循环荷载作用下粉土地基中刚性桩桩土相互作用研究  

RESEARCH ON PILE-SOIL INTERACTION OF A RIGID PILE SUBJECTED TO CYCLIC LOADING IN SILT FOUNDATION

作　　者：孙永鑫 刘海涛[1] 何春晖 朱毅 朱斌 SUN Yongxin;LIU Haitao;HE Chunhui;ZHU Yi;ZHU Bin(Economic and Technology Research Institute,State Grid Shandong Electric Power Company,Jinan 250021,China;Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]国网山东省电力公司经济技术研究院,济南250021 [2]浙江大学岩土工程研究所,杭州310058

出　　处：《工业建筑》2018年第11期111-115,181,共6页Industrial Construction

基　　金：国家电网公司科技项目(B3440917K001)

摘　　要：针对近海风机单桩基础,采用室内模型试验,对粉土地基中刚性桩循环加载条件下的桩土相互作用规律进行研究,实时监测了加载过程中荷载、位移和土压力的变化。研究发现循环荷载作用下桩周土压力最大值和最小值没有明显的弱化;循环加载模式下,刚性桩变形转动中心在0.85埋深以下;基于静力加载条件下的水平非线性地基反力系数,提出了粉土地基中刚性桩循环荷载作用下土的水平抗力-位移曲线。在此基础上,提出循环荷载作用下预测超大直径单桩基础变形的简化计算方法。Aiming at the monopile foundation of offshore wind turbine,a series of large scale model tests were conducted on a rigid pile of silt foundation to investigate the pile-soil interaction under horizontal cyclic loading.In the model tests,the load,displacement and earth pressure were obtained.The test results showed that the rotational center of the pile subjected to cyclic loading was below the depth of about 0.85 times of the pile embedded length. Based on the subgrade reaction coefficients of the pile under static loading,the cyclic loading-displacemet curve for rigid pile in silt foundation was derived.Then,a simplified calculating method was proposed,it could be used for predicting the deformation of rigid pile with super-large diameter subjected to cyclic loading.

关 键 词：近海风机 刚性桩 循环荷载 桩土相互作用 累积变形 

分 类 号：TU473.1[建筑科学—结构工程]