特大断面隧道爆破开挖对既有隧道振动影响分析
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摘要
在分析国内外爆破振动理论的基础上阐述要根据具体的工况,有针对性地引入振动速度、振动时间等多种参数进行分析,且以兰渝线关子岭特大断面隧道爆破为依托,应用数值分析方法,模拟特大断面隧道爆破振动对周边建筑物的影响。研究结果表明:既有隧道仰拱迎爆侧附近应力最大;随着时间的推移,上部既有隧道最大拉应力依次出现在迎爆侧仰拱、拱脚、拱顶及背爆墙等位置,并且其强度经历由弱变强,又由强变弱后逐渐减小消失。根据分析结果提出在特大断面爆破施工中应采取的一系列减振施工技术措施,希望为以后遇到类似特大断面爆破施工提供参考。
It is stated,on basis of analysis on the blasting theories at home and abroad,that parameters,such as vibration velocity and vibration time should be introduced to analyze the influence of blasting on the surrounding structures.In the paper,the influence imposed by the blasting excavation of tunnels with extra-large cross-sections is simulated,with Guanziling tunnel on Lanzhou-Chongqing railway as an example.The study results indicate that the stress on the inverts toward the blasting side is the largest;as time goes on,the maximum tensile stress on the upper existing tunnel occurs at the invert,arch foot and crown toward the blasting and the wall backward the blasting in succession;the strength of the stresses varies from weak to strong,then varies from strong to weak and in the end vanishes gradually.A series of vibration-reducing measures are proposed on basis of the study results.The paper can be served as reference for similar projects in the future.
It is stated,on basis of analysis on the blasting theories at home and abroad,that parameters,such as vibration velocity and vibration time should be introduced to analyze the influence of blasting on the surrounding structures.In the paper,the influence imposed by the blasting excavation of tunnels with extra-large cross-sections is simulated,with Guanziling tunnel on Lanzhou-Chongqing railway as an example.The study results indicate that the stress on the inverts toward the blasting side is the largest;as time goes on,the maximum tensile stress on the upper existing tunnel occurs at the invert,arch foot and crown toward the blasting and the wall backward the blasting in succession;the strength of the stresses varies from weak to strong,then varies from strong to weak and in the end vanishes gradually.A series of vibration-reducing measures are proposed on basis of the study results.The paper can be served as reference for similar projects in the future.
引文
[1]梁波,高峰,欧阳天烽.兰渝线关子岭爆破方案[R].武汉:中交二航局,2009.
[2]Lysmer J..Kuhlemeyer RL Finite Dynamic Model for Infi-nite Media[J].J.ASCE,Eng.Mech.Div.,1969,95(4):857-877.
[3]陈无平,谢伟平,王国波.混凝土动弹模对地铁车站结构地震响应影响的分析[J].武汉工业学院学报,2008,27(1):65-68.
[4]郑永来,夏颂佑,周澄.岩土类材料的动弹性模量机理[J].振动与冲击,1997,16(2):56-61.
[5]Hsin Yu Low,Hong Hao.Reliability Analysis of ReinforcedConcrete Slabs Under Explosive Loading[J].Structural Safe-ty,2001(23):157-178.
[6]Batchelor B.G..Pattern Recognition Ideas in Practice[M].New York and London:Plenum Press,1986:262-265.
[7]刘国华,王振宇.爆破荷载作用下隧道的动态响应与抗爆分析[J].浙江大学学报:工学版,2004,38(2):204-208.
[8]杨永琦.矿山爆破技术与安全[M].北京:煤炭工业出版社,1991:59-63.
[9]刘津波,杜修力.结构动力学[M].北京:机械工业出版社,2005.
[10]GB 60772—2003爆破安全规程[S].北京:中国标准出版社,2003.
[2]Lysmer J..Kuhlemeyer RL Finite Dynamic Model for Infi-nite Media[J].J.ASCE,Eng.Mech.Div.,1969,95(4):857-877.
[3]陈无平,谢伟平,王国波.混凝土动弹模对地铁车站结构地震响应影响的分析[J].武汉工业学院学报,2008,27(1):65-68.
[4]郑永来,夏颂佑,周澄.岩土类材料的动弹性模量机理[J].振动与冲击,1997,16(2):56-61.
[5]Hsin Yu Low,Hong Hao.Reliability Analysis of ReinforcedConcrete Slabs Under Explosive Loading[J].Structural Safe-ty,2001(23):157-178.
[6]Batchelor B.G..Pattern Recognition Ideas in Practice[M].New York and London:Plenum Press,1986:262-265.
[7]刘国华,王振宇.爆破荷载作用下隧道的动态响应与抗爆分析[J].浙江大学学报:工学版,2004,38(2):204-208.
[8]杨永琦.矿山爆破技术与安全[M].北京:煤炭工业出版社,1991:59-63.
[9]刘津波,杜修力.结构动力学[M].北京:机械工业出版社,2005.
[10]GB 60772—2003爆破安全规程[S].北京:中国标准出版社,2003.
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