基坑扩底承载式斜撑支护变形数值模拟研究OA北大核心
Numerical study on deformation of pit tilted strut of concrete-filled steel tube with belled bearing base
扩底承载式钢管混凝土斜支撑技术是一种新型基坑开挖支护技术,许多工程案例已经证实了其良好的支护性能,但目前还缺乏对该倾斜支撑功能机理的深入研究.通过有限元数值模拟建立应用扩底承载式斜撑基坑开挖的数值模型,利用监测数据验证模型的合理性.基于此模型探究扩底承载式斜撑在基坑开挖过程中的变形特性,通过分析不同工况时的挡墙变形、基底隆起量和地表沉降量得到土体刚度、土体强度、斜支撑的倾斜角度对扩底承载式斜撑支护性能的影响.结果表明:扩底斜撑对基坑开挖的土体与支护变形具有明显控制效果,能有效减小基坑的基底隆起、挡墙侧移和坑外地表沉降,且在软土地区的适用性更高;扩底斜撑倾斜角度的增加使支撑趋于横向受力,具有更高的承载力,有利于控制基坑开挖过程中土体和挡墙的变形,但会提高工程造价,需要根据具体工程情况以及对土体控制要求选择合适的倾斜角度.
Bottom-bearing steel pipe concrete inclined support technique is a promising method for foundation pit excavation.While its effectiveness is evident in various engineering cases,its underlying mechanism requires further investigation.This study establishes a numerical model using finite element simulation,validated against monitoring data from specific projects.It explores the deformation of the inclined support during excavation,revealing insights into its performance under different soil conditions and tilt angles.Findings indicate significant control over soil and support deformation,especially in soft soil areas.Increasing the tilt angle enhances lateral force resistance but raises project costs.Thus,selecting the appropriate angle is crucial based on specific project needs and soil conditions.
仉文岗;严玉苗;袁运涛;陈春霞;牟云贞;黎泳钦
重庆大学 土木工程学院,重庆 400045重庆大学 土木工程学院,重庆 400045江苏华岩建设有限公司,江苏 苏州 215101中国建筑西南勘察设计研究院有限公司,成都 610093长江重庆航道工程局,重庆 400010重庆大学 土木工程学院,重庆 400045
建筑与水利
基坑工程有限元扩底斜撑地表沉降基底隆起
excavationfinite elementbelled bearing baseground settlement,basal heave
《土木与环境工程学报（中英文）》 2025 (4)
19-27,9
中国建筑西南勘察设计研究院科研项目(H20220430)长江重庆航道工程局科技项目(H20230330)国家自然科学基金(52078086) Southwest Survey and Design Institute of China Construction Cooperative Research Project(No.H20220430)Science and Technology Program of Yangtze River Chongqing Navigation Engineering Bureau(H20230330)National Natural Science Foundation of China(No.52078086)
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