复合地基中现浇X形单桩特性研究
发布时间：2018-08-14 16:28
【摘要】：刚性桩复合地基因其在处理软土地区能够较好地控制沉降变形,其能够很好地穿过不良地基,对提高路基的承载能力和控制道路的工后沉降都起到了很好的工程经济效益。又因刚性桩复合地基大量运用于工程之中,在工程的施工过程中,以及工程投入运营和使用后,收集到了大量关于刚性桩复合地基的工程数据,不断地改进其设计,使得刚性桩复合地基的工程技术、理论得到了快速地进步,也推动刚性桩复合地基向着更成熟化的方向发展；与此同时也产生了许多新型桩形,其中现浇X形混凝土桩技术就是由河海大学开发的具有自主知识产权的新型专利技术。本文在相关研究现状的基础上,建立单桩复合地基计算模型,通过考虑现浇X形桩侧凹弧段土拱效应,令凹弧段侧摩阻力与凸出段侧摩阻力比值为m,并对不同土层的土体参数对m影响进行了分析,并将现有的圆形桩侧摩阻力计算公式进行推广应用得到了现浇X形桩侧摩阻力计算公式。同时借助大型有限元分析软件ABAQUS建立有限元单桩复合地基模型,并针对不同的工况条件下建立数值模拟分析模型,比较现浇X形单桩复合地基与圆形单桩复合地基的异同。 本文开展的主要工作包括以下几个方面： 1、通过阅读现有有关圆形刚性桩复合地基相关文献,得出普通桩型的一般规律；结合对X形桩凹弧段土拱效应分析,得出桩凸出段与凹弧段侧摩阻力沿桩周同一深度处的分布规律； 2、利用(1)中分布规律,结合现有桩侧摩阻力计算方法-荷载传递法,通过以能量法建立平衡方程,求解出均质地基土中X形单桩侧摩阻力沿桩身分布规律； 3、运用与均质地基土相同计算方法,计算多层地基土中X形单桩侧摩阻力沿桩身分布规律,并与实际工程测量数据进行对比分析； 4、利用有限元分析软件ABAQUS建立X形单桩复合地基计算模型及圆形单桩复合地基模型,对两种桩型复合地基在相同的工况条件下,改变褥垫层变形模量、厚度、桩身模量以及桩端土体变形模量的大小,分别对比分析以上各种工况下两种单桩复合地基承载特点、沉降、桩身轴力与桩侧摩阻力的变化规律； 5、通过数值分析软件结合现浇x形桩复合地基分析修正剑桥模型中主要参数变化对复合地基计算结果的影响进行了分析讨论,为今后类似的工程在使用修正剑桥模型选取计算参数时提供参考借鉴。
[Abstract]:The rigid pile composite soil gene can control the settlement and deformation in the soft soil area, and it can well pass through the bad foundation, which can improve the bearing capacity of the roadbed and control the post-construction settlement of the road. Because rigid pile composite foundation is widely used in engineering, in the process of construction, and after the project is put into operation and use, a large amount of engineering data about rigid pile composite foundation are collected, and its design is continuously improved. The engineering technology of rigid pile composite foundation has made rapid progress in theory, and has also promoted the development of rigid pile composite foundation towards a more mature direction. At the same time, many new types of pile have been produced. The cast-in-place X-shaped concrete pile technology is a new patent technology with independent intellectual property developed by Hehai University. In this paper, based on the related research status, the calculation model of single pile composite foundation is established, and the soil arch effect of side concave arc section of cast-in-place X pile is considered. The ratio of the side friction of the concave arc segment to the side friction resistance of the protruding section is m, and the influence of soil parameters of different soil layers on m is analyzed. The formulas for calculating the lateral friction of cast-in-place X-shaped piles are obtained by popularizing the existing formulas for calculating the lateral friction of circular piles. At the same time, the finite element model of single pile composite foundation is established with the help of the large finite element analysis software ABAQUS, and the numerical simulation analysis model under different working conditions is established to compare the similarities and differences between cast-in-situ single pile composite foundation and circular single pile composite foundation. The main work of this paper includes the following aspects: 1. By reading the existing literature on circular rigid pile composite foundation, the general rule of common pile type is obtained, and the soil arch effect of X shaped pile concave arc section is analyzed. The distribution law of lateral friction of protruded pile and concave arc along the same depth around the pile is obtained. 2. By using the distribution law of (1), combined with the load transfer method, the equilibrium equation is established by energy method. The distribution law of lateral friction of X shape single pile along the pile body in homogeneous foundation soil is solved. 3, the same calculation method as that of homogeneous foundation soil is used to calculate the distribution law of side friction of X shape single pile along pile body in multi layer foundation soil. And compared with the actual engineering survey data. 4, using the finite element analysis software ABAQUS to establish the X shape single pile composite foundation calculation model and circular single pile composite foundation model, Under the same working conditions, the bearing characteristics of two kinds of pile-type composite foundation are compared and analyzed by changing the deformation modulus, thickness, pile body modulus and pile end soil deformation modulus of the two kinds of pile composite foundation under the same working conditions. Settlement, axial force of pile body and friction on the side of pile; 5. The influence of the main parameters of Cambridge model on the calculation results of composite foundation is analyzed and discussed by using numerical analysis software combined with cast-in-place x-shaped pile composite foundation analysis. It provides a reference for similar projects in the future when selecting calculation parameters using the modified Cambridge model.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU470
