超近接铁路隧道数码雷管错相减振技术应用  

Application of Digital Detonator Staggered-phase Vibration Abatement Technology in Railway Tunnels with Ultra-close Spacing

作　　者：王立川 张学民[2] 吴海宝[3] 周贤舜 练发胜 张鹏 何军 周上进 WANG Lichuan;ZHANG Xuemin;WU Haibao;ZHOU Xianshun;LIAN Fasheng;ZHANG Peng;HE Jun;ZHOU Shangjin(China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222;School of Civil Engineering,Central South University,Changsha 410075;Guiyang Public Transportation Investment and Operation Group Co.,Ltd.,Guiyang 550081;China Railway Chengdu Group Co.,Ltd.,Chengdu 610082)

机构地区：[1]中铁十八局集团有限公司,天津300222 [2]中南大学土木工程学院,长沙410075 [3]贵阳市公共交通投资运营集团有限公司,贵阳550081 [4]中国铁路成都局集团有限公司,成都610082

出　　处：《现代隧道技术》2022年第3期236-245,共10页Modern Tunnelling Technology

基　　金：中铁十八局集团有限公司科技研发项目(G21-14);国家自然科学基金(51978671);中国铁路成都局集团有限公司科研项目(ZX1707).

摘　　要：在非爆开挖进度极其缓慢的白岩脚隧道泄水廊道抢险工程中,引入数码电子雷管错相减振技术,显著提高了隧道掘进进尺,有效控制了距正洞结构6.1~15.9 m的爆破施工对正洞的影响。依托四次持续改进性爆破施工方案试验,确定了(超)近接铁路隧道电子雷管逐孔起爆的优化设计参数:复式楔形掏槽按“对称、双层、对应、压抬”布孔,掏槽孔单孔药量0.9 kg,设置孔间延时7 ms。同时发现,数码电子雷管引爆产生的地震波信号以超高频带(>200 Hz)为主,且主频越高则振速越低。四次爆破测试的振动主频带向高频发展且分布更加均匀,可有效避免低频振动对隧道结构的损伤。For the drainage gallery urgent remediation project of the Baiyanjiao Tunnel,where the non-blasting excavation was making an extremely slow progress,the application of digital electronic detonator staggered-phase vibration abatement technology significantly improved the excavation progress and effectively controlled the impact of blasting(6.1 to 15.9 meters from the main tunnel structure)on the main tunnel.Based on four tests of continuously improved blasting schemes,the study determined the optimized design parameters of electronic detonator detonation in railway tunnels with(ultra)close spacing:the layout of double wedge-shaped cut holes followed the"symmetrical,double-layer,corresponding,confining and lifting"principles,with 0.9 kg charge for each hole and an interhole time delay of 7 minutes.It was also found that the seismic wave signal generated by the detonation of digital electronic detonator was dominated by ultra-high frequency bands(>200 Hz),and the higher the leading frequency was,the lower the vibration velocity would be.The leading frequency bands of vibration in the four blast tests showed a tendency toward a high frequency and a more even distribution,which could effectively avoid damage to the tunnel structure from low-frequency vibration.

关 键 词：高速铁路 错相减振 现场试验 数码电子雷管 复式楔形掏槽 主振频率 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]