【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。更多还原

【Abstract】 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.更多还原