大水位差码头钢护筒与钢筋混凝土桩的水平受力特性分析

发布时间：2019-03-13 21:52

【摘要】：本文基于重庆交通科技项目“蓄水后三峡工程重庆港码头建设关键技术研究”，分别通过理论分析、物理模型试验和有限元数值模拟方法，对钢护筒嵌岩桩的水平受力特性进行研究。主要的研究内容和相关结论有：（1）结合钢管混凝土桩理论，系统分析了大直径嵌岩桩及钢管混凝土柱受力特性，提出了基于组合刚度的m法计算钢护筒嵌岩桩水平承载能力，通过分别考虑有无钢护筒两种情况对比分析，，可以看出考虑了钢护筒效应后桩基水平承载能力大幅提高。（2）根据相似理论，结合实际工程，完成了模型设计，包括模型材料的确定，材料参数的确定，模型材料的换算，模型的制作，加载设计、测点断面的布置等。制成有、无钢护筒时嵌岩深度分别3D、4D、5D共6根桩进行了水平承载性状试验。在水平荷载作用下，钢护筒嵌岩桩相比普通嵌岩桩，水平承载能力大幅提高、水平位移大幅降低。（3）参考室内模型实验参数应用大型数值模拟用软件ABAQUS创建数值模型，将有限元结果与室内模型试验数据对比，结果吻合，进而验证了数值模拟的可行性、有效性。建立以果园港二期工程桩基原型参数为基础的有限元模型，分析发现在水平荷载作用下钢护筒分担了约80%的应力；通过对嵌岩深度、钢护筒壁厚、有无上覆盖层、有无泥皮、钢护筒有无带肋条等分析探讨了钢护筒水平承载能力的影响因素，并进行各影响因素的敏感度分析，进而提出相应的改善措施。
[Abstract]:Based on Chongqing Transportation Science and Technology Project "Research on the key Technology of Chongqing Transportation Science and Technology Project after impoundment", through theoretical analysis, physical model test and finite element numerical simulation method, The horizontal stress characteristics of steel retaining pipe rock socketed pile are studied. The main research contents and related conclusions are as follows: (1) based on the theory of concrete-filled steel tube pile, the mechanical characteristics of large diameter rock-socketed pile and concrete-filled steel tube column are systematically analyzed. The m method based on composite stiffness is put forward to calculate the horizontal bearing capacity of steel retaining tube rock socketed pile. Through the comparison and analysis of whether or not there is steel shield, it can be seen that the horizontal bearing capacity of pile foundation is greatly improved after considering the effect of steel shield. (2) according to the similarity theory and practical engineering, the model design is completed, including the determination of the model material, the determination of the material parameters, the conversion of the model material, the making of the model, the loading design, the layout of the section of the measuring point, and so on. Six piles (3D, 4D, 5D) with and without steel shield were tested for the horizontal load-bearing behavior of the piles with different rock socketed depths of 3 D, 4 D and 5 D respectively. Under the action of horizontal load, the horizontal bearing capacity of steel pipe rock-socketed pile is greatly improved and the horizontal displacement is greatly reduced compared with ordinary rock-socketed pile. (3) using the large-scale numerical simulation software ABAQUS to create the numerical model according to the experimental parameters of the indoor model, and comparing the finite element results with the experimental data of the indoor model, the results are in good agreement, and the feasibility and effectiveness of the numerical simulation are verified. A finite element model based on prototype parameters of pile foundation of Orchard Port II project is established. It is found that the steel protector can share about 80% of the stress under the action of horizontal load. Based on the analysis of the depth of rock socketed, the thickness of steel shield wall, the overlying layer, the mud cover and the ribbed strip, the influence factors of the horizontal bearing capacity of steel shield tube are discussed, and the sensitivity analysis of each influence factor is carried out. Then the corresponding improvement measures are put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.1

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