侧压力系数对海底隧道爆破效应影响数值分析
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摘要
以拟建的某海底隧道工程为背景,采用FLAC对隧道掘进钻爆引起的震动效应进行了数值模拟。将爆破荷载以等效应力的方式加载于模拟炮孔之上,根据围岩类型和岩层覆盖厚度设计值选取典型的隧道断面进行模拟计算;提取出影响围岩稳定性的关键点位置的峰值振速及加速度值。数值模拟结果表明,各关键节点的振动速度、加速度均小于相应规范要求的临界值,因此选取的爆破参数满足爆破工程稳定性和安全性要求。同时,总结出侧压力系数对水平方向和垂直方向的振动效应的影响。
By taking a subsea tunnel to be constructed as the research object,the ground vibration induced by blasting is analyzed numerically using FLAC.The explosive load is imposed on simultated surrounding blast holes with equivalent stress.A typical segment is chosen according to different surrounding rock types and rock cover thickness;peak values of velocity and acceleration of the key points affecting the stability of the rocks surrounding are taken.The result of simulation indicates that the level and vertical rapidity peak values satisfy those of subsea tunnel failure criterion,so the blasting parameters for calculation can satisfy the requirements of stability and security in subsea.At the same time,the influence of lateral pressure coefficient on vibration effects of both horizontal and vertical direction is generalized.
By taking a subsea tunnel to be constructed as the research object,the ground vibration induced by blasting is analyzed numerically using FLAC.The explosive load is imposed on simultated surrounding blast holes with equivalent stress.A typical segment is chosen according to different surrounding rock types and rock cover thickness;peak values of velocity and acceleration of the key points affecting the stability of the rocks surrounding are taken.The result of simulation indicates that the level and vertical rapidity peak values satisfy those of subsea tunnel failure criterion,so the blasting parameters for calculation can satisfy the requirements of stability and security in subsea.At the same time,the influence of lateral pressure coefficient on vibration effects of both horizontal and vertical direction is generalized.
引文
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[16]顾义磊,李晓红,杜云贵,等.隧道光面爆破参数的确定[J].重庆大学学报(自然科学版),2005,28(3):95-97.(Gu Yilei,Li Xiaohong,Du Yungui,eta1.Reasonable smooth blasting factor used in tunnel[J].Journal of Chongqing University(Natural ScienceEdition),2005,28(3):95-97.(in Chinese))
[17]邵国建,卓家寿,章青.岩体稳定性分析与评判准则研究[J].岩石力学与工程学报,2003,22(5):691-696.(Shao Guojian,Zhuo Jiashou,Zhang Qing.Re-search on analysis method and criterion of rockmassstability[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(5):691-696.(in Chinese))
[18]李玉民,倪芝芳.地下工程开挖爆破的地面振动特征[J].岩石力学与工程学报,1997,16(3):274-278.(Li Yuming,Ni Zhifang.The characteristics onsurface vibration of blasting in underground engineer-ing[J].Chinese Journal of Rock Mechanics and Engi-neering,1997,16(3):274-278.(in Chinese))
[2]龙源,冯长根,徐全军,等.爆破地震波在岩石介质中传播特性与数值计算研究[J].工程爆破,2000,6(3):1-7.(Long Yuan,Feng Changgen,Xu Quanjun,eta1.Study on propagation characteristics of blastingseismic waves in rock medium and numerical calculation[J].Engineering Blasting,2000,6(3):1-7.(inChinese))
[3]夏祥,李俊如,李海波,等.爆破荷载作用下岩体振动特征的数值模拟[J].岩土力学,2005,26(1):50-56.(Xia Xiang,Li Junru,Li Haibo,et a1.Udec modelingof vibration characteristics of jointed rock mass underexplosion[J].Rock and Soil Mechanics,2005,26(1):50-56.(in Chinese))
[4]李云鹏,艾传志,韩常领,等.小间距隧道爆破开挖动力效应数值模拟研究[J].爆炸与冲击,2007,27(1):75-81.(Li Yunpeng,Ai Chuanzhi,Hao Changling,eta1.Study on dynamics effect caused by blastingconstruction by numerical simulation for tunnels withsmall spacing[J].Explosion and Shock Waves,2007,27(1):75-81.(in Chinese))
