地震荷载作用下桩承式加筋路堤动力响应分析
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摘要
桩承式加筋路堤具有工期短,成本低以及沉降变形小等优点,在工程中得到了广泛应用。为了研究地震荷载作用下桩承式加筋路堤的动力特性,建立了桩承式加筋路堤的数值分析动力模型,分析了水平地震波El-Centro作用下桩承式加筋路堤的动力响应。同时,研究了路堤加速度、动剪应力和路堤动位移等动力特性,分析了CFG桩和土工格栅的内力峰值分布。最后,对土工格栅抗拉模量和桩间距进行了参数分析,研究了水平地震荷载作用下土工格栅抗拉模量和桩间距对桩承式加筋路堤动力响应特性的影响。数值分析结果表明:桩承式加筋路堤在右坡面接近坡脚处,剪切应变增量最大;增大格栅抗拉模量能增强桩承式加筋路堤的抗震性能,而且对增强竖向地震稳定性比水平向地震稳定性效果更明显。
Geosynthetic reinforced and pile supported(GRPS) embankment has been constructed increasingly owing to its rapid construction,low cost,and small total and differential settlement.In order to investigate the dynamic behaviors of GRPS embankment under the seismic loads,the dynamic model are conducted using FLAC.This paper focuses on the dynamic response of the embankment under the horizontal earthquake wave of El-Centro.Simultaneously,the acceleration,dynamic shear stress and displacement have also been studied,so does the peak distribution of internal force in the CFG piles and geosynthetic.Finally,the key influencing factors including the tensile stiffness of geosynthetic and the pile spacing have been analyzed on the dynamic response of GRPS embankment under seismic loads.The result shows that the greatest increment of the shearing strain is at the right embankment toe.The tensile stiffness of the geosynthetic has a significant influence on the anti-seismic performance of GRPS embankment.
Geosynthetic reinforced and pile supported(GRPS) embankment has been constructed increasingly owing to its rapid construction,low cost,and small total and differential settlement.In order to investigate the dynamic behaviors of GRPS embankment under the seismic loads,the dynamic model are conducted using FLAC.This paper focuses on the dynamic response of the embankment under the horizontal earthquake wave of El-Centro.Simultaneously,the acceleration,dynamic shear stress and displacement have also been studied,so does the peak distribution of internal force in the CFG piles and geosynthetic.Finally,the key influencing factors including the tensile stiffness of geosynthetic and the pile spacing have been analyzed on the dynamic response of GRPS embankment under seismic loads.The result shows that the greatest increment of the shearing strain is at the right embankment toe.The tensile stiffness of the geosynthetic has a significant influence on the anti-seismic performance of GRPS embankment.
引文
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[2]Abusharar S W,Zheng J J,Chen B G.A simplifiedmethod for analysis of a piled embankment reinforcedwith geosynthetics[J].Geotextiles and Geomem-branes,2009,27(1):39-52.
[3]张军,郑俊杰,马强.路堤荷载下双向增强体复合地基受力机理分析[J].岩土工程学报,2010,32(9):1392-1398.
[4]Quang T S,Ghazi H,Patrick D B.Seismic stability a-nalysis of piled embankments:A multiphase approach[J].International Journal for Numerical and Analyti-cal Methods in Geomechanics,2010,34:91-110.
[5]刘飞禹,余炜,杨凤云,等.桩承式加筋路堤三维动力流固耦合分析[J].土木建筑与环境工程,2011,33(3):45-51.
[6]刘飞禹,张乐,余炜,等.交通荷载作用下桩承式加筋路堤性能分析[J].土木工程学报,2011,44(s2):50-54.
[7]李旭华.从日本地震看我国公路工程抗震设计[J].山西交通科技,2011,212(5):18-19.
[8]黄培敏.土工格栅加筋土特性实验与抗震技术研究[D].成都:西南交通大学,2010.
[9]王建,姚令侃,吴伟.路堤震害模式及路堤动力特性研究[J].岩土力学,2010,31(12):3801-3808.
[10]袁捷,曾四平,祝云琪,等.地震作用下加筋土路基力学行为的弹塑性分析[J].同济大学学报(自然科学版),2008,36(4):483-487.
[11]陈育民,仉文岗,刘汉龙.堤防地震液化数值模拟及动力反应分析[J].解放军理工大学学报(自然科学版),2011,12(3):239-224.
[12]王建,姚令侃,陈强.汶川地震路堤成灾模式及土工格栅加筋变形[J].岩石力学与工程学报,2010,29(1):3387-3394.
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