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加筋挡土墙关键技术研究 【作者】贺会团 【导师】赵维炳

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*P#ZVB&}"kpcz {"?0【作者】贺会团导师赵维炳水利论文y)k0V$EpP\$D[^!t
【作者基本信息】南京水利科学研究院,岩土工程,2007年,博士水利论文0NgHK|

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&?3l4X1eu5S AYsj0【中文摘要】 加筋挡土墙作为一种新型柔性结构,在各个工程领域已得到了广泛的应用,然而目前关于加筋土工作机理的认识还很不成熟,其设计和计算理论还相对落后于工程实践。现行加筋挡土墙设计方法多为基于极限平衡状态下的强度计算和稳定验算,没有考虑地基加筋挡土墙变形以及地基土参数的作用,这些都影响着加筋挡土墙的推广和应用。本文首先对加筋挡土墙结构的研究现状做了总结和回顾,然后针对加筋挡土墙的加筋机理、设计方法和计算理论进行了研究,主要内容有:(1)利用直剪试验、拉拔试验和三轴试验深入研究加筋土的加筋机理和筋土界面摩擦特性。通过交叉分析不同加筋材料与不同填料共同作用下的应力变形特征,分析筛选具有良好适配性的加筋、填料组合,为加筋挡土墙的设计服务。(2)通过离心模型试验模拟加筋挡土墙实际工作性状,研究加筋挡土墙的变形以及加筋长度、间距、刚度等各种因素变化对加筋挡土墙工作性状的影响。(3)通过有限元程序分析加筋挡土墙变形影响因素,并给出这些影响因素取值的合理范围推荐值。同时研究发现地基土参数对加筋挡土墙性状有着不可忽视的影响。结合前述章节研究内容,提出了基于变形并考虑地基影响的加筋挡土墙设计方法。并提出了一些控制变形...更多的方法。(4)在等效附加应力的基础上,提出了土体内插加筋单元的计算方法。这种方法的基本原理是将土体与筋带独立划分单元,不考虑筋带单元的节点重叠,这些节点的位移变量为基本变量。在筋带节点位移的土体单元内部设置与筋带节点数目相同的土体附加节点,这些节点的位移由包含相应节点的土体单元的位移插值得到。在土体附加节点与筋带之间建立接触面的单元将力传到筋带,而筋带的一端是连接在混凝土面板挡墙上的,从而建立了土—筋带—面板挡墙联合作用的有限元模型。并结合有限元模型分析,对加筋挡土墙设计参数进行研究。(5)最后对全文所作工作进行总结,并指出本文工作的一些不足之处,以及今后需要进一步研究的方向。  还原水利论文8k/V1C\-V } Wnt/i

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【英文摘要】 As a new kind of flexible retaining structure, geosynthetic reinforced retaining wall has been widely used in practice. However, the reinforcement mechanism has not been well understood. The current corresponding design methods and analysis theories are far inadequate for practical applications. The existing design methods are generally developed on base of the limit equilibrium state theory to perform the analyses of stabilization. The influence of deformation on reinforced retaining structure has not been well considered. This will absolutely draw back advanced development and application of the reinforced retaining structures.In this thesis, literature review on the existing research of reinforced retaining structure is performed. Then, further study is conducted on the reinforcement mechanism, design method and analysis theory. This thesis includes the following parts:(1) Direct shear test, tensile test and triaxial test are performed to study the reinforcement mechanism and soil-g...更多eosynthetic interface behavior. Different fills and reinforced materials are used in the tests. The characteristics of the stress-strain curves are analyzed. Good combination of fills and reinforce materials is suggested for applications.(2) Centrifuge model test is performed as well. The influence of length and spacing of geosynthetics, and the rigidity of the reinforced materials are studied by comparing the deformation behavior of the reinforced retaining structures.(3) Finite element analysis is conducted to assess the influencing factors for the reinforced retaining structure. Good design parameters are suggested. It is also suggested that the soil parameters have an important influence on the behavior of the structures. A deformation controlled design method is suggested.(4) Base on the concept of "equivalent additional stress method", a new finite element is suggested. Geosynthetie material and soils are jointly incorporated in mesh formation. The geosynthetic element has free deformation on each node, which is formulated by means of the deformation of surrounding soil elements so that compatibility of deformation is assured and force is transferred through soils to geosynthetics. The end of the geosynthetics is attached on the retaining structure, thus a composite reinforced retaining structure can be analyzed by finite element.(5) Finally, summary and conclusions are drawn. Further research and some drawbacks are assessed.  还原水利论文,FL |wg

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【中文关键词】 加筋挡土墙; 加筋机理; 摩擦特性; 离心模型试验; 变形; 设计方法; 有限元方法
3xD1\V c+\&y0【英文关键词】 reinforced retaining wall; reinforcement mechanism; friction characteristics; centrifuge model test; deformation; design method; finite element method水利论文6M)IbM8n/A TD|

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TAG: 导师 挡土墙 贺会团 赵维炳 加筋
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