斜坡桩-土体系动力p-y曲线影响因素分析  

Analysis of Influencing Factors on Dynamic p-y Curve of Pile-soil System on Gravelly Soil Slope

作　　者：李松波 曹利军 谢东武 曹栓栓 李宣宣 徐洪瑞 LI Song-bo;CAO Li-jun;XIE Dong-wu;CAO Shuan-shuan;LI Xuan-xuan;XU Hong-rui(The First Construction Co., Ltd., of Cecec 7th Division, Beijing 102600, China;Shuifa Planning and Design Co., Ltd., Jinan 250014, China;Department of Underground Architecture and Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]中建七局第一建筑有限公司,北京102600 [2]水发规划设计有限公司,济南250014 [3]同济大学土木工程学院,上海200092

出　　处：《科学技术与工程》2021年第34期14712-14718,共7页Science Technology and Engineering

基　　金：国家自然科学基金(41977227)。

摘　　要：以西南地区穿越典型地形地貌和地基土大类的某一线路工程为例,调研分析斜坡桩基震害特点,并采用软件FLAD^(3D)建立斜坡桩-土体系分析模型,研究斜坡桩-土体系动力p-y曲线的影响因素。获得了动力荷载作用下碎石土斜坡动力p-y曲线基本特点,归结出动力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埋深、桩径、碎石土相对密度和斜坡坡度的关系,从而引入桩侧土反力的桩径影响因子F_(D)、土性密度影响因子F_(M)、斜坡坡度影响因子F_(β),用于描述上述因素对桩侧土反力影响情况。研究结果可以更好地表述碎石土斜坡桩基在地震荷载作用下的桩-土体系间相互关系。Based on a line project in Southwest of China,in order to study the dynamic p-y curve of gravelly soil-slope-pile system,the seismic damage characteristics of slope pile foundation were investigated and analyzed,a numerical simulation analysis model was build by FLAC^(3D).The characteristics of dynamic p-y curve of gravelly soil slope under seismic load are obtained.And then the relationships between characterization parameters of dynamic p-y curve and mechanical parameters of pile-soil are further summed up.Finally,the influence factor of pile diameter(F_(D)),soil density(F_(M)),slope gradient(F_(β))are used to describe the influence of the above relationships on the pile side soil reaction.The results can better describe the pile soil interaction of gravelly soil slope pile foundation under seismic load.

关 键 词：斜坡 动力p-y曲线 影响因素 碎石土 

分 类 号：TU473.1[建筑科学—结构工程]