抗拔桩承载特性的试验研究与数值模拟

发布时间：2018-04-15 12:37

本文选题：抗拔桩 + 承载特性　；参考：《沈阳建筑大学》2015年硕士论文

【摘要】：随着我国经济技术的不断发展,地下空间的开发应用越来越广泛,桩基础工程在工程建设中发挥着十分重要的作用,尤其是抗拔桩基础的广泛应用迫切要求一种普遍适用的理论保证抗拔桩的安全使用。在此背景之下,本文主要进行以下几个方面的工作：(1)对桩基础的发展历史进行阐述,总结抗拔桩的研究现状,包括现场试验研究、模型试验研究和数值模拟分析等。(2)介绍抗拔桩基础的理论研究。在相关参考文献的基础上分析抗拔桩的破坏形态、抗拔桩和承压桩荷载传递机理的异同和抗拔桩承载力的计算方法。(3)以沈阳恒隆市府发展广场的抗拔桩检测试验为依托,对抗拔桩的荷载-位移关系、桩身轴力和桩侧摩阻力的测试结果进行分析,利用试验结果研究抗拔桩承载特性。同时,分析了后注浆工艺对于改善抗拔桩承载特性的有利作用。(4)利用数值分析软件FLAC3D按照桩周土、桩和接触面单元分别建立简化的数值分析模型,进行三维数值模拟,得到了抗拔桩在各级荷载作用下的位移特征云图、应力特征云图。(5)利用沈阳恒隆市府发展广场破坏性试验的抗拔桩TP4的荷载-位移关系、桩身轴力实测结果与数值模拟计算结果进行对比及二者产生误差原因进行分析,证明数值分析模型的合理性。利用验证后的数值分析模型分析桩长、桩径和桩侧摩擦系数对抗拔桩承载特性的影响。
[Abstract]:With the continuous development of economy and technology in our country, the development and application of underground space is more and more extensive. Pile foundation engineering plays a very important role in engineering construction.In particular, the wide application of the pile foundation requires a universal theory to ensure the safe use of the pile.Under this background, this article mainly carries on the following several aspects of work: 1) to the pile foundation development history, summarizes the research present situation, including the field test research,Model test and numerical simulation analysis are introduced in this paper.On the basis of relevant references, this paper analyzes the failure pattern of the uplift pile, the similarities and differences between the load transfer mechanism of the uplift pile and the bearing capacity of the pile, and the calculation method of the bearing capacity of the pile, which is based on the test test of the anti-pulling pile in the Development Square of Shenyang Henