波浪作用下海床孔隙水压力发展过程与液化的数值分析
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摘要
为了探讨波浪作用下海床的液化特性与孔隙水压力发展过程,本文在海床动力响应弹性分析的基础上,将不排水条件下孔压增长模式与动力固结方程相结合,对波浪作用下海床中瞬态与残余孔隙水压力的发展过程与变化规律进行了有限元模拟与分析;对善功企与山崎浩之所提出的海床液化评判准则进行了修正,根据所估算的总孔隙水压力,对波浪作用下海床的液化势进行了评价。
In order to clarify the mechanism of wave induced liquefaction of seabed,numerical analysis based on elastic theory is carried out to evaluate dynamic response of seabed under wave loading.The empirical pattern of pore pressure generation of sand under undrained cyclic shearing is incorporated with Biot's coupling equations which governing vibration and consolidation coupling effects of seabed.A numerical procedure based on FEM is developed to assess the residual pore pressure.The criterion for assessment of liquefaction triggering proposed by Zen and Yamazaki is revised and then the revised criterion is employed to predict the liquefaction potential of the seabed on the basis of computed pore pressure.
In order to clarify the mechanism of wave induced liquefaction of seabed,numerical analysis based on elastic theory is carried out to evaluate dynamic response of seabed under wave loading.The empirical pattern of pore pressure generation of sand under undrained cyclic shearing is incorporated with Biot's coupling equations which governing vibration and consolidation coupling effects of seabed.A numerical procedure based on FEM is developed to assess the residual pore pressure.The criterion for assessment of liquefaction triggering proposed by Zen and Yamazaki is revised and then the revised criterion is employed to predict the liquefaction potential of the seabed on the basis of computed pore pressure.
引文
[1] ZenK,YamazakiH.Mechanismofwave inducedliquefactionanddensificationinseabed[J].SoilsandFoundations,1990,30(4):90-104.—99—
[2] BiotMA.Generaltheoryofthree dimensionalconsolidation[J].JournalofAppliedPhysics,1941,12:155-164.
[3] 徐志英,沈珠江.土坝地震孔隙水压力产生、扩散和消散的有限单元法动力分析[J].华东水利学院学报,1981,4:1-16.
[4] 沈珠江,徐志英.1976年7月28日唐山地震时密云水库白河主坝有效应力动力分析[J].水利水运科学研究,1981,3:46-63.
[5] SeedHB,MartinPP,LysmerJ.Pore waterpressurechangesduringsoilliquefaction[J].JournalofGeotechnicalEngineering,ASCE,1976,102(GT4):323-346.
[6] SeedHB,RahmanMS.Wave inducedporepressureinrelationtooceanfloorstabilityofcohesionlesssoils[J].MarineGeotechnology,1978,3(2):123-150.
[7] 沈瑞福,王洪瑾,周克骥,周景星.动主应力旋转下砂土孔隙水压力发展及海床稳定性判断[J].岩土工程学报,1994,16(3):70-78.
[8] ZienkiewiczOC,PaulDK,ChanAHC.Unconditionallystablestaggeredsolutionproceduresforcoupledsoil porefluiddynamicproblem[J].InternationalJournalforNumericalandAnalyticalMethodsinGeomechanics,1988,26:1039 1055.
[9] JengDS.Soilresponseincros anisotropicseabedduetostandingwaves[J].JournalofGeotechnicalandGeoenvironmentalEngineering,ASCE,1997,123(1):9-19.
[10] 王栋,栾茂田,郭莹.波浪作用下海床动力反应有限元数值模拟与液化分析[J].大连理工大学学报,2001,41(2):216-222.
[11] 王栋.波浪作用下海床动力响应与液化的数值分析[D].大连:大连理工大学,2002.
[2] BiotMA.Generaltheoryofthree dimensionalconsolidation[J].JournalofAppliedPhysics,1941,12:155-164.
[3] 徐志英,沈珠江.土坝地震孔隙水压力产生、扩散和消散的有限单元法动力分析[J].华东水利学院学报,1981,4:1-16.
[4] 沈珠江,徐志英.1976年7月28日唐山地震时密云水库白河主坝有效应力动力分析[J].水利水运科学研究,1981,3:46-63.
[5] SeedHB,MartinPP,LysmerJ.Pore waterpressurechangesduringsoilliquefaction[J].JournalofGeotechnicalEngineering,ASCE,1976,102(GT4):323-346.
[6] SeedHB,RahmanMS.Wave inducedporepressureinrelationtooceanfloorstabilityofcohesionlesssoils[J].MarineGeotechnology,1978,3(2):123-150.
[7] 沈瑞福,王洪瑾,周克骥,周景星.动主应力旋转下砂土孔隙水压力发展及海床稳定性判断[J].岩土工程学报,1994,16(3):70-78.
[8] ZienkiewiczOC,PaulDK,ChanAHC.Unconditionallystablestaggeredsolutionproceduresforcoupledsoil porefluiddynamicproblem[J].InternationalJournalforNumericalandAnalyticalMethodsinGeomechanics,1988,26:1039 1055.
[9] JengDS.Soilresponseincros anisotropicseabedduetostandingwaves[J].JournalofGeotechnicalandGeoenvironmentalEngineering,ASCE,1997,123(1):9-19.
[10] 王栋,栾茂田,郭莹.波浪作用下海床动力反应有限元数值模拟与液化分析[J].大连理工大学学报,2001,41(2):216-222.
[11] 王栋.波浪作用下海床动力响应与液化的数值分析[D].大连:大连理工大学,2002.
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