大面积回填土及深厚软土桩基负摩阻力试验研究  

Field test research on negative friction of pile in large area backfill soil and deep soft soil foundation

作　　者：张凯 武金鹏 薛凯仁 史义文 李翔 Zhang Kai;Wu Jinpeng;Xue Kairen;Shi Yiwen;Li Xiang(Power China Huadong Engineering Corporation Limited,Hangzhou 310014,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,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,浙江杭州310014 [2]浙江理工大学建工学院,浙江杭州310018

出　　处：《山西建筑》2023年第6期95-97,129,共4页Shanxi Architecture

基　　金：浙江省自然科学基金(LY13E090010)。

摘　　要：在大面积填土及自身固结沉降作用下深厚软土地基中的桩基易产生较大的负摩阻力,引起桩身沉降并降低其承载能力。依托某工程建设项目,通过现场试验对大面积回填土及深厚软土地基中桩基的负摩阻力分布规律进行了分析。试验结果表明,大面积回填土及深厚软土地基中的桩基在施工过程中的桩身轴力沿桩深先增大后减小,且在桩身上部产生了桩侧负摩阻力。桩侧负摩阻力的发挥与土层、施工时间等密切相关,不同土层中的桩侧负摩阻力随着施工时间先增加后减小,施工结束时,桩身上部的桩侧摩阻力仍然存在。桩基设计施工时应充分考虑桩侧负摩阻力的影响。The negative friction of pile foundation in deep soft soil foundation is easy to produce large negative friction,which causes pile settlement and reduces its bearing capacity.Based on an engineering project,the distribution law of negative friction of pile foundation in large area backfill and deep soft soil foundation is analyzed through the field test in this paper.The test results show that the axial force of pile foundation in large area backfill and deep soft soil foundation first increases and then decreases along the pile depth during construction.The negative friction of pile side is generated in the upper part of pile.The exertion of pile negative friction is closely related to soil layer and construction time,etc..The pile side negative friction in different soil layers first increases and then decreases with construction time,and varies with different soil layers.At the end of construction,the pile side friction still exists in the upper part of the pile.The influence of negative frictional resistance on pile should be fully considered in the pile design and construction.

关 键 词：大面积回填土 深厚软土 现场试验 桩侧负摩阻力 

分 类 号：TU473.14[建筑科学—结构工程]