地基液化条件下沉箱码头变形非线性数值分析
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摘要
针对液化土体大变形易引起沉箱码头破坏问题,基于有效应力分析法,采用Flac3D内嵌的Byrne本构关系为砂土液化模型,对1995年日本阪神地震中沉箱码头进行完全非线性有限差分数值模拟,分别从码头残余变形、超孔压比、应力应变等方面探讨沉箱码头地基液化特性和破坏机理。结果表明,该模型能较好地模拟可液化土体的动力特性,数值计算与震害调查结果较吻合,与置换砂土液化相比,回填砂土液化对沉箱破坏影响更大。
The large deformation of soil liquefaction can lead to destruction of the caisson wharf.Based on the effective stress analysis method,Byrne constitutive model for sand liquefaction built-in Flac3D is used to make a fully nonlinear finite difference numerical simulation of the caisson wharf during the 1995 Kobe earthquake in Japan to explore wharf foundation liquefaction characteristics and failure mechanism from residual deformation,the excess pore water pressure reaction and stress-strain respectively.The results show that Byrne model is capable of simulating liquefied soil dynamic characteristics;numerical calculation results are consistent with the damage survey;it is more influence of backfill soil liquefaction than replacement sand to caisson wharf failure.
The large deformation of soil liquefaction can lead to destruction of the caisson wharf.Based on the effective stress analysis method,Byrne constitutive model for sand liquefaction built-in Flac3D is used to make a fully nonlinear finite difference numerical simulation of the caisson wharf during the 1995 Kobe earthquake in Japan to explore wharf foundation liquefaction characteristics and failure mechanism from residual deformation,the excess pore water pressure reaction and stress-strain respectively.The results show that Byrne model is capable of simulating liquefied soil dynamic characteristics;numerical calculation results are consistent with the damage survey;it is more influence of backfill soil liquefaction than replacement sand to caisson wharf failure.
引文
[1]王桂萱,陈雄,宋力.地震荷载沉箱码头大变形分析的离散元法初探[J].海洋工程,2004,22(4):131-136.
[2]刘晓,唐小微,栾茂田.地基液化导致沉箱码头破坏及地基加固方法的非线性数值分析[J].防震减灾工程学报,2004,29(5):518-523.
[3]马硕,罗奇峰.日本阪神地震中海港码头、河流堤岸的震害及其教训[J].灾害学,1998,13(4):47-50.
[4]山本裕介,张至镐,滨田政则,等.护岸移动に伴う液状化地盘の地表面流动量に关する研究[A].早稻田大学大学院.土木学会第58回年会论文集[C].东京:早稻田大学大学院,2003:225-226.
[5]刘汉龙,井合进,一井康二.大型沉箱式码头岸壁地震反应分析[J].岩土工程学报,1998,20(2):26-30.
[6]方云,东烟郁生,Ghalandarzadeh A,等.地震液化条件下重力式码头的变形破坏机理[J].中国地质大学学报,2001,26(4):415-418.
[7]Byrne P M.A Cyclic Shear-volume Coupling and Pore-pressure Model for Sand[A].Second International Con-ference on Recent Advances in Geotechnical EarthquakeEngineering and Soil Dynamics[C].Rolla,Missour:University of Missouri,1991:47-55.
[8]陈育民,徐鼎平.FLAC&FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[2]刘晓,唐小微,栾茂田.地基液化导致沉箱码头破坏及地基加固方法的非线性数值分析[J].防震减灾工程学报,2004,29(5):518-523.
[3]马硕,罗奇峰.日本阪神地震中海港码头、河流堤岸的震害及其教训[J].灾害学,1998,13(4):47-50.
[4]山本裕介,张至镐,滨田政则,等.护岸移动に伴う液状化地盘の地表面流动量に关する研究[A].早稻田大学大学院.土木学会第58回年会论文集[C].东京:早稻田大学大学院,2003:225-226.
[5]刘汉龙,井合进,一井康二.大型沉箱式码头岸壁地震反应分析[J].岩土工程学报,1998,20(2):26-30.
[6]方云,东烟郁生,Ghalandarzadeh A,等.地震液化条件下重力式码头的变形破坏机理[J].中国地质大学学报,2001,26(4):415-418.
[7]Byrne P M.A Cyclic Shear-volume Coupling and Pore-pressure Model for Sand[A].Second International Con-ference on Recent Advances in Geotechnical EarthquakeEngineering and Soil Dynamics[C].Rolla,Missour:University of Missouri,1991:47-55.
[8]陈育民,徐鼎平.FLAC&FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
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