水平与竖向地震作用下土工格栅加筋土挡墙动力分析
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摘要
应用动力弹塑性有限元方法,研究了各种设计参数对土工格栅加筋土挡墙动力响应的影响。应用了可以描述砂性土非线性静动力性能的弹塑性模型模拟填土;采用可以描述土工格栅在反复受载情况下滞回性质的边界面弹塑性模型模拟加筋层;土与结构的相互作用由一种可以描述界面滑移、脱开及闭合的有厚度薄层单元模拟。在有限元分析中同时考虑了水平与竖直两种地震激励。研究内容包括竖向地震影响、加筋长度、加筋层间隔、面板预制混凝土块重量、面板与填土界面摩擦角、预制混凝土块之间摩擦角等对加筋土挡墙变形、加筋层内力等的影响。
A sand model that was capable of simulating the pressure-dependency and cyclic hardening behavior of sandy soils was used to model the back-filled soil,and a bounding surface elasto-plastic model for geosynthetics that could capture the cyclic hysteresis of geogrids was used to model the reinforcement.Slip-elements were employed to describe the soil-structure interaction behavior in the geosynthetic-reinforced soil(GRS) retaining wall.Horizontal and vertical excitations were considered simultaneously in the analyses.The study was focused on the deformation of the retaining wall and the internal forces in the reinforcements and the object of study included the effects of the vertical excitation,the reinforcement length,the reinforcement spacing,the weight of the facing blocks,the frictions between soil and facing blocks as well as those between two facing blocks.
A sand model that was capable of simulating the pressure-dependency and cyclic hardening behavior of sandy soils was used to model the back-filled soil,and a bounding surface elasto-plastic model for geosynthetics that could capture the cyclic hysteresis of geogrids was used to model the reinforcement.Slip-elements were employed to describe the soil-structure interaction behavior in the geosynthetic-reinforced soil(GRS) retaining wall.Horizontal and vertical excitations were considered simultaneously in the analyses.The study was focused on the deformation of the retaining wall and the internal forces in the reinforcements and the object of study included the effects of the vertical excitation,the reinforcement length,the reinforcement spacing,the weight of the facing blocks,the frictions between soil and facing blocks as well as those between two facing blocks.
引文
[1]TATSUOKA F,TATEYAMA M,KOSEKI J.Behavior of Geogrid-reinforced soil retaining walls during the Great Habshin-Awaji Earthquake[C]//Proceedings of 1st International Symposium on Geotechnical Earthquake Engineering.1995:55–60.
[2]程火焰,周亦唐,钟国强.加筋土挡土墙地震动力特性研究[J].公路交通科技,2004,21(9):16–20.(CHENG Huo-yan,ZHOU Yi-tang,ZHONG Guo-qiang.Study on the seismic properties of the reinforced soil retaining wall[J].Journal of Highway and Transportation Research and Development,2004,21(9):16–20.)
[3]LING H,LIU H,KALIAKIN V,LESHCHINSKY D.Analyzing dynamic behavior of geosynthetic-reinforced soil retaining walls[J].Journal of Engineering Mechanics,ASCE,2004,130(8):911–920.
[4]刘华北,LING H.土工格栅加筋土挡土墙设计参数的弹塑性有限元研究[J].岩土工程学报,2004,26(5):668–673.(LIU Hua-bei,LING H.Elasto-plastic finite element study for parameters of geogrid-reinforced soil retaining wall[J].Chinese Journal of Geotechnical Engineering,2004,26(5):668–673.)
[5]LING H,LIU H.Pressure dependancy and densification behavior of sand through a generalized plasticity model[J].Journal of Engineering Mechanics,ASCE,2003,129(8):851–860.
[6]LING H I,LIU H,MOHRI Y,KAWABATA T.A bounding surface model for geogrid reinforcements[J].Journal of Engineering mechanics,ASCE,2001,127(9):963–967.
[7]CHAN A H C.User manual for DIANA SWANDYNE-II[R].Glasgow:University of Glasgow,1989.
[2]程火焰,周亦唐,钟国强.加筋土挡土墙地震动力特性研究[J].公路交通科技,2004,21(9):16–20.(CHENG Huo-yan,ZHOU Yi-tang,ZHONG Guo-qiang.Study on the seismic properties of the reinforced soil retaining wall[J].Journal of Highway and Transportation Research and Development,2004,21(9):16–20.)
[3]LING H,LIU H,KALIAKIN V,LESHCHINSKY D.Analyzing dynamic behavior of geosynthetic-reinforced soil retaining walls[J].Journal of Engineering Mechanics,ASCE,2004,130(8):911–920.
[4]刘华北,LING H.土工格栅加筋土挡土墙设计参数的弹塑性有限元研究[J].岩土工程学报,2004,26(5):668–673.(LIU Hua-bei,LING H.Elasto-plastic finite element study for parameters of geogrid-reinforced soil retaining wall[J].Chinese Journal of Geotechnical Engineering,2004,26(5):668–673.)
[5]LING H,LIU H.Pressure dependancy and densification behavior of sand through a generalized plasticity model[J].Journal of Engineering Mechanics,ASCE,2003,129(8):851–860.
[6]LING H I,LIU H,MOHRI Y,KAWABATA T.A bounding surface model for geogrid reinforcements[J].Journal of Engineering mechanics,ASCE,2001,127(9):963–967.
[7]CHAN A H C.User manual for DIANA SWANDYNE-II[R].Glasgow:University of Glasgow,1989.
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