近距离交叉隧洞爆破对既有隧道的振动影响
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摘要
结合南山下隧洞下穿温福客运专线钱仓山隧道工程,实时监测近距离交叉隧洞爆破施工对既有隧道的振动影响。实测结果表明,(1)迎爆面位置影响既有隧道断面的爆破振动速度分布;震源距离测点大于30m时,距离是爆破振动的主要影响因素;震源距离测点小于30m时,主要影响因素则为装药量与距离。(2)岩体越坚硬完整,爆破振动波传播衰减越慢。采用导洞先行预留光面爆破、导洞爆破掏槽眼和周边眼及底板眼分开起爆、控制最大段装药量等措施,可有效地降低爆破振动影响,控制其对钱仓山隧道的影响,对类似工程有借鉴作用。
Based on the engineering that Nanshanxia Tunnel down-traversing Qiancangshan Tunnel of Wen-Fu Passenger Dedicated Line,the vibration effects on the existing tunnel caused by blasting of an adjacent cross tunnel have been monitored.The results of the tests show that: the position of blasting surface affects velocity distribution of the cross-section of existing tunnel;when the distance between vibration source and measuring points is more than 30 m,the main influence factor of vibration is distance;while it is less than 30 m,the main factors are the amount of dynamite and distance;the harder and more complete the rock is,the slower the attenuation of the propagation of blasting vibration wave is.Measures such as pilot tunnel blasting in advance of smooth blasting;pilot tunnel blasting that the initiation of cutting holes,periphery holes and bottom holes are separated;and controlling maximum explosive volume for single segment can weaken the impact of blasting vibration effectively and control the vibration effects on Qiancangshan Tunnel;it can be a reference for similar projects.
Based on the engineering that Nanshanxia Tunnel down-traversing Qiancangshan Tunnel of Wen-Fu Passenger Dedicated Line,the vibration effects on the existing tunnel caused by blasting of an adjacent cross tunnel have been monitored.The results of the tests show that: the position of blasting surface affects velocity distribution of the cross-section of existing tunnel;when the distance between vibration source and measuring points is more than 30 m,the main influence factor of vibration is distance;while it is less than 30 m,the main factors are the amount of dynamite and distance;the harder and more complete the rock is,the slower the attenuation of the propagation of blasting vibration wave is.Measures such as pilot tunnel blasting in advance of smooth blasting;pilot tunnel blasting that the initiation of cutting holes,periphery holes and bottom holes are separated;and controlling maximum explosive volume for single segment can weaken the impact of blasting vibration effectively and control the vibration effects on Qiancangshan Tunnel;it can be a reference for similar projects.
引文
[1]孙永义.南山下隧洞设计方案报告[R].温州:温州市水利电力勘测设计院,2008.
[2]杨新安.钱仓山隧道监测方案[R].上海:上海天佑咨询工程有限公司、同济大学,2008.
[3]杨新安.钱仓山隧道监测成果报告[R].上海:上海天佑咨询工程有限公司、同济大学,2009.
[4]杜菊红,黄宏伟.偏压、错台小间距隧道施工位移场动态模拟分析[J].岩土力学,2009,30(4):1102-1108.DU Ju-hong,HUANG Hong-wei.Dynamic simulation analysis of displacement field of bias closely spaced tunnel with altitude difference[J].Rock and Soil Mechanics,2009,30(4):1102-1108.
[5]彭道富,李献忠,杨年华.近距离爆破对既有隧道的影响[J].中国铁道科学,2005,26(4):73-76.PENG Dao-fu,LI Xian-zhong,YANG Nian-hua.Vibration effect on the working tunnel induced by an adjacent blasting[J].China Railway Science,2005,26(4):73-76.
[6]高晓初,吴子俊.运营隧道小间距平行隧道开挖爆破安全控制[C]//工程爆破文集(第六集).深圳:海天出版社,1997.
[7]林学义,王兰民.隧洞的爆破地震动效应问题[C]//工程爆破文集(第六集).深圳:海天出版社,1997.
[8]GOGIO BERTA.Blasting-induced vibration in tunnel[J].Tunneling and Underground Space Technology,1994,9(2):175-187.
[9]南山下隧洞交叉段爆破设计方案[R].湖州:核工业井巷建设公司,2008.
[10]国家质量监督检验检疫总局.GB6722-2003爆破安全规程[S].北京:中国标准出版社,2003.
[2]杨新安.钱仓山隧道监测方案[R].上海:上海天佑咨询工程有限公司、同济大学,2008.
[3]杨新安.钱仓山隧道监测成果报告[R].上海:上海天佑咨询工程有限公司、同济大学,2009.
[4]杜菊红,黄宏伟.偏压、错台小间距隧道施工位移场动态模拟分析[J].岩土力学,2009,30(4):1102-1108.DU Ju-hong,HUANG Hong-wei.Dynamic simulation analysis of displacement field of bias closely spaced tunnel with altitude difference[J].Rock and Soil Mechanics,2009,30(4):1102-1108.
[5]彭道富,李献忠,杨年华.近距离爆破对既有隧道的影响[J].中国铁道科学,2005,26(4):73-76.PENG Dao-fu,LI Xian-zhong,YANG Nian-hua.Vibration effect on the working tunnel induced by an adjacent blasting[J].China Railway Science,2005,26(4):73-76.
[6]高晓初,吴子俊.运营隧道小间距平行隧道开挖爆破安全控制[C]//工程爆破文集(第六集).深圳:海天出版社,1997.
[7]林学义,王兰民.隧洞的爆破地震动效应问题[C]//工程爆破文集(第六集).深圳:海天出版社,1997.
[8]GOGIO BERTA.Blasting-induced vibration in tunnel[J].Tunneling and Underground Space Technology,1994,9(2):175-187.
[9]南山下隧洞交叉段爆破设计方案[R].湖州:核工业井巷建设公司,2008.
[10]国家质量监督检验检疫总局.GB6722-2003爆破安全规程[S].北京:中国标准出版社,2003.
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