深厚软土地基中桩侧负摩阻力试验及数值分析  

EXPERIMENTAL AND FINITE ELEMENT SIMULATION STUDY ON NEGATIVE FRICTION OF PILE IN DEEP SOFT SOIL FOUNDATION

作　　者：胡雄 张凯 薛凯仁 管泽雨 陈杰 HU Xiong;ZHANG Kai;XUE Kairen;GUAN Zeyu;CHEN Jie(Power China Huadong Engineering Corporation Limited,Hangzhou 310014,China;Schol of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou310018,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,杭州310014 [2]浙江理工大学建工学院,杭州310018

出　　处：《低温建筑技术》2022年第10期85-88,共4页Low Temperature Architecture Technology

摘　　要：深厚软土地基中由于固结沉降产生的桩侧负摩阻力是桩基设计施工中需要考虑的关键问题之一。依托某工程项目,通过现场试验与ABAQUS有限元模拟试验对比研究了深厚软土地基中单桩桩侧负摩阻力的发展规律。研究结果表明,有限元模拟结果与实测结果曲线吻合较好;深厚软土地基中桩基侧摩阻力随着施工的进行而逐渐发挥,在桩身上部产生了负摩阻力且直至施工结束仍然存在。桩侧负摩阻力的发挥与施工时间、土层性质及桩顶沉降密切相关,不同土层中的桩侧负摩阻力随着施工时间先增大后减小,同时随着桩顶沉降的增加呈现出先增大后减小的变化趋势。研究结果可为桩基设计施工提供依据。The negative friction of pile caused by consolidation settlement in deep soft soil foundation has become one of the key problems in pile foundation design and construction. Based on an engineering project, the distribution law of negative friction of pile foundation in deep soft soil foundation is analyzed through field test and finite element simulation by ABAQUS. The results show that the results of finite element simulation are in good agreement with that of the field test. The friction of the pile foundation in the deep soft soil foundation developed gradually with the progress of the construction. The negative friction resistance occurred in the upper part of the pile body and still existed until the end of the construction. The negative friction resistance of pile was closely related to the construction time, the properties of soil layer, and the pile top settlement. The negative friction resistance of pile in different soil layers increased at first and then decreased with the construction time, and it firstly increased and then decreased in the later period with the increase of pile top settlement. The results may provide the reference for the pile foundation design and construction.

关 键 词：深厚软土 现场试验 有限元模拟 桩侧负摩阻力 

分 类 号：TU447[建筑科学—岩土工程]