分离式哑铃型承台群桩锚碇内力与变形特性分析

Analysis of Internal Force and Deformation Characteristics of Pile Group Anchorage of Separated Dumbbell Shaped Bearing Platform

该文以东莞东江南支流港湾大桥"先缆后梁"施工项目为依托,利用ABAQUS建立了桩土作用的分离式哑铃型承台群桩的临时锚碇桩土有限元模型,对临时拉索张拉施工过程进行模拟,分析了锚碇内力及变形规律,并进一步分析探讨系梁桩、桩径、桩土摩擦系数、土壤变形模量对锚碇受力的影响。结果表明:在拉索荷载作用下承台有明显的弯曲变形及绕轴旋转,桩顶轴力分布受拉索荷载影响较大;系梁桩的设置能有效地控制承台变形;桩径及土壤变形模量的增大能减小桩顶顺桥向位移;桩土摩擦系数的增加使桩身下部轴力大幅度减小。

Based on the construction project of“cable before beam”of south tributary harbor bridge of Dongjiang,in Dongguan,in this paper,the temporary anchor pile-soil finite element model of separated dumbbell bearing platform group piles of the action of pile-soil is established by using ABAQUS,the construction process of temporary cable tensioning is simulated,the internal force and deformation law of anchor is analysed,and further,the influence by the tie beam pile,pile diameter,pile-soil friction coefficient and soil deformation modulus on the mechanical performance of anchorage are analyzed and discussed.The results show that the bearing platform has obvious bending deformation and rotation around the axis under the cable load,and the axial force distribution on the pile top is greatly affected by the cable load;The setting of tie beam pile can effectively control the deformation of bearing platform;The increase of pile diameter and soil deformation modulus can reduce the displacement of pile top along the bridge;The increase of pile-soil friction coefficient can greatly reduce the axial force at the lower part of the pile.