钻孔灌注桩载荷试验与承载性能分析
发布时间：2019-05-24 15:35
【摘要】：伴随着高层建筑的发展，桩基作为建筑结构中基础的形式之一也得到了快速发展。因为建筑越来越高，基底压力就越来越大，普通的基础也就满足不了需要。钻孔灌注桩作为承受上部荷载的一种基础型式，具有承载力大、变形小的特点，被广泛地应用到高层、超高层建筑中去。因桩的承载力比较高，试验起来就会比较困难，试验中得到的资料往往不是很完整，因此给桩的承载性能研究带来了诸多困难。本文以国内某工程项目A区高承载力钻孔灌注桩为研究对象，通过现场试验、理论分析、有限元模拟相结合，对钻孔灌注桩的承载性能做出了一些研究。具体内容为： （1）收集资料与现场勘探后对试验桩的试验方案进行了设计，据此对两根灌注桩进行了加载试验。因本工程的试验桩拟兼作工程桩用，所以未加荷至极限，获得桩的承载力与土层的侧摩阻力为最大值（≤极限值），以此数据为基础进行了荷载传递与侧摩阻力分析研究。 （2）应用广义协调法对桩和土之间的相互作用进行分析，，分析的结果与试验桩测试结果吻合较好。 （3）基于试验桩的设计参数，利用ANSYS建立模型，分析了钻孔灌注桩在荷载作用下桩顶的沉降、桩周土体的变形、桩身的轴力以及桩周的侧摩阻力；在其它参数不变的情况下，分别改变桩径、桩长、土体变形模量、土体粘聚力和内摩擦角等条件对桩进行模拟，检验这些因素对桩在承载性能方面的影响。
[Abstract]:With the development of high-rise buildings, pile foundation, as one of the foundation forms of building structures, has also been developed rapidly. Because the building is higher and higher, the base pressure is greater and greater, the ordinary foundation can not meet the needs. Bored cast-in-place pile, as a kind of foundation type subjected to upper load, has the characteristics of large bearing capacity and small deformation, and is widely used in high-rise and super-high-rise buildings. Because of the high bearing capacity of the pile, it will be more difficult to test, and the data obtained in the test are often not very complete, so it brings a lot of difficulties to the study of the bearing capacity of the pile. In this paper, the high bearing capacity bored pile in area A of an engineering project in China is taken as the research object, and the bearing capacity of bored cast-in-place pile is studied through field test, theoretical analysis and finite element simulation. The specific contents are as follows: (1) after collecting the data and field exploration, the test scheme of the test pile is designed, and the loading test of two cast-in-place piles is carried out. Because the test pile of this project is intended to be used as the pile of the project, the bearing capacity of the pile and the lateral friction resistance of the soil layer are obtained as the maximum value (鈮
本文编号：2484983
[Abstract]:With the development of high-rise buildings, pile foundation, as one of the foundation forms of building structures, has also been developed rapidly. Because the building is higher and higher, the base pressure is greater and greater, the ordinary foundation can not meet the needs. Bored cast-in-place pile, as a kind of foundation type subjected to upper load, has the characteristics of large bearing capacity and small deformation, and is widely used in high-rise and super-high-rise buildings. Because of the high bearing capacity of the pile, it will be more difficult to test, and the data obtained in the test are often not very complete, so it brings a lot of difficulties to the study of the bearing capacity of the pile. In this paper, the high bearing capacity bored pile in area A of an engineering project in China is taken as the research object, and the bearing capacity of bored cast-in-place pile is studied through field test, theoretical analysis and finite element simulation. The specific contents are as follows: (1) after collecting the data and field exploration, the test scheme of the test pile is designed, and the loading test of two cast-in-place piles is carried out. Because the test pile of this project is intended to be used as the pile of the project, the bearing capacity of the pile and the lateral friction resistance of the soil layer are obtained as the maximum value (鈮
本文编号：2484983
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