桩—土共同作用下承受荷载的管桩受力机理及工作性能研究

发布时间：2018-04-20 17:05

本文选题：桩基 + 大直径　；参考：《重庆交通大学》2014年硕士论文

【摘要】：桩基础具有承载力高、稳定性好、基础沉降及差异变形小、抗震性能好及具有对各种地质条件的适用性强等优点,被广泛应用于高层建筑、近海采油、大型桥梁工程建设、海岸码头及大型动力机器基础等实际工程中。随着土木建筑行业的发展,建筑结构的高度越来越高、且由于地址条件的日益不确定性及建筑结构与环境的关系日趋紧密,研究管桩基础在横向荷载作用下及竖向荷载作用下的内力、变形及破坏机理可以更好的解决工程实际问题。本文的研究工作如下:①研究竖向荷载与水平荷载下作用下管桩与土共同作用的方法,提出了各种方法的适用范围以及优缺点,因此在数值计算过程中,需要选择与工程相适应的计算方法,以提高计算结果的精度。②建立符合实际的大直径管桩模型,其中探讨了有限元建模时应注意单元选取原则及单元的选取;对比分析了三维及二维有限元管桩模型在竖向荷载作用下桩体的受力计算结果,得出用二维有限元模型可以代替三维模型进行管桩—土共同作用下的受力性状进行分析,结果能够满足要求。③研究竖向荷载作用下不同管桩参数对管桩受力性状及工作性能影响,得出不同结构参数对管桩的受力性状的影响程度,为选取合理的管桩参数以提高管桩的安全性及其工作性能的发挥提供依据。④探讨了水平荷载作用下不同管桩参数对管桩受力性状及工作性能影响,得出水平荷载作用下不同结构参数对管桩的桩身弯矩及水平位移的影响程度,以及竖向荷载对水平荷载作用下桩体的承载能力影响,并提出桩体受力破坏的结构构造措施,以提高水平荷载作用下桩基的安全性。
[Abstract]:The pile foundation has the advantages of high bearing capacity, good stability, small settlement and differential deformation, good seismic performance and strong applicability to various geological conditions. It has been widely used in high-rise buildings, offshore oil production and large-scale bridge construction. Coastal wharf and large-scale power machine foundation and other practical projects. With the development of civil construction industry, the height of building structure is higher and higher, and because of the uncertainty of address condition and the relationship between building structure and environment, Studying the internal force, deformation and failure mechanism of pipe pile foundation under transverse load and vertical load can better solve the practical engineering problems. The research work of this paper is as follows: 1. The methods of interaction between pipe pile and soil under vertical and horizontal loads are studied, and the applicable scope, advantages and disadvantages of these methods are put forward, so in the process of numerical calculation, In order to improve the accuracy of the calculation results, the practical large-diameter pipe pile model should be established. The principle of element selection and the selection of element should be paid attention to in finite element modeling. This paper compares and analyzes the calculation results of three dimensional and two dimensional finite element pipe pile model under vertical load, and concludes that the two dimensional finite element model can be used instead of three dimensional model to analyze the mechanical behavior of pipe pile and soil under the action of pipe pile and soil. The results can meet the requirement of .3 to study the influence of different parameters of pipe pile on the mechanical behavior and working performance of pipe pile under vertical load, and the degree of influence of different structural parameters on the mechanical behavior of pipe pile is obtained. In order to select reasonable pipe pile parameters to improve the safety and performance of pipe pile, the influence of different pipe pile parameters on the mechanical behavior and working performance of pipe pile under horizontal load is discussed. The influence of different structural parameters on the bending moment and horizontal displacement of pipe pile under horizontal load and the influence of vertical load on the bearing capacity of pile under horizontal load are obtained. In order to improve the safety of pile foundation under horizontal load.
【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】：TU473.1

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