软弱夹土层场地预应力管桩形状对沉桩过程的影响  

Impact of prestressed concrete pipe pile shape on the driving process in site of weak soil interlayer

作　　者：王海宁 秦永亮 王培森 WANG Haining;QIN Yongliang;WANG Peisen(China Anneng Group Second Engineering Bureau Co.,Ltd,Nanchang 330000,Jiangxi,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,Shandong,China)

机构地区：[1]中国安能集团第二工程局有限公司,江西南昌330000 [2]山东建筑大学土木工程学院,山东济南250101

出　　处：《工程建设》2025年第3期55-59,71,共6页Engineering Construction

摘　　要：预应力混凝土管桩(PC管桩)以其桩身质量可靠、适应性强、造价经济等优点,常被用于处理各种复杂地质工况。文章以河南某科技产业园实际工程为例,基于CEL法,运用有限元软件ABAQUS构建土体(欧拉体)-桩基(实体)三维数值模型,考虑实际沉桩过程中PC管桩桩长及桩径的不同及相同桩尺寸下沉桩速度不同,对比分析桩周软弱夹土层的应力及沉降量与桩基沉桩时间的响应规律。研究表明:1)相同桩尺寸下沉桩速度不同,软弱土层应力及沉降量变化所呈规律一致;2)当桩径相同时,软弱夹土层同一土体单元的应力及沉降量均随桩长的增加而增大;当桩长相同时,与桩外表面相同距离的软弱夹土层土体单元的应力及沉降量随桩径的增大而增大;3)通过综合考虑,给出符合实际工程的预应力混凝土桩的尺寸。本文研究成果可为软弱夹土层场地下预应力混凝土管桩的施工关键技术提供重要的理论依据。Prestressed concrete pipe piles(PC pipe piles)are often used to deal with various complex geological conditions due to their advantages of reliable pile quality,strong adaptability and economical cost.Taking the actual project of a science and technology industrial park in Henan Province as an example,vsing the finite element software ABAQUS and CEL method to construct a three-dimensional numerical model of soil body(Euler body)and pile foundation(solid),and considering the difference in the length and diameter of PC pipe piles and the different sinking speed of the same pile size in the actual pile sinking process,the response law of the stress and settlement of the weak soil interlayer around the pile and the pile sinking time of the pile foundation are compared and analyzed.The results show that the changes of stress and settlement in weak soil interlayer are consistent with the different sinking speeds of the same pile size.When the pile diameter is the same,the stress and settlement of the same soil body unit in the weak soil interlayer will increase with the increase of pile length.When the pile length is the same,the stress and settlement of the soil body unit of the weak soil interlayer at the same distance from the outer surface of the pile will increase with the increase of pile diameter.Through comprehensive consideration,the size of the prestressed concrete pile in line with the actual project is given.The research results can provide an important theoretical basis for the construction of key technologies of prestressed concrete pipe piles under the site of weak soil interlayer.

关 键 词：预应力管桩 软弱夹土层 沉桩过程 CEL方法 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]