加筋格宾挡墙地震反应与动土压力分析
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摘要
通过大型的模型试验,研究了以红砂岩为填料在水平地震作用下加筋格宾挡土墙的地震反应。输入不同类型和幅值的地震波激励,探讨地震作用下模型挡墙的动力特性与动力响应规律。试验结果表明,加筋格宾结构为优良的抗震结构,其墙内对输入加速度有明显的放大效应。沿墙高方向水平加速度放大倍数的增量坡度比较平缓,随着墙高的增大,水平加速度有增大的趋势。墙内各质点对ELCE_NS地震波的水平加速度放大倍数为1~1.88倍,对HACHI_EW地震波的放大倍数为1~2.78倍。墙面板的水平加速度放大倍数随振幅增大呈现明显的递减趋势,变化基本上为线性的。竖向加速度峰值响应在墙面及墙顶显著增大,可达到台面水平加速度峰值的44%~56%。推导了加筋格宾挡墙在水平地震荷载作用下的竖向动土压力的振动方程。
Large model tests were conducted on reinforced gabion walls filled with red sandstone under horizontal seismic loading to investigate the seismic response of walls.A series of tests were performed with different input seismic wave types and amplitudes.The dynamic characteristics and dynamic responses of model wall under horizontal seismic loading were discussed.Results show that reinforced gabion structure is an excellent anti-seismic structure.There is significant amplification effect of input acceleration in reinforced gabion walls.The increment slope of horizontal acceleration magnification times is flatter with the wall height.With the height of wall increases,there is an augmentation trend to horizontal acceleration.The magnification of lateral acceleration for each particle in wall is 1~1.88 under ELCE_NS loading,and 1～2.78 under HACHI_EW loading.The magnification factors of lateral acceleration tend to decrease with the increase of amplitude,and the whole change shows a roughly linear pattern.Vertical acceleration peaks both in the wall face and at the top of the wall increase greatly,reaching about 44% to 56% of lateral acceleration peak of table.The vibration equation of vertical dynamic earth pressure of reinforced gabion wall under horizontal seismic loading is also derived.
Large model tests were conducted on reinforced gabion walls filled with red sandstone under horizontal seismic loading to investigate the seismic response of walls.A series of tests were performed with different input seismic wave types and amplitudes.The dynamic characteristics and dynamic responses of model wall under horizontal seismic loading were discussed.Results show that reinforced gabion structure is an excellent anti-seismic structure.There is significant amplification effect of input acceleration in reinforced gabion walls.The increment slope of horizontal acceleration magnification times is flatter with the wall height.With the height of wall increases,there is an augmentation trend to horizontal acceleration.The magnification of lateral acceleration for each particle in wall is 1~1.88 under ELCE_NS loading,and 1～2.78 under HACHI_EW loading.The magnification factors of lateral acceleration tend to decrease with the increase of amplitude,and the whole change shows a roughly linear pattern.Vertical acceleration peaks both in the wall face and at the top of the wall increase greatly,reaching about 44% to 56% of lateral acceleration peak of table.The vibration equation of vertical dynamic earth pressure of reinforced gabion wall under horizontal seismic loading is also derived.
引文
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[10]Liu Huabei.Analysis on seismic behavior of geogrid-rein-forced retaining wall subjected to horizontal and vertical ex-citations[J].Chinese Journal of Geotechnical Engineering,2006,28(5):594-599.[刘华北.水平与竖向地震作用下土工格栅加筋土挡墙动力分析[J].岩土工程学报,2006,28(5):594?599.]
[11]Ling HI,Liu H,Mohri Y.Parametric studies on the behav-ior of reinforced soil retaining walls under earthquake load-ing[J].Journal of Engineering Mechanics,ASCE,2005,131(10):1056-1065.
[12]Ling H I,Mohri Y,Leshchinsk Y D,et al.Large-scaleshaking table tests on modular-block reinforced-soil retai-ning walls[J].Journal of Geotechnical and Geoenvironmen-tal Engineering,ASCE,2005,131(4):465-476.
[13]Yang Guolin,Li Haishen,Wang Yonghe.Model test on re-inforced earth retaining wall under cyclic loading[J].ChinaCivil Engineering Journal,2003,36(6):105-110.[杨果林,李海深,王永和.加筋土挡墙动力特性模型试验与动力分析[J].土木工程学报,2003,36(6):105-110.]
[14]Li Haishen,Yang Guolin,Zou Yinsheng.Analysis of dy-namic character of reinforced earth retaining wall[J].Chi-na Journal of Highway and Transport,2004,17(2):28-32.[李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-32.]
[2]Elms D G,Richards R.Seismic design of retaining walls de-sign and performance of earth retaining structures[C]//Lambe R C,Hansen L A,Ed.GT Pub 25.New York:ASCE.1990:2314-2318.
[3]Richards R J,Elms D.Seismic behavior of reinforced earthwalls[R].New Zealand:Dept of Civil Engineering,Uni-versity of Canterbury,1985.
[4]Fairless G J.Seismic performance of reinforced earth walls[D].New Zealand:University of Canterbury,Christ-church,1989.
[5]Belal A M,George K P.Finite element analysis of rein-forced soil retaining walls subjected to seismic loading[C]//12thWCEE,2000:1-8.
[6]Kutter B L,Casey J A,Romstad K M.Centrifuge modelingand field observations of dynamic behavior of reinforced soiland concrete cantilever retaining walls[C]//Proceedings of4th US National Conference on Earthquake Engineering.Palm Springs,CA,2001:1563-1569.
[7]Elgamal AW M,Alampalli S,Earthquake response of retai-ning walls.Full scale testing and computational analysis[C]//10thWorld Conference Earthquake Engineering.Rotterdam:Balkena,1992:1671-1676.
[8]El-Emam MM,Bathurst R J,Hatami K.Numerical model-ing of reinforced soil retaining walls subjected to base accel-eration[C]//13thWCEE.Canada:Vancouver,B C,2004:2621-2624.
[9]Cheng Huoyan,Zhou Yitang,Zhong Guoqiang.Study on theseismic properties of the reinforced soil retaining wall[J].Journal of Highway and Transportation Research and Devel-opment,2004,21(9):16-20.[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.]
[10]Liu Huabei.Analysis on seismic behavior of geogrid-rein-forced retaining wall subjected to horizontal and vertical ex-citations[J].Chinese Journal of Geotechnical Engineering,2006,28(5):594-599.[刘华北.水平与竖向地震作用下土工格栅加筋土挡墙动力分析[J].岩土工程学报,2006,28(5):594?599.]
[11]Ling HI,Liu H,Mohri Y.Parametric studies on the behav-ior of reinforced soil retaining walls under earthquake load-ing[J].Journal of Engineering Mechanics,ASCE,2005,131(10):1056-1065.
[12]Ling H I,Mohri Y,Leshchinsk Y D,et al.Large-scaleshaking table tests on modular-block reinforced-soil retai-ning walls[J].Journal of Geotechnical and Geoenvironmen-tal Engineering,ASCE,2005,131(4):465-476.
[13]Yang Guolin,Li Haishen,Wang Yonghe.Model test on re-inforced earth retaining wall under cyclic loading[J].ChinaCivil Engineering Journal,2003,36(6):105-110.[杨果林,李海深,王永和.加筋土挡墙动力特性模型试验与动力分析[J].土木工程学报,2003,36(6):105-110.]
[14]Li Haishen,Yang Guolin,Zou Yinsheng.Analysis of dy-namic character of reinforced earth retaining wall[J].Chi-na Journal of Highway and Transport,2004,17(2):28-32.[李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-32.]
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