基于弹性支点法的双排桩支护结构计算模型及计算方法研究
发布时间：2018-07-20 18:35
【摘要】：双排桩支护结构作为基坑支护结构,其各种研究与分析并未完全成熟,且国内外计算基坑支护体系的变形与内力有许多地方没有充分考虑工程实际。本文是以双排桩支护结构为研究对象,基于弹性支点法的杆系有限元的实现,探究不同因素对双排桩支护结构位移和弯矩的影响,为将来的双排桩支护结构设计与计算提供理论依据。本文主要研究内容如下:1.建立基于弹性支点法的双排桩支护结构计算模型,并通过经验公式法计算基床系数和“m”值、按规范要求运用“m”法对土弹簧等效刚度系数进行计算,运用朗肯土压力计算公式及修正朗肯土压力计算公式对土压力进行计算;2.运用ANSYS有限元软件建立双排桩支护结构有限元模型;3.通过双排桩支护结构有限元模型分析影响双排桩支护结构内力与变形的三个因素:支护桩刚度,双排桩间距和工程地质条件;4.结合工程实例分别运用三种方法(朗肯土压力公式求解土压力,修正朗肯土压力计算公式求解土压力以及按规范要求求解)对双排桩支护结构进行水平位移分析。
[Abstract]:As the supporting structure of foundation pit, the research and analysis of double-row pile support structure is not fully mature, and there are many places where the deformation and internal force of foundation pit support system are calculated at home and abroad without fully considering the engineering practice. This paper takes the double row pile supporting structure as the research object, based on the elastic fulcrum method to realize the finite element method of the bar system, and probes into the influence of different factors on the displacement and bending moment of the double row pile supporting structure. It provides theoretical basis for the design and calculation of double row pile supporting structure in the future. The main contents of this paper are as follows: 1. The calculation model of double row pile supporting structure based on elastic fulcrum method is established, and the foundation bed coefficient and "m" value are calculated by empirical formula method, and the equivalent stiffness coefficient of soil spring is calculated by "m" method according to the specification requirements. The calculation formula of Rankine earth pressure and the modified Rankine earth pressure formula are used to calculate the earth pressure. The finite element model of double row pile supporting structure is established by ANSYS finite element software. Based on the finite element model of double row pile supporting structure, three factors influencing the internal force and deformation of double row pile supporting structure are analyzed: the stiffness of supporting pile, the spacing of double row pile and the engineering geological condition. Combined with engineering examples, three methods (Rankine earth pressure formula to solve earth pressure, modified Rankine earth pressure formula to solve earth pressure and according to specifications) are used to analyze horizontal displacement of double-row pile supporting structure.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU473.1
本文编号：2134395
[Abstract]:As the supporting structure of foundation pit, the research and analysis of double-row pile support structure is not fully mature, and there are many places where the deformation and internal force of foundation pit support system are calculated at home and abroad without fully considering the engineering practice. This paper takes the double row pile supporting structure as the research object, based on the elastic fulcrum method to realize the finite element method of the bar system, and probes into the influence of different factors on the displacement and bending moment of the double row pile supporting structure. It provides theoretical basis for the design and calculation of double row pile supporting structure in the future. The main contents of this paper are as follows: 1. The calculation model of double row pile supporting structure based on elastic fulcrum method is established, and the foundation bed coefficient and "m" value are calculated by empirical formula method, and the equivalent stiffness coefficient of soil spring is calculated by "m" method according to the specification requirements. The calculation formula of Rankine earth pressure and the modified Rankine earth pressure formula are used to calculate the earth pressure. The finite element model of double row pile supporting structure is established by ANSYS finite element software. Based on the finite element model of double row pile supporting structure, three factors influencing the internal force and deformation of double row pile supporting structure are analyzed: the stiffness of supporting pile, the spacing of double row pile and the engineering geological condition. Combined with engineering examples, three methods (Rankine earth pressure formula to solve earth pressure, modified Rankine earth pressure formula to solve earth pressure and according to specifications) are used to analyze horizontal displacement of double-row pile supporting structure.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU473.1
【参考文献】
相关期刊论文 前1条
1 钱锐,葛崇勋,姚恒,陈蕾,茅卫兵;深基坑支护中的位移土压力计算模型及计算方法[J];江苏建筑;2002年04期
，本文编号：2134395
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