【作者】 王保建；

【导师】 熊巨华； 朱碧堂；

【作者基本信息】 同济大学 ， 岩土工程， 2007， 硕士

【摘要】 本文通过对已有模型试验、数值分析试验以及土压力理论进行分析、总结和归纳，得出影响土压力大小和分布的主要因素。进而根据大量的围护结构变形实测数据，总结出围护结构变形模式主要有以下几种：绕墙趾向坑内转动、绕墙顶向坑内转动、平移和鼓胀四种基本变形模式及其组合模式。在此基础上，利用数值分析方法对土压力的各种主要影响因素进行了较为详细的分析，同时探讨了墙后土体渐进破坏的过程、土体破裂面形状与土体参数和围护结构与土体之间的摩擦特性之间的关系，之后对围护结构不同变形模式下土拱效应产生的机理进行了分析。当围护结构绕墙趾向坑内转动时，根据围护结构最大位移与墙后土体塑性区之间的关系和该变形模式下土拱效应产生的机理，推导出了同时考虑围护结构位移和土拱效应的土压力公式，利用该公式所计算土压力与实测结果较吻合。当围护结构绕墙顶向坑内转动时，根据前文所得破裂面形状和土拱效应机理，推导了同时考虑这两种影响因素的土压力公式，利用该公式所计算土压力与实测土压力较相符。 本文还探讨了围护结构不同变形模式与基坑四周土体沉降影响范围、沉降分布形式以及沉降最大值和所处位置之间的关系。经分析发现，围护结构变形越向下发展，引起的强后土体沉降范围越大，沉降最大值的位置也越向远离墙体的方向移动，而沉降曲线却有越来越平缓的趋势。同时，围护结构变形扫掠过的体积与墙后土体下沉量有某种相关性，扫掠过的体积越大，墙后土体下沉的体积越大。更多还原

【Abstract】 Based on the analysis of the model tests and numerical analysis and the theories of earth pressure that researchers ever did, the factors that mainly affect the magnitude and distribution of earth pressure are summarized. Then, on the basis of a lot of measured deformation of retaining structures, the paper assumes that the deformation modes of retaining structures only has four kinds of basic deformation modes, that is, Rotation about base, Rotation about top, Translation and Flexure, and other deformation modes can be combined with the four kinds of basic deformation modes. Then, mainly factors that influence the magnitude and distribution of earth pressure are analyzed in detail. At the same time, the paper discusses the course of the progressive failure of soil and the relationship between the shape of failure surface and soil parameters. Then, soil arching effect mechanisms of different deformation modes of retaining structures are analyzed. For rotation about base, based on the relationship between biggest displacement of retaining structures and plastic zone of soil and soil arching effect mechanism, the formula of earth pressure considering displacement of retaining structures and soil arching effect is gained, and comparisons of the calculated results with the results from numerical analysis show that the formula can provide good predictions of earth pressure. For rotation about top, on the basis of shape of failure surface and soil arching effect, the formula of earth pressure which considers the two factors simultaneously is gotten, and the calculated results can provide good prediction of earth pressure.At last, the paper studies the relationships between different deformation modes and surface settlement extents of soil, modes of settlement, maximum settlement and the location of maximum settlement. The results indicate that the lower the deformations of retaining structures develop, the larger the surface settlement extents of soil caused by it, and the farther the locations of maximum settlements are away from retaining structures. Besides them, the results also indicate that the surface settlements of soil behind retaining structures are related to the deformations of更多还原