FBG传感系统在桩基侧向动力响应中的应用研究
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摘要
液化土体中桩基侧向动力响应一直是目前岩土工程界和地震工程领域关注的热点研究问题之一。本文基于振动台实验,首次将光纤布拉格光栅(FBG)技术应用到液化土体桩基侧向动力响应分析方法中。实验结果表明:采用FBG传感系统可以测得桩身侧向动力响应,与传统电阻式应变片法相比简洁方便;FBG测量土体位移同样有效可行,可代替以往加速度积分求解土体位移;后处理得到的桩基侧向动力p-y滞回曲线能更好地反映桩土之间真实的动力本构关系,并与干砂动力p-y曲线相比,探讨两种不同场地条件下桩基侧向动力响应机制与p-y曲线的发展变化模式,为以后液化土中桩基侧向动力响应问题的研究奠定了理论基础。
Lateral dynamic responses of pile foundations in liquefiable soil is one of the important research problems in the geotechnical field and the field of earthquake engineering.Based on the shaking table test,the Fiber Bragg Grating(FBG) technology was applied for the first time to the liquefied soil and pile dynamic response analysis method.The experimental results show that: the results of experimental data are more accurate and reliable than that of the traditional method by using strain gauge measurement method;the soil displacement measureed by using FBG is feasible.There is great innovation compared with the soil displacement derived from the previous acceleration integration.Real constitutive relations of soil and pile could be well reflected from post-calculation of the lateral dynamic p-y hysteresis curve.The model of dynamic p-y curve is investigated during the liquefaction process through camparing with dry sand condition and theoretical foundation is established for the future study.
Lateral dynamic responses of pile foundations in liquefiable soil is one of the important research problems in the geotechnical field and the field of earthquake engineering.Based on the shaking table test,the Fiber Bragg Grating(FBG) technology was applied for the first time to the liquefied soil and pile dynamic response analysis method.The experimental results show that: the results of experimental data are more accurate and reliable than that of the traditional method by using strain gauge measurement method;the soil displacement measureed by using FBG is feasible.There is great innovation compared with the soil displacement derived from the previous acceleration integration.Real constitutive relations of soil and pile could be well reflected from post-calculation of the lateral dynamic p-y hysteresis curve.The model of dynamic p-y curve is investigated during the liquefaction process through camparing with dry sand condition and theoretical foundation is established for the future study.
引文
[1]唐亮,液化场地桩-土动力相互作用p-y曲线模型研究[D].哈尔滨:哈尔滨工业大学,2010.TANG Liang,P-Y model of dynamic pile-soil interaction in liquefying ground[D].Harbin:Harbin Institute of Technology,2010.(in Chinese)
[2]冯士伦.可液化土层中桩基横向承载特性研究[D].天津:天津大学,2004.FENG Shilun.The research on the lateral bearing behavior of the pile foundation in liquefiable soil[D].Tianjin:Tianjin University,2004.(in Chi-nese)
[3]Wang Yunlong,Yuan Xiaoming,Li Yurun,et al,Frequency response characteristic of a flexible FBG sensing beam for measuring dynamic LateralDisplacement of Soil in Shaking Table Tests[J].Advanced Materials Research,2012,446-449:1551-1554.(in Chinese)
[4]李雨润,袁晓铭,梁艳.桩-液化相互作用p-y曲线修正计算方法研究[J].岩土工程学报,2009,31(4):595-599.LI Yurun,YUAN Xiaoming,LIANG Yan,Modified calculation method of p-y curves for liquefied soil-pile interaction[J].Chinese Journal ofGeotechnical Engineering,2009,31(4):595-599.(in Chinese)
[5]陈旭光,张强勇,段抗,等.基于光栅传感的模型测量系统应用研究[J].岩土力学,2012,33(5):1409-1415.CHEN Xuguang,ZHANG Qiangyong,Duan Kang,et al.Research on application of optical sensor-based measuring method to model test[J].Rock and Soil Mechanics,2009,33(5):1409-1415.(in Chinese)
[6]李雨润.液化土层中桩基横向动力响应研究[D].哈尔滨:中国地震局工程力学研究所,2006.LI Yurun.Study on lateral dynamic response of pile foundation in liquefiable soil[D].Harbin:Institute of Engineering Mechanics,China Earth-quake Administration,2006(in Chinese)
[7]李雨润,魏星,梁艳,等.液化土-桩-承台结构横向动力响应分析方法研究综述[J].地震工程与工程振动,2012,32(3),180-186.LI Yurun,WEI Xing,LIANG Yan,et al.State-of-art of study on dynamics interaction of liquefiable soil-pile-cap structure[J].Journal of Earth-quake Engineering and Engineering Vibration,2012,32(3),180-186.(in Chinese)
[8]曹振中,李雨润,徐学燕,等.德阳松柏村典型液化震害剖析[J].岩土工程学报,2012,24(3):546-551.CAO Zhenzhong,LI Yurun,XU Xueyan et al.Typical case study of liquefaction-induced damage at Songbai village following Wenchuan Earthquake[J].Chinese Journal of Geotechnical Engineering,2012,24(3):546-551.(in Chinese)
[9]李雨润,袁晓铭,李帆.基于API规范的液化土层桩基p-y曲线修正计算公式[J].地震工程与工程振动,2010.12,30(6):11-16.LI Yurun,YUAN Xiaoming,LI Fan.Modified formula for calculating the p-y curves of pile foundation in liquefied soil layer based on the API code[J].Journal of Earthquake Engineering and Engineering Vibration,2010,12,30(6):11～16.(in Chinese)
[10]LI Yurun,LIANG Yan,WEI Xing.A new method for dynamic p-y curves of pile-cap structure in layered soil,(EI).[C]//2012 International Con-ference on Vibration,Structural Engineering and Measurement,vols.Advanced Materials Research,2012,226-228:1089-1093.
