循环荷载下饱和粉土地基单桩水平承载特性试验研究  

Model Tests on Lateral Bearing Capacity of Single Piles Under Cyclic Loads in Saturated Silt

作　　者：刘红军[1,2] 张冬冬[2] 吕小辉[2] 王虎[2] 

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学环境科学与工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2015年第1期76-82,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41072216);山东省科技发展计划项目(2014GGX104007)资助

摘　　要：在饱和粉土地基中进行了单桩水平静力和循环加载室内模型试验,实测得到静载和循环荷载下桩身弯矩与深度的关系、桩身最大弯矩与循环次数之间的关系等,推导出静载和循环荷载下粉土的p-y曲线,并结合API规范给出了针对粉土地基的相关参数。单桩循环加载试验结果表明,在一定深度内随着循环次数增大,粉土极限抗力显著减小,文中给出了不同循环次数和深度下粉土地基极限抗力的折减系数建议值。Model tests on single pile under static and cyclic loads in saturated silt were carried out.Relationship between pile bending moment and depth,as well as the relationship between pile maximum bending moment and cycle times were obtained by measuring the strain.P-y curves of silty soil under static and cyclic loads were deduced,the API specification related parameters in the silt foundation was given accordingly.Results of single pile tests under cyclic loads showed that in a certain depth range,the ultimate resistance of silt significantly decreased as the cycles of loading increased.Moreover,recommended values of ultimate resistance reduction factor were proposed for silt foundation under different cycles and depth.

关 键 词：循环荷载 单桩基础 P-Y曲线 饱和粉土地基 

分 类 号：TU473[建筑科学—结构工程]