桩径对碎石土斜坡桩基地震响应的影响

Influence of Pile Diameter on Seismic Response of Gravel Soil Slope Pile Foundation

碎石土斜坡桩-土体系动力相互作用及影响因素研究仍为空白。基于此,本文以某地区线路工程为研究对象,采用有限差分软件,建立其有限元模型,分析影响其地震响应的相关因素,研究桩径对其动力响应的影响。明确了动力荷载作用下,桩径与桩身位移、桩身包络弯矩、桩身峰值加速度之间的关系。并进一步结合动力p-y曲线的刚度、桩土相互作用力、桩土相对位移及曲线滞回圈面积与桩径的关系,引入桩侧土反力的桩径影响因子FD用于量化桩径对碎石土斜坡桩基地震响应的影响。

The study on dynamic interaction and influence factors of pile-soil system on gravel slope is still blank.Based on this,a regional line engineering is taken as the research object,and a finite element model is established by using finite difference software to analyze the factors that influence the seismic response and the effect of pile diameter on the dynamic response.The relationship between pile diameter and pile displacement,pile envelope moment and peak acceleration under dynamic load is clarified.Furthermore,the relationship between pile diameter and stiffness of dynamic p-y curve,pile-soil interaction force,pile-soil relative displacement and the area of hysteretic circle of the curve is discussed,the pile diameter influence factor FD is introduced to quantify the effect of pile diameter on the seismic response of pile foundation in gravel soil slope.