PHC管桩在深厚软土地区驳岸挡墙中的应用研究——以福州青口某工程为例  

Applied research of PHC pipe pile in revetment retaining wall in deep soft soil area——Take a project in qingkou,fuzhou as an example

作　　者：石金华 SHI Jinhua(Fuzhou Design Institute of Architectural, Fuzhou 350001)

机构地区：[1]福州市建筑设计院,福建福州350001

出　　处：《福建建筑》2018年第12期53-56,76,共5页Fujian Architecture & Construction

摘　　要：福州地处东南沿海,淤泥分布范围广且力学性能较差,在深厚的淤泥地层上修建驳岸挡墙,常常会出现驳岸挡墙造价高、工期长或者工后沉降大等各类问题。文章以福州青口某工程为例,依据项目特点和场地条件,将先张法预应力高强混凝土管桩和扶壁式挡土墙应用到驳岸挡墙设计中,同时,利用生态板桩作为施工围堰。为了对支护结构进行合理分析,采用非线性有限元分析软件ABAQUS建立支护体系的有限元模型,对管桩的内力、变形及支护体系的整体稳定性进行分析,提出以特征点的水平位移和折减系数关系曲线上曲率最大拐点结合桩顶位移10mm对应的折减系数作为整体稳定安全系数判据,深入探讨了管桩在深厚软土挡墙中的设计应用要点。Fuzhou is located in the southeast coastal,silt is widespread and the mechanical property of silt is poor,there are many problems in the construction of the revetment wall in the deep silt stratum such as high cost,long construction period,large post-construction settlement. Considering the features and site conditions of the project,pretensioned spun concrete piles and counterfort retaining wall are applied to the design of revetment retaining wall in the engineering,meanwhile,ecological sheet pile is used as cofferdam. For rational analysis of the supporting structure,the finite element model of the supporting system is established by the nonlinear finite element software ABAQUS to analyze the internal force,deformation of the pipe pile and the overall stability of the supporting system,the safety factor of stability can be determined by the curve of horizontal displacement-reduction factor at the characteristic point,meanwhile,through the reduction coefficient corresponding to the displacement of pile top 10 mm,the critical state of stability can be judged,the key points of design and application of pipe pile in deep soft soil retaining wall are discussed in depth.

关 键 词：先张法预应力高强混凝土管桩 扶壁式挡土墙 生态板桩 非线性有限元法 稳定性分析 

分 类 号：TU47[建筑科学—结构工程]