[2]冯士伦.可液化土层中桩基横向承载特性研究[D].天津:天津大学,2004.FENG Shilun.The research on the lateral bearing behavior of the pile foundation in liquefiable soil[D].Tianjin:Tianjin University,2004.(in Chi-nese)
[3]Wang Yunlong,Yuan Xiaoming,Li Yurun,et al,Frequency response characteristic of a flexible FBG sensing beam for measuring dynamic LateralDisplacement of Soil in Shaking Table Tests[J].Advanced Materials Research,2012,446-449:1551-1554.(in Chinese)
[4]李雨润,袁晓铭,梁艳.桩-液化相互作用p-y曲线修正计算方法研究[J].岩土工程学报,2009,31(4):595-599.LI Yurun,YUAN Xiaoming,LIANG Yan,Modified calculation method of p-y curves for liquefied soil-pile interaction[J].Chinese Journal ofGeotechnical Engineering,2009,31(4):595-599.(in Chinese)
[5]陈旭光,张强勇,段抗,等.基于光栅传感的模型测量系统应用研究[J].岩土力学,2012,33(5):1409-1415.CHEN Xuguang,ZHANG Qiangyong,Duan Kang,et al.Research on application of optical sensor-based measuring method to model test[J].Rock and Soil Mechanics,2009,33(5):1409-1415.(in Chinese)
[6]李雨润.液化土层中桩基横向动力响应研究[D].哈尔滨:中国地震局工程力学研究所,2006.LI Yurun.Study on lateral dynamic response of pile foundation in liquefiable soil[D].Harbin:Institute of Engineering Mechanics,China Earth-quake Administration,2006(in Chinese)
[7]李雨润,魏星,梁艳,等.液化土-桩-承台结构横向动力响应分析方法研究综述[J].地震工程与工程振动,2012,32(3),180-186.LI Yurun,WEI Xing,LIANG Yan,et al.State-of-art of study on dynamics interaction of liquefiable soil-pile-cap structure[J].Journal of Earth-quake Engineering and Engineering Vibration,2012,32(3),180-186.(in Chinese)
[8]曹振中,李雨润,徐学燕,等.德阳松柏村典型液化震害剖析[J].岩土工程学报,2012,24(3):546-551.CAO Zhenzhong,LI Yurun,XU Xueyan et al.Typical case study of liquefaction-induced damage at Songbai village following Wenchuan Earthquake[J].Chinese Journal of Geotechnical Engineering,2012,24(3):546-551.(in Chinese)
[9]李雨润,袁晓铭,李帆.基于API规范的液化土层桩基p-y曲线修正计算公式[J].地震工程与工程振动,2010.12,30(6):11-16.LI Yurun,YUAN Xiaoming,LI Fan.Modified formula for calculating the p-y curves of pile foundation in liquefied soil layer based on the API code[J].Journal of Earthquake Engineering and Engineering Vibration,2010,12,30(6):11～16.(in Chinese)
[10]LI Yurun,LIANG Yan,WEI Xing.A new method for dynamic p-y curves of pile-cap structure in layered soil,(EI).[C]//2012 International Con-ference on Vibration,Structural Engineering and Measurement,vols.Advanced Materials Research,2012,226-228:1089-1093.
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