饱和砂土地基中群桩侧向动力响应试验与数值模拟对比研究
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摘要
可液化场地中桩基尤其是群桩的横向动力响应特性的研究,一直是国内外岩土地震工程领域关注的热点问题。由于桩-土-承台结构动力相互作用过程的复杂性,基于砂土-群桩-承台结构模型振动台试验,对饱和砂土中群桩侧向动力响应特性进行了分析。在此基础上,通过大型有限元软件OpenSees建立了三维模型,展开了数值模拟研究,并将数值模拟结果与试验结果进行了对比研究。结果表明:在正弦波输入下,无论是干砂还是饱和砂土试验,群桩承台加速度和位移时程与模拟承台加速度和位移时程在曲线趋势和峰值上基本吻合;在El-Centro地震波输入下,干砂和饱和砂土的模拟承台加速度时程曲线峰值和趋势与试验的比较吻合,而承台位移时程曲线频率比试验要高,但承台位移峰值基本一致。
The research of pile foundation in liquefiable site,especially the research of lateral dynamic response characteristics of pile group has been a concern in the field of geotechnical earthquake engineering at home and abroad. Based on the complexity of dynamic interaction process of group-soil-pile caps,in this article,the lateral dynamic response characteristics of pile groups through the shaking table test which use the model of soil-pile group-caps structure were analysed. On this basis,a three dimensional model of liquefied soil was established to carry out the numerical simulation of pile group dynamic response with the finite element software OpenSees. The results of numerical simulation and experiment analyses results were compared. Comparison results show that under the sine wave input,whatever dry sand or saturated sand test,the acceleration and displacement time history of pile-group cap are basicly in agreement with those from numerical simulation; In El Centro earthquake wave input,for dry or saturated sand test,the trend and peak of acceleration time history curve of simulation of piles cap are consistent with those of experiment. However the frequency of displacement time history curve of pile caps is of higher than that of test,but the peak displacement of pile caps is almost the same for both test and simalation.
The research of pile foundation in liquefiable site,especially the research of lateral dynamic response characteristics of pile group has been a concern in the field of geotechnical earthquake engineering at home and abroad. Based on the complexity of dynamic interaction process of group-soil-pile caps,in this article,the lateral dynamic response characteristics of pile groups through the shaking table test which use the model of soil-pile group-caps structure were analysed. On this basis,a three dimensional model of liquefied soil was established to carry out the numerical simulation of pile group dynamic response with the finite element software OpenSees. The results of numerical simulation and experiment analyses results were compared. Comparison results show that under the sine wave input,whatever dry sand or saturated sand test,the acceleration and displacement time history of pile-group cap are basicly in agreement with those from numerical simulation; In El Centro earthquake wave input,for dry or saturated sand test,the trend and peak of acceleration time history curve of simulation of piles cap are consistent with those of experiment. However the frequency of displacement time history curve of pile caps is of higher than that of test,but the peak displacement of pile caps is almost the same for both test and simalation.
引文
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[11]CHAN,ELGAMAL A.Nonlinear modeling of largr-scale ground-foundation-structure seismic response[J].Journal of Earthquake Technology,2007,44(2):325-339.
[12]吴大国.液化场地群桩地震响应有效应力分析[D].合肥:合肥工业大学,2007.WU Daguo.Effective stress analysis of seismic responses of pile groups in liquefiable soils[D].Hefei:Hefei University of Technology,2007.(in Chinese)
[13]徐鹏举.可液化场地桥梁桩基地震反应分析与简化分析方法研究[D].哈尔滨:哈尔滨工业大学,2011.XU Pengju.Seismic response analysis and simplified method of bridge pile foundation in liqiuefiable ground[D].Harbin:Harbin Institute of Technology.2011.(in Chinese)
[2]王维铭,袁晓铭,孟上九,等.汶川8.0级地震液化特征初步研究[J].地震工程与工程振动,2011,31(4):137-142.WANG Weiming,YUAN Xiaoming,MENG Shangjiu,et al.Liquefaction characteristics in Chengdu region in Ms 8.0 Wenchuan Earthquake[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(4):137-142.
[3]李兆焱,袁晓铭,曹振中,.基于新疆巴楚地震调查的砂土液化判别新公式[J].岩土工程学报,2012,34(3):483-489.LI Zhaoyan,YUAN Xiaoming,CAO Zhengzhong,et al.New evaluation formula for sand liquefaction based on survey of Bachu Earthquake in Xinjiang[J].Chinese Journal of Geotechnical Engineering,2012,34(3):483-489.
[4]陈龙伟,袁晓铭,孙锐.2011年新西兰Mw6.3地震液化及岩土震害评述[J].世界地震工程,2013,29(3):1-9.CHEN Longwei,YUAN Xiaoming,SUN Rui.Review of liquefaction phenomena and geotechnical damage in the 2011 New Zealand Mw6.3 earthquake[J].World Earthquake Engineering,2013,29(3):1-9.
[5]汪云龙,袁晓铭,殷建华.基于光纤光栅传感技术的测量模型土体侧向变形一维分布的方法[J],岩土工程学报,2013,35(10):1908-1913.WANG Yunlong,YUAN Xiaoming,YIN Jianhua.A method of measurement on the 1-D distribution of soil Interior lateral deformation in Shaking table test using FBG technique[J].Chinese Journal of Geotechnical Engineering,2013,35(10):1908-1913.
[6]李雨润,张中乐,魏星,等.FBG传感系统在桩基侧向动力响应中的应用研究[J].地震工程与工程振动,2013,33(2):185-191.LI Yurun,ZHANG Zhongle,WEI Xing,et al.Research on lateral dynamic responses of pile foundations by using FBG sensing system[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(2):185-191.
[7]李雨润,孙伟民,张建华,等.地震作用下群桩水平动力响应特性及P-Y曲线试验研究[J].地震工程学报,2014,36(3):468-475.LI Yurun,SUN Weimin,ZHANG Jianhua,et al.Experimental Study of Horizonta l Dynamic Response and P-Y Curves of Piles during Earthquakes[J].China Earthquake Engineering Journal,2014,36(3):468-475.
[8]李雨润,王小燕,罗祥.基于FLAC3D液化土中桩基侧向动力特性数值模拟研究[J].建筑结构,2015,45(21):70-73.LI Yurun,WANG Xiaoyan,LUO Xiang.The numerical simulation study for lateral dynamic characteristics of pile foundation in liquefied soil based on FLAC3D[J].Journal of Building Structures,2015,45(21):70-73.
[9]凌贤长,徐鹏举,于恩庆,等.液化场地桩-土-桥梁结构地震相互作用振动台试验数值模拟方法研究[J].地震工程与工程振动,2008,(28)3:172-177.LING Xianzhang,XU Pengju,YU Enqing,et al.Numerical simulation of shaking table test for seismic pile-soil-bridge structure interactionon liquefied ground[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(3):172-177.
[10]Ruggiero E J,Singler J,Burns J A,et al.Finite Element Formulation for Static Shape Control of a Thin Euler-Bernoulli Beam Using Piezoelectric Actuators[C]//.Proceedings of 2004 ASME Internatsional Mechanical Engineering Congress and Exposition,Anaheim,California,2004:1-8.
[11]CHAN,ELGAMAL A.Nonlinear modeling of largr-scale ground-foundation-structure seismic response[J].Journal of Earthquake Technology,2007,44(2):325-339.
[12]吴大国.液化场地群桩地震响应有效应力分析[D].合肥:合肥工业大学,2007.WU Daguo.Effective stress analysis of seismic responses of pile groups in liquefiable soils[D].Hefei:Hefei University of Technology,2007.(in Chinese)
[13]徐鹏举.可液化场地桥梁桩基地震反应分析与简化分析方法研究[D].哈尔滨:哈尔滨工业大学,2011.XU Pengju.Seismic response analysis and simplified method of bridge pile foundation in liqiuefiable ground[D].Harbin:Harbin Institute of Technology.2011.(in Chinese)