本文编号：2183444
[Abstract]:The rigid pile composite soil gene can control the settlement and deformation in the soft soil area, and it can well pass through the bad foundation, which can improve the bearing capacity of the roadbed and control the post-construction settlement of the road. Because rigid pile composite foundation is widely used in engineering, in the process of construction, and after the project is put into operation and use, a large amount of engineering data about rigid pile composite foundation are collected, and its design is continuously improved. The engineering technology of rigid pile composite foundation has made rapid progress in theory, and has also promoted the development of rigid pile composite foundation towards a more mature direction. At the same time, many new types of pile have been produced. The cast-in-place X-shaped concrete pile technology is a new patent technology with independent intellectual property developed by Hehai University. In this paper, based on the related research status, the calculation model of single pile composite foundation is established, and the soil arch effect of side concave arc section of cast-in-place X pile is considered. The ratio of the side friction of the concave arc segment to the side friction resistance of the protruding section is m, and the influence of soil parameters of different soil layers on m is analyzed. The formulas for calculating the lateral friction of cast-in-place X-shaped piles are obtained by popularizing the existing formulas for calculating the lateral friction of circular piles. At the same time, the finite element model of single pile composite foundation is established with the help of the large finite element analysis software ABAQUS, and the numerical simulation analysis model under different working conditions is established to compare the similarities and differences between cast-in-situ single pile composite foundation and circular single pile composite foundation. The main work of this paper includes the following aspects: 1. By reading the existing literature on circular rigid pile composite foundation, the general rule of common pile type is obtained, and the soil arch effect of X shaped pile concave arc section is analyzed. The distribution law of lateral friction of protruded pile and concave arc along the same depth around the pile is obtained. 2. By using the distribution law of (1), combined with the load transfer method, the equilibrium equation is established by energy method. The distribution law of lateral friction of X shape single pile along the pile body in homogeneous foundation soil is solved. 3, the same calculation method as that of homogeneous foundation soil is used to calculate the distribution law of side friction of X shape single pile along pile body in multi layer foundation soil. And compared with the actual engineering survey data. 4, using the finite element analysis software ABAQUS to establish the X shape single pile composite foundation calculation model and circular single pile composite foundation model, Under the same working conditions, the bearing characteristics of two kinds of pile-type composite foundation are compared and analyzed by changing the deformation modulus, thickness, pile body modulus and pile end soil deformation modulus of the two kinds of pile composite foundation under the same working conditions. Settlement, axial force of pile body and friction on the side of pile; 5. The influence of the main parameters of Cambridge model on the calculation results of composite foundation is analyzed and discussed by using numerical analysis software combined with cast-in-place x-shaped pile composite foundation analysis. It provides a reference for similar projects in the future when selecting calculation parameters using the modified Cambridge model.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU470
【引证文献】
相关硕士学位论文 前1条
1 屈江龙;桩承式加筋路堤承载性状研究[D];广东工业大学;2015年
，本文编号：2183444
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