[5]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):204-209.(Liu Guohua,Wang Zhenyu.Dynamicresponse and blast-resistance analysis of a tunnelsubjected to blast loading[J].Journal of ZhejiangUniversity(Engineering Science),2004,38(2):204-209.(in Chinese))
[6]张欣,李术才.爆破荷载作用下青岛胶州湾海底隧道覆盖岩层稳定性分析[J].岩石力学与工程学报,2007,26(11):2 348-2 355.(Zhang Xin,Li Shucai.Stability analysis of rock cover of Qingdao Kiaochowbaysubsea tunnel under explosive loads[J].ChineseJournal of Rock Mechanics and Engineering,2007,26(11):2 348-2 355.(in Chinese))
[7]陈士海,王明洋,赵跃堂,等.岩石爆破破坏界面上的应力时程研究[J].岩石力学与工程学报,2003,22(11):1 784-1 788.(Chen Shihai,Wang Mingyang,Zhao Yuetang,et a1.Time-stress history on interfacebetween cracked and uncracked zones under rock blasting[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(11):1 784-1 788.(in Chinese))
[8]刘招伟.爆破动静应力场对隧道的稳定分析[J].世界隧道,2000(4):65-67.(Liu Zhaowei.Analysis ofthe influence of dynamic and static stress field due toblasting on the stability of tunnel[J].World Tunnel,2000(4):65-67.(in Chinese))
[9]PREECE D S,THORNE B J.A study of detonationtiming and fragmentation using 3-D finite elementtechniques and a damage constitutive model[C]∥RockFragmentation by Blasting.Rotterdam:A.A.Balkema,1996:147-156.
[10]DOWDING C H,AIMONE C T.Multiple blast-holestresses and measured fragmentation[J].RockMechanics and Rock Engineering,1985,18:17-36.
[11]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4 259-4 265.(Li Liang,ZhangBingqiang,Yang Xiaoli.Analysis of dynamic responseof large cross-section tunnel under vibrating loadinduced by high speed train[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(23):4259-4 265.(in Chinese))
[12]SHARPE J A.The production of elastic waves byexplosion pressures:I.theory and empirical fieldobservations[J].Geophysics,1942,7(2):144-154.
[13]孙钧.海底隧道工程设计施工若干关键技术的商榷[J].岩石力学与工程学报,2006,25(8):1 513-1 521.(Sun Jun.Discussion on some key technical is-sues for design and construction of undersea tunnels[J].Chinese Journal of Rock Mechanics and Engineer-ing,2006,25(8):1 513-1 521.(in Chinese))
[14]郑大榕.南京地铁隧道爆破开挖与振动控制[J].铁道工程学报,2004,(3):73-75.(Zheng Darong.Ex-cavation by blasting and vibration control of tunnel inNanjing subway[J].Journal of Railway EngineeringSociety,2004,(3):73-75.(in Chinese))
[15]刘加尧.临近既有线的新隧道开挖爆破减震技术[J].工程爆破,2000,6(2):77-81.(Liu Jiayao.Blasting vibration-reduction technologies for excavationof a new tunnel close by existing railway tunnel[J].Engineering Blasting,2000,6(2):77-81.(in Chi-nese))
[16]顾义磊,李晓红,杜云贵,等.隧道光面爆破参数的确定[J].重庆大学学报(自然科学版),2005,28(3):95-97.(Gu Yilei,Li Xiaohong,Du Yungui,eta1.Reasonable smooth blasting factor used in tunnel[J].Journal of Chongqing University(Natural ScienceEdition),2005,28(3):95-97.(in Chinese))
[17]邵国建,卓家寿,章青.岩体稳定性分析与评判准则研究[J].岩石力学与工程学报,2003,22(5):691-696.(Shao Guojian,Zhuo Jiashou,Zhang Qing.Re-search on analysis method and criterion of rockmassstability[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(5):691-696.(in Chinese))
[18]李玉民,倪芝芳.地下工程开挖爆破的地面振动特征[J].岩石力学与工程学报,1997,16(3):274-278.(Li Yuming,Ni Zhifang.The characteristics onsurface vibration of blasting in underground engineer-ing[J].Chinese Journal of Rock Mechanics and Engi-neering,1997,16(3):274-278.(in Chinese))
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