浅埋偏压隧道开挖爆破振动与控制技术.docxVIP

孙西濛1 ，高文学2 ，李志星1 ，邓洪亮3 ，叶春琳1 ，魏鹏巍3( 1 . 北京市公路桥梁建设集团有限公司，北京 100068 ;2 . 北京工业大学工程城市与工程安全 减灾教育部重点实验室，北京 100124 ;3 . 北京工业大学建筑工程学院，北京 100124 )［摘要］以密兴路改建工程火郎峪隧道工程为背景，进行掘进爆破地表振动监测与控制技术研究。 监 测 与 分 析 结果表明:① 沿隧道横断面，偏压浅埋处地表振速最大;沿隧道开挖方向，自成洞区向未开挖区地表振速呈现递减趋 势;② 将大楔形掏槽改为多级小楔形掏槽，爆破振动效应与破岩效果得到有效改善;③ 合理布置掏槽位置，可 以 有 效减少掏槽孔爆破对隧道偏压浅埋处的振动影响;④ 全面监控浅埋偏压隧道掘进爆破振动及其效应，优 化 爆 破 参 数，既能有效控制爆破振害，又能保证较大循环进尺。［关键词］浅埋偏压隧道;爆破开挖;振动监测;控制技术［中图分类号］U459. 2［文献标识码］A［文章编号］1002 -8498 (2011 )03 -0051 -03Excavation Blasting Vibration and Control Technology ofShallow Tunnel Under Unsymmetrical PressureSun Ximeng1 ，Gao Wenxue2 ，Li Zhixing1 ，Deng Hongliang3 ，Ye Chunlin1 ，Wei Pengwei3(1. Beijing Roads and Bridges Construction Group Corporation Limited，Beijing 100068 ，China;2. The Key Laboratoryof Urban Security and Disaster Engineering，Ministry of Education，Beijing University of Technology，Beijing 100124 ，China;3. The College of Architecture and Civil Engineering，Beijing University of Technology，Beijing 100124 ，China)Abstract: Basing on Huolangyu tunnel in Mixing road reconstruction project， the authors researchmonitoring and control technologies of ground surface vibration when the tunnel is excavated by blasting method. The monitoring and analysis results show as follow: 1 ) The maximum ground surface vibration locates at the shallow and unsymmetrical position along tunnel cross section. The ground surface vibration decline from constructed position to unconstructed position along tunnel excavation direction. 2 ) The optimum blast design that the multi-stage small wedge cutting holes replaces the big wedge cutting holes improves blasting vibration and rock fragmentation. 3 ) Reasonable cutting holes position reduces the blasting disturbance of shallow and unsymmetrical position. 4 ) Comprehensively monitoring blasting vibration and optimized blasting parameter will reduce blasting vibration impact and assure large circulation constructio