大角度斜拉桩结构特性研究  

Structural Characteristics of Large-angle Cable-stayed Pile

作　　者：王振 苟家满 张祥恒 张浩 何建勇 Wang Zhen;Gou Jiaman;Zhang Xiangheng;Zhang Hao;He Jianyong(China Ordnance Industry Survey and Geotechnical Institute Co.,Ltd.,Beijing 100053,China;No.3 Exploration Institute of Geo-logy and Mineral Resources,Yantai 264000,Shangdong,China)

机构地区：[1]中兵勘察设计研究院有限公司,北京100053 [2]山东省第三地质矿产勘查院,山东烟台264000

出　　处：《岩土工程技术》2024年第4期408-414,共7页Geotechnical Engineering Technique

摘　　要：大角度斜拉桩支护结构可节约坑外占用空间,具有施工便捷、造价较低等优点,适用于坑外锚拉空间受限的场景。为了进一步分析其变形和受力机制,选取典型中密砂土进行单一土层数值建模,通过改变锚索角度以及开挖深度对结构受力及变形特征进行分析,结果表明:锚索角度变化对结构受力及变形影响较大,将锚索简化为水平弹性支座将产生较大的计算偏差;需要考虑轴力对桩身抗弯、抗剪承载力的提高作用以及单桩竖向承载力问题。将锚索对支护桩的约束作用考虑为斜向弹性支座,建立了更加符合实际受力状态的力学计算模型及平面杆系有限单元法实现途径,将其应用于实际工程,通过与监测数据对比,结果表明大角度斜拉桩具有良好的支护性能,提出的力学计算模型能够准确地反映该种新型结构的受力、变形特点。The large-angle cable-stayed pile support structure can save space outside the pit,has advantages such as convenient construction and low cost,and is suitable for scenarios where the anchoring space outside the pit is limited.To further study its deformation and stress mechanism,typical medium-dense sandy soil was selected for numerical modeling of a single soil layer,and the stress and deformation characteristics of the structure were analyzed by changing the angle of the anchor cable and the excavation depth.The results show that the change of the angle of the anchor cable has a great impact on the stress and deformation of the structure,and simplifying the anchor cable into a horizontal elastic support will produce a large calculation deviation.It is necessary to consider the effect of axial force on the flexural and shear bearing capacity of pile and the vertical bearing capacity of single pile.On this basis,the constraint effect of anchor cable on soil retaining pile is considered as inclined elastic support,and a mechanical calculation model which is more in line with the actual stress state and the plane rod system finite element method were established.It is applied to a practical project and compared with the monitoring data.The results show that:large angle cable-stayed pile has good supporting performance,and the mechanical calculation model proposed can reflect the stress and deformation characteristics of this new structure.

关 键 词：大角度 斜拉桩 支护结构 锚索 弹性支座 

分 类 号：TU470[建筑科学—结构工程]