深基坑桩锚支护结构变形分析和数值模拟

Taking the deep foundation pit reconstruction project in Hongqi village of Ganzhou as the research object, the numerical simulation analysis of pile-anchor retaining structure in deep foundation pit was carried out by using the large finite element software of Midas. The accuracy and feasibility of the model were verified by comparing the deformation value of soil in deep foundation pit and the actual monitoring deformation value. It is found that the stress of bolt is distributed evenly in the free section and decreased gradually in the anchorage section. In addition, the influencing factors of deformation of pile-anchor retaining structure in deep foundation pit were deeply analyzed. The results show that the displacement of soil in deep foundation pit can be greatly restrained by increasing the length of pile and reducing pile spacing, however, the effect of this inhibition on pit deformation is limited. By optimizing anchorage position of the bolt, the utilization ratio of anchor can be improved effectively. when the anchoring depth of the third anchor is 6.5~7 m, the axial stress of the two bolts is similar, which is the best anchorage position