水平荷载下挤扩支盘桩群桩受力特性分析

利用三维弹塑性有限元模型,对水平荷载作用下挤扩支盘桩群桩受力特性进行分析,得出各桩弯矩以及桩土相对位移的变化规律及不同位置、不同荷载作用、不同土体深度时桩周土反力的变化曲线。分析表明:桩弯矩在支盘处因支盘的影响而发生突变,支盘下桩体的弯矩大大减小;后排桩后土体相对位移大于前排桩后土体相对位移;桩基主要通过其桩前土体的作用来抵抗水平荷载,桩前土体最大反力值出现在第一个支盘的端部,支盘对其下一段范围内土体起到"减载"作用。

ANALYSIS OF BEARING LOAD CHARACTERISTIC OF SQUEEZED BRANCH AND PLATE PILE GROUP FOUNDATION UNDER LATERAL LOAD

It is analyzed the bearing load characteristic of squeezed branch and plate pile group foundation under lateral load by 3D elastic-plasticity finite element model.It is obtained the bending moment of piles,relative displacement between pile and soil,and the change curve of reaction of soil in different position,different load and different depth.The results show that the plate affects the bending moment of pile,which generates saltation in the position of plate,and is reduced greatly under the branch and plate;relative displacement of back pile is bigger than the front pile;pile foundation bears the lateral load by the working of the front soil.The great reaction of soil takes place in the head of the first plate,and which affects the soil under the place by off-loading.