爆破震动作用下公路隧道动力特性分析
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摘要
基于小净间距的南方某公路隧道二期工程爆破震动安全监测,通过爆破震动作用隧道围岩与衬砌质点振动速度波频谱分析与质点振动速度幅值分布情况,对公路隧道混凝土衬砌及其围岩在爆破地震波作用下的力学性质特征进行论述,指导和优化爆破施工,为合理与有效保护隧道衬砌提供依据。
Based on monitoring of blasting vibration safety of the 2nd term engineering for a tunnel in Shengzhen city,which is a newly excavated tunnel close to the existing one on the condition of small clear spacing.Blasting vibration analysis of concrete lining tunnel is described by analyzing the peak particle velocity(PPV) and its main frequency.First,it is mentioned how to settle monitoring line and position according the principles,which are the principles of the position and direction of the maximum PPV,the principle of monitoring of blasting seismic effects,and the principle of the blasting vibration waves decay.Thent,he information and results of monitoring are giveni,n which results of blasting vibration velocity monitoring of different blasting methods are emphasized,and the attenuation formula of the PPV and explosives with distance between blasting center and monitoring position are obtained,and that the V-ρ relationship of blasting vibration is pointed out too.The results show that the maximum PPV appeared in radial direction and the position of the minimum distance between blasting center and monitoring position,and appeared in the center point of wall and the apex of arch in same section,and the main frequency is focused on 15-75 Hz which differs from various concrete linings,mainly 22-50 Hz.Finally,it is pointed out by analysis and discussion of the PPV and its main frequency of three kinds of blasting methods,which are semi-face blasting and bench stopping blasting and full-face blasting,that the PPV and its main frequency have close relation with explosive mode and distance between blasting center and monitoring position,and that degree of blasting seismic effects is affected mainly by distance and degree of blasting,and that full-face blasting is the best blasting method to control the blasting seismic effects.
Based on monitoring of blasting vibration safety of the 2nd term engineering for a tunnel in Shengzhen city,which is a newly excavated tunnel close to the existing one on the condition of small clear spacing.Blasting vibration analysis of concrete lining tunnel is described by analyzing the peak particle velocity(PPV) and its main frequency.First,it is mentioned how to settle monitoring line and position according the principles,which are the principles of the position and direction of the maximum PPV,the principle of monitoring of blasting seismic effects,and the principle of the blasting vibration waves decay.Thent,he information and results of monitoring are giveni,n which results of blasting vibration velocity monitoring of different blasting methods are emphasized,and the attenuation formula of the PPV and explosives with distance between blasting center and monitoring position are obtained,and that the V-ρ relationship of blasting vibration is pointed out too.The results show that the maximum PPV appeared in radial direction and the position of the minimum distance between blasting center and monitoring position,and appeared in the center point of wall and the apex of arch in same section,and the main frequency is focused on 15-75 Hz which differs from various concrete linings,mainly 22-50 Hz.Finally,it is pointed out by analysis and discussion of the PPV and its main frequency of three kinds of blasting methods,which are semi-face blasting and bench stopping blasting and full-face blasting,that the PPV and its main frequency have close relation with explosive mode and distance between blasting center and monitoring position,and that degree of blasting seismic effects is affected mainly by distance and degree of blasting,and that full-face blasting is the best blasting method to control the blasting seismic effects.
引文
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[11]Siskind E D.Frequency analysis and use of response spectra for blast vibration assessments in mining[A].In:Proceedings of the 22nd Annual Conference on Explosives and Blasting Technique(Volume II)[C].Orlando,USA:International Society of Explosives Engineering,1996.176–183.
[12]阳生权,刘宝琛.小线间距平行隧道爆破震动加速度测试[J].爆破器材,1999,28(6):1–4.(Yang Shengquan,Liu Baochen.Acceleration velocity monitoring of blasting vibration in little spacing tunnels construction[J].Explosive Materials,1999,28(6):1–4.(in Chinese))
[13]The Commission on Test Methods.Suggested method for blast vibration monitoring[J].International Journal of Rock Mechanics and Mining Sciences,1992,29(2):143–156.
[2]刘新荣,孙翔,蒋树屏,等.四车道公路隧道特点及其所需解决的几个问题[J].地下空间,2003,23(4):437–439.(Liu Xinrong,Sun Xiang,Jiang Shuping,et al.Characteristics of four-lane road tunnel and problems to be solved[J].Underground Space,2003,23(4):437–439.(in Chinese))
[3]何满潮,李春华,王树仁.大断面软岩硐室开挖非线性力学特性数值模拟研究[J].岩土工程学报,2002,24(4):483–486.(He Manchao,Li Chunhua,Wang Shuren.Research on the nonlinear mechanics characters of large section cavern excavating within soft rock by numerical simulation[J].Chinese Journal of Geotechnical Engineering,2002,24(4):483–486.(in Chinese))
[4]刘艳青,卢汝绥.软岩隧道围岩压力的位移直接反演方法的研究[J].土木工程学报,2001,34(1):84–87.(Liu Yanqing,Lu Rusui.Study on reverse displacement method of ground pressure for tunnels in soft rock[J].China Civil Engineering Journal,2001,34(1):84–87.(in Chinese))
[5]邓广哲.裂隙隧道围岩动态损伤特性分析[J].岩石力学与工程学报,2001,20(4):401–442.(Deng Guangzhe.Research on dynamic damage properties of jointed rock mass in surrounding strata[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(4):440–442.(in Chinese))
[6]中华人民共和国行业标准编写组.公路隧道设计规范(JTGD70–2004)[S].北京:人民交通出版社,2004.(The Professional Standards Compilation Group of People′s Republic of China.Code for Design of Road Tunnel(JTGD70–2004)[S].Beijing:China Communications Press,2004.(in Chinese))
[7]阳生权,廖先葵,刘宝琛.爆破地震安全判据的缺陷与改进[J].爆炸与冲击,2001,37(3):44–46,79.(Yang Shengquan,Liao Xiankui,Liu Baochen.Default of the judging standard of blasting vibration safety[J].Explosion and Shock Waves,2001,37(3):44–46,79.(in Chinese))
[8]Toshiki W,Koichi S.Velocity and amplitude of waves transmitted through fractured zones composed of multiple thin low-velocity layers[J].International Journal of Rock Mechanics and Mining Sciences,1995,32(4):313–324.
[9]Sharma J.Blasting induced vibration monitoring[J].The Indian Mining and Engineering Journal,1998,37(11):36–41.
[10]阳生权,刘宝琛.小线间距施工隧道爆破地震影响下既有围岩线性动力分析[J].工程爆破,1998,4(1):1–6.(Yang Shengquan,Liu Baochen.Linear dynamic analysis of the wall rock of existing tunnel affected by blasting vibration of new tunnel with little spacing[J].Engineering Blasting,1998,4(1):1–6.(in Chinese))
[11]Siskind E D.Frequency analysis and use of response spectra for blast vibration assessments in mining[A].In:Proceedings of the 22nd Annual Conference on Explosives and Blasting Technique(Volume II)[C].Orlando,USA:International Society of Explosives Engineering,1996.176–183.
[12]阳生权,刘宝琛.小线间距平行隧道爆破震动加速度测试[J].爆破器材,1999,28(6):1–4.(Yang Shengquan,Liu Baochen.Acceleration velocity monitoring of blasting vibration in little spacing tunnels construction[J].Explosive Materials,1999,28(6):1–4.(in Chinese))
[13]The Commission on Test Methods.Suggested method for blast vibration monitoring[J].International Journal of Rock Mechanics and Mining Sciences,1992,29(2):143–156.
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