized blasting design is reasonable. Through numerical analysis, we find that the tangential and centripetal vibration velocity in tunnel side wall are much faster than the vibration velocity in arch springing, the effect in antecedent blasting surface is slight greater than the rear lining; and the surface vibration of lining in left tunnel which near blasting point is greater than the surface in blasting point. The research results to the construction of this protect provide a scientific basis and technical guidance for similar future tunnel blasting excavation engineering and construction methods in theory. |
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| Keywords: | tunnel engineering small spacing tunnels blast monitoring numerical simulation |
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