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.