圆形地连墙设计关键问题及轴对称有限元法
发布时间：2018-08-05 13:55
【摘要】：为完善圆形地连墙设计理论,探讨了现行规范方法的力学概念、环向应力计算方法、土-结构相互作用及环向刚度折减系数等关键问题,基于薄壳理论推导了地基双向弹簧条件下圆形地连墙的基本微分方程,改进非线性土体弹簧模型以考虑土压力发挥极限值所需的位移,引入连续弹簧模拟环形内衬,采用增量法计入施工过程影响,并编制了有限元程序;同时,提出采用单元体试验研究圆形地连墙环向刚度折减系数取值方法,考虑接缝刚度与宽度、地连墙半径、槽段平均长度等因素建立了折减系数计算公式,最后,以阳逻大桥圆形锚碇基坑工程为例进行了计算与对比分析。结果表明:典型条件下折减系数为0.467~0.679;该方法位移计算值与实测值基本吻合,克服了现行方法无法分析支护结构环向应力及地连墙两侧土压力发展过程的缺陷;计算参数物理意义明确、易于获取,可为工程设计提供较为全面的参考依据。
[Abstract]:In order to perfect the design theory of circular earth connecting wall, the key problems such as mechanical concept of current code method, calculation method of circumferential stress, soil-structure interaction and coefficient of toroidal stiffness reduction are discussed. Based on the thin shell theory, the basic differential equation of circular earth wall under the condition of bidirectional spring is derived. The nonlinear soil spring model is improved to take into account the displacement required for the earth pressure to exert its limit value, and the continuous spring is introduced to simulate the ring lining. The incremental method is used to take into account the influence of the construction process, and the finite element program is compiled. At the same time, a method for calculating the circumferential stiffness reduction coefficient of circular earth connecting wall is put forward by using the element body test, considering the joint stiffness and width, the radius of the ground connecting wall. The calculation formula of the reduction coefficient is established by the factors such as the average length of the slot section. Finally, the calculation and comparative analysis of the circular Anchorage foundation pit of Yangluo Bridge are carried out. The results show that the reduction coefficient is 0. 467 ~ 0. 679 under typical conditions, the calculated displacement value of this method is in good agreement with the measured value, which overcomes the defects of the current method which can not analyze the circumferential stress of the supporting structure and the development process of the earth pressure on both sides of the retaining wall. The physical meaning of the calculation parameters is clear and easy to obtain, which can provide a more comprehensive reference for engineering design.
【作者单位】： 长沙理工大学土木与建筑学院;广东长大公路工程有限公司;湖南省交通规划勘察设计院;
【基金】：国家自然科学基金项目(51478051) 交通运输部建设科技项目(2013 318 798 320)
【分类号】：U443.1
本文编号：2165999
[Abstract]:In order to perfect the design theory of circular earth connecting wall, the key problems such as mechanical concept of current code method, calculation method of circumferential stress, soil-structure interaction and coefficient of toroidal stiffness reduction are discussed. Based on the thin shell theory, the basic differential equation of circular earth wall under the condition of bidirectional spring is derived. The nonlinear soil spring model is improved to take into account the displacement required for the earth pressure to exert its limit value, and the continuous spring is introduced to simulate the ring lining. The incremental method is used to take into account the influence of the construction process, and the finite element program is compiled. At the same time, a method for calculating the circumferential stiffness reduction coefficient of circular earth connecting wall is put forward by using the element body test, considering the joint stiffness and width, the radius of the ground connecting wall. The calculation formula of the reduction coefficient is established by the factors such as the average length of the slot section. Finally, the calculation and comparative analysis of the circular Anchorage foundation pit of Yangluo Bridge are carried out. The results show that the reduction coefficient is 0. 467 ~ 0. 679 under typical conditions, the calculated displacement value of this method is in good agreement with the measured value, which overcomes the defects of the current method which can not analyze the circumferential stress of the supporting structure and the development process of the earth pressure on both sides of the retaining wall. The physical meaning of the calculation parameters is clear and easy to obtain, which can provide a more comprehensive reference for engineering design.
【作者单位】： 长沙理工大学土木与建筑学院;广东长大公路工程有限公司;湖南省交通规划勘察设计院;
【基金】：国家自然科学基金项目(51478051) 交通运输部建设科技项目(2013 318 798 320)
【分类号】：U443.1
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