Abstract: In the construction of urban viaducts, in order to reduce the impact of bridge piers and foundation construction on road traffic, the quick-installed bridge piers and anchor static pressure pile construction technology can be used. Taking the anchor static pressure pile foundation of a quick-installed bridge pier as the background, the settlement characteristics of the static pressure pile of the anchor rod were studied according to the characteristics of post-pressing piles. The finite element models of pile-free pile cap and pile-group foundation after pile-pressing were established respectively. The influence of the elastic modulus of the upper soil layer (E1), the elastic modulus of the lower soil layer (E2) and the friction coefficient of the pile side (f) on the maximum settlement of the foundation (smax) and the load sharing ratio (η) were compared and analyzed. The results show that: under the two working conditions with pile-free pile cap and pile-group foundation after pile pressing, with the increase of E1 and E2, the maximum settlement of the foundation smax continues to decrease; E1 has a greater influence on the smax of the pile-free foundation, and E2 has a greater influence on the smax of the pile-group foundation; as f increases, the smax of the pile group foundation and the soil load sharing ratio ηsoil gradually decrease, but the influence of f is limited.

Key words: bridge engineering, foundation engineering, anchor static pressure pile, settlement analysis, load sharing ratio

摘要： 在城市高架桥施工时，为减小桥墩及基础施工对道路交通的影响，可采用快装桥墩及锚杆静压桩施工工艺。以某快装桥墩锚杆静压桩基础为背景，针对桩基后压成桩的特点，研究了锚杆静压桩的沉降特性；分别建立了无桩承台和压桩后群桩基础2种工况的有限元模型，对比分析了上土层弹性模量E1、下土层弹性模量E2和桩侧摩阻系数 f对基础最大沉降量smax及桩土荷载分担比 η的影响。结果表明：在无桩承台和压桩后群桩基础2种工况下，随着E1及E2的增大，基础最大沉降量smax不断减小；E1对无桩承台基础smax的影响较大，E2对群桩基础smax的影响较大；随着f的增大，群桩基础的smax及土体荷载分担比ηsoil逐渐减小，但影响有限。

关键词: 桥梁工程, 地基基础工程, 锚杆静压桩, 沉降分析, 荷载分担比