基于单桩荷载试验的群桩荷载与位移关系模拟  

Simulation of Relationship between Load and Displacement of Group Pile Based on Single Pile Loading Test

作　　者：戴国亮[1,2] 龚维明[1,2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]东南大学土木工程学院,江苏南京210096

出　　处：《公路交通科技》2011年第5期1-5,140,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50908048);江苏省自然科学基金项目(BK2008315)

摘　　要：为了建立单桩荷载与位移的统一计算方法,基于荷载传递理论和现场模型试验结果,采用双曲线的模型来模拟实测的τ-s以及σ-sb曲线,回归相关参数,通过迭代计算得到单桩的Q-s曲线,与实测的Q-s曲线比较吻合。基于等效墩模型,应用单桩双曲线模型参数,对群桩荷载与位移进行了模拟,并与实测结果进行了对比,还对参数β和g的取值进行了分析。结果表明对于6组试验群桩,当β=0.3时,模拟曲线的初始刚度与实测结果基本吻合,而参数g则在区间0.15~0.4之间变化,只要参数选取合理,采用等效墩模型计算群桩基础是合适的。In order to establish a unified calculating method of the load and displacement of single pile,based on the load transfer theory and the field model test results,the measured τ-s curve and σ-sb curve were simulated by using hyperbolic model to regress the relative parameters.Then the Q-s curves of single pile were obtained by the iterative calculation,and they coincide with the measured Q-s curves.Based on the equivalent pier model,by applying the single pile hyperbolic model parameters,the load and displacement of the group piles were simulated,the measured results were compared with the simulation results,and the values of β and g were analyzed.The results show that for six pile groups,when β is equal to 0.3,the initial stiffness of simulated curves are basically consistent with the experimental results,while the parameter gis in the range between 0.15 and 0.4.As long as selecting the right parameters,it is appropriate for calculating the foundation of the group pile by using the equivalent pier model.

关 键 词：道路工程 单桩 荷载传递法 双曲线模型 Q-S曲线 群桩 等效墩模型 

分 类 号：TU473.1[建筑科学—结构工程]