【摘要】 根式锚碇是由刚性承台将集群根式基础连结成整体而形成的一种新型锚碇基础形式，通过相互作用的承台、集群根式基础和土体共同承担荷载，承载力较普通基础得以大幅提高，为在软弱覆盖层地区修建的悬索桥提供了一种高效、经济的主缆锚固方案。依托秋浦河大桥根式锚碇基础工程，借助于有限元软件FLAC3D建立了数值仿真模型。分析了根式锚碇在两种工程实际工况(锚碇整体施工结束(工况1)和悬索桥运营阶段(工况2))的整体变位情况，研究了承台与根式基础集群的变位特征及受力特性，结合现场监测数据进行了部分验证。结果表明：锚碇在主缆力作用下的水平、竖向变位满足相关规范规定，规律与类似工程一致；在工况1中锚碇在锚体偏载作用下，整体呈现后仰姿态，竖向荷载主要由承台和集群根式基础承担；在工况2中锚碇在主缆力作用下，整体呈前倾姿态，此时主缆力的水平分力使得锚碇整体水平变位增大，竖向荷载主要由承台(占比33.37%)和集群根式基础(占比66.63%)共同承担，水平荷载主要由集群根式基础(占比91.92%)承担，整个锚固体系处于受力合理状态。研究成果可以为今后根式锚碇基础工程提供理论和参数支撑。更多还原

【Abstract】 Root anchorage, formed by the rigid cap connecting the cluster root foundation, is a new type of anchorage foundation, which bears the load together with the interaction of cap, cluster root foundation and soil. Compared with ordinary foundations, its bearing capacity is greatly improved, providing an efficient and economical cable anchoring solution for suspension bridges built in areas with weak covering layers. However, the related research on its bearing characteristics and mechanism is not perfect, and there is a lack of engineering application verification. On the background of the project of root anchorage foundation of Qiupu River bridge, the numerical simulation model is established by using finite element software FLAC3 D. The overall displacements of the root anchorage under the conditions at the completion of the anchorage construction(condition 1) and the operation stage of the suspension bridge(condition 2) are analyzed. The displacement and force characteristics of the bearing platform and the root foundation cluster are studied, and partial verification is carried out combining with on-site monitoring data. The result shows that(1) the horizontal and vertical displacements of anchorage under the load of main cable meet the requirements of relevant regulations, and the rules are consistent with those of similar projects;(2) in case 1,under the partial load, the anchorage presents an overall backward state, and the vertical load is mainly borne by the caps and the cluster root foundation;(3) in case 2,under the action of the main cable force, the anchorage presents an overall forward state, at that time, the overall horizontal displacement of the anchorage increased due to the horizontal component of the main cable force, the vertical load is mainly borne by the caps(33.37%) and the cluster root foundation(66.63%),and the horizontal load is mainly borne by the cluster root foundation(91.92%),the entire anchorage system is in a reasonable state of stress. The research result can provide theoretical and parameter support for the future root anchorage foundation projects.更多还原