穿风化槽山岭隧道地震响应分析
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摘要
为探讨水平地震荷载激励下穿越风化槽山岭隧道衬砌结构的动力响应规律,建立三维有限差分模型进行非线性动力时程分析,并对比分析了不同风化槽土性参数条件下衬砌结构的动力响应峰值;然后,着重论述了风化槽与隧道横断面倾角对隧道结构物地震动力响应的影响;最后,分析了注浆加固层参数与二次衬砌参数对隧道结构内力峰值的影响。结果表明:风化槽倾角的增大有利于位移响应的减小,在倾角增大到某个值时,二次衬砌内力峰值可以达到最小;风化槽模量的增加会使衬砌内力增大;注浆层模量的增大在一定程度上有助于隧道衬砌内力峰值及振幅的减小;二次衬砌模量的增大会显著增加隧道的内力峰值及内力波动幅度。
To investigate the influence laws of seismic excitation on tunnel structures passing through a weathered ditch,a three-dimensional elastoplastic numerical simulation model is established and a time history nonlinear analysis is performed.Then a parametric study is conducted to compare the peak values of dynamic responses of liners under different conditions of the properties of the weathered ditch.And the influence of angle between the weathered ditch and the tunnel transection on the seismic responses of tunnel structures is investigated.Finally,the effects of property of grouting layer and secondary liner on the peak values of structure internal forces are studied.The results show that increasing the ditch angle is helpful in reducing the displacement of ground.The peak values of internal forces of secondary liner can be minimized by setting the ditch angle to a certain value.The internal force of liners increases as the modulus of the weathered ditch increases.The increasing modulus of grouting layer to some extent diminishes the internal force of liners.When the modulus of secondary liner increases,both the peak values and amplitude of fluctuation of internal force increase.
To investigate the influence laws of seismic excitation on tunnel structures passing through a weathered ditch,a three-dimensional elastoplastic numerical simulation model is established and a time history nonlinear analysis is performed.Then a parametric study is conducted to compare the peak values of dynamic responses of liners under different conditions of the properties of the weathered ditch.And the influence of angle between the weathered ditch and the tunnel transection on the seismic responses of tunnel structures is investigated.Finally,the effects of property of grouting layer and secondary liner on the peak values of structure internal forces are studied.The results show that increasing the ditch angle is helpful in reducing the displacement of ground.The peak values of internal forces of secondary liner can be minimized by setting the ditch angle to a certain value.The internal force of liners increases as the modulus of the weathered ditch increases.The increasing modulus of grouting layer to some extent diminishes the internal force of liners.When the modulus of secondary liner increases,both the peak values and amplitude of fluctuation of internal force increase.
引文
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[2]Konagai K,Kim D S.Simple evaluation of the effectof seismic isolation by covering a tunnel with a thinflexible material[J].Soil Dynamics and EarthquakeEngineering,2001,21(4):287-295.
[3]Bobet A.Effect of pore water pressure on tunnel sup-port during static and seismic loading[J].Tunnelingand Underground Space technology,ASCE,2003,18(4):58-65.
[4]Bobet A.Drainded and undrained response of deeptunnels subjected to far-field shear loading[J].Tunne-ling and Underground Space Technology,1996,25(1):21-31.
[5]Shahrour I,Khoshnoudian F,Sadek M.Elastoplasticanalysis of the seismic response of tunnels in soft soils[J].Tunneling and Underground Space Technology,2010,25(4):478-482.
[6]高峰,石玉成,严松宏,等.隧道的两种减震措施研究[J].岩石力学与工程学报,2005,24(2):222-229.Gao F,Shi Y Ch,Yan S H,et al.Study of two shockabsorption measures in tunnel[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(2):222-229.
[7]方林,宋林俐.穿越断层破碎带隧道减震措施研究[J].公路,2010,(2):194-197.Fang L,Song L L.Research on vibration absorptionmeasures of tunnel through fault[J].Highway,2010,(2):194-197.
[8]丁俊宏,金先龙,郭毅之,等.盾构隧道地震响应的三维数值模拟方法及应用[J].岩石力学与工程学报,2006,25(7):1430-1436.Ding J H,Jin X L,Guo Y Zh,et al.Three dimen-sional numerical simulation method and its applicationto seismic response of shield tunnel[J].Chinese Jour-nal of Rock Mechanics and Engineering,2006,25(7):1430-1436.
[9]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及其试验验证[J].岩土工程学报,2007,29(12):1816-1822.Liu G L,Song E X,Liu H B.Numerical modeling ofsubway tunnels in liquefiable soil under earthquakesand verification by centrifuge tests[J].Chinese Journalof Geotechnical Engineering,2007,29(12):1816-1822.
[10]黄茂松,曹杰.隧道地震响应简化模型分析与动力离心试验验证[J].岩石力学与工程学报,2010,29(2):272-280.Huang M S,Cao J.Simplified analysis of tunnelearthquake response and centrifuge modeling calibra-tion[J].Chinese Journal of Rock Mechanics and Engi-neering,2010,29(2):272-280.
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