水平循环荷载下桩土动力p-y骨干曲线模型试验  

Model test for dynamic p-y backbone curves of soil-pile interaction under cyclic lateral loading

作　　者：梁发云[1,2] 秦承瑞 陈思奇[1,2] 张浩[1,2] LIANG Fa-yun;QIN Cheng-rui;CHEN Si-qi;ZHANG Hao(Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University,Shanghai 200092, China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《中国港湾建设》2017年第9期21-26,共6页China Harbour Engineering

基　　金：国家自然科学基金资助项目(41672266);上海市人才发展资金资助项目(201548)

摘　　要：针对遭受波浪或台风等水平循环荷载作用的桩基础问题,开展了水平循环荷载下砂土中的单桩和群桩承载特性的模型试验。试验结果表明,桩身承受的弯矩随着循环加载频率的增加而增大,其峰值点出现在距离地基表面6~8倍桩径的深度范围;桩-土非线性特性随着水平荷载振动幅值的增大而增强,单桩割线刚度逐渐降低;群桩与单桩的变化规律类似,但前排桩与后排桩有着明显差异;并将p-y曲线法与拟静力法相结合建立动力p-y骨干曲线进行分析,有助于在实际工程中考虑桩-土相互作用的影响。To analyze pile foundation subjected to cyclic lateral loads of waves and wind,we carried out model tests on bearingcapacity of single pile and pile groups in the dry sand under cyclic lateral loading.The results indicate that the pile bendingmoment increases with the increase of cyclic frequency,and its peaks are appeared within6to8times the diameter from theground surface.Pile-soil nonlinear becomes more and more apparent with the increase of vibration amplitude.Secant stiffnessof single pile decreases with the increase of amplitude.The change law of group pile is similar to single pile,but the front pileand the rear pile show the difference.Dynamic p-y backbone curves are proposed on the basis of pseudo-static method and p-ycurve method.It is helpful to consider the influence of pile-soil interaction in practical engineering.

关 键 词：水平循环荷载 桩基础 砂土 动力p-y骨干曲线 模型试验 

分 类 号：U652.74[交通运输工程—港口、海岸及近海工程]