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搅拌桩复合地基受力变形和沉降计算方法研究(陈东)

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搅拌桩复合地基受力变形和沉降计算方法研究水利论文C,y*i` Nl)w^0Rn.u

$Fmj4f_L0【作者】陈东 【导师】何开胜
^;x(H Gng4f0【作者基本信息】南京水利科学研究院,岩土工程,2006年,硕士水利论文{%Vq [J p+b

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dy8e,KxdW~0【中文摘要】 搅拌桩地基沉降计算的准确性取决于搅拌桩复合地基中附加应力的分布,特别是下卧层应力的分布。在前人研究成果的基础上,本文对搅拌桩的变形发生机理进行了研究,探求了搅拌桩复合地基沉降计算的合理方法。 首先,采用Boussinesq解法和Boussinesq & Mindlin联合求解法对搅拌桩复合地基进行了弹性分析,研究了Boussinesq & Mindlin联合求解法中桩侧摩阻力设置位置对附加应力分布的影响,指出了当前不少文献中侧摩阻力的简化方式会大大高估地基中的附加应力值。计算结果与工程观测结果相比,发现Boussinesq解法会高估地基中的附加应力,使计算沉降偏大;而Boussinesq & Mindlin联合解法由于考虑了桩土间的相互作用,其结果较符合实际。然后,使用弹塑性有限元方法分析了均质地基和搅拌桩复合地基,研究了地基中特别是下卧层顶面处附加应力的分布规律,结果表明下卧层顶面处桩端土有较大的应力集中,其程度随深度的增加减小并消失。因此,用常规的分层总和法进行沉降计算时,Boussinesq & Mindlin联合求解法求解的下卧层顶面处附加应力应...更多考虑桩端土和桩间土的差异,需进行面积平均。此外,还分析了桩长、桩径、桩距、桩土模量比等因素对附加应力分布的影响。 在现有复合地基沉降计算方法的基础上,结合本文弹性理论方法和有限元方法对搅拌桩复合地基中附加应力分布的研究,借鉴相关研究的一些有益思路,对搅拌桩复合地基沉降计算方法中附加应力分布计算、下卧层顶面附加应力取值、土的压缩模量三个方面进行了修正改进。针对Boussinesq & Mindlin联合求解法计算复杂、难以设计应用的状况,提出了相应的简化计算公式及其附加应力计算表。最后,计算了一个工程实例,初步检验了所建议方法的可行性。  还原水利论文UNN&Y?1S ['^

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【英文摘要】 The accuracy of settlement calculation of composite foundation with mixing piles depends on the additional stress distribution in the foundation, especially in the subjacent bed. Based on the previous research results, the deformation mechanism of mixing piles is studied and a proper method of settlement calculation is discussed and proposed.First, the elastic analysis of composite foundation with mixing piles is carried out by application of Boussinesq method and Boussinesq and Mindlin united method. In the united method, the influence of the acting position of skin friction of piles on the additional stress distribution is analyzed. It is pointed out that the simplified mode of skin friction of piles in some present literature papers results in the overvaluation of additional stress of the foundation. Compared the calculating results with the observation ones, it is found that the additional stress calculated is overvalued in Boussinesq method, resulting overvaluation of calculation ...更多settlement. Because the interaction between piles and soil is considered in the united method, so its calculation results accord with the true value. Then, elastic-plastic finite element method is applied on homogeneous ground and composite foundation with mixing piles. The regulation of additional stress distribution in the foundation especially on the top surface of subjacent bed is studied. The calculation results indicate there is great stress concentration in the bottom of mixing piles, and the degree of stress concentration decreases with the depth and disappears rapidly. Hence, the calculation of additional stress on the top surface of subjacent bed using the united method should be considered in layerwise summation method, the stress difference between the bottom of piles and the soil around the piles and the area weighted average value is proposed. Further more, some influencing factors on additional stress distribution, such as the length, radius and spacing of piles,  还原

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【中文关键词】 搅拌桩; Mindlin解; 桩侧摩阻力; 有限元; 附加应力; 沉降计算方法
\7k,l0g4K&n;q0【英文关键词】 mixing pile; Mindlin solution; skin friction of pile; finite element method; additional stress; method of settlement calculation
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TAG: 陈东 计算方法 地基 沉降 复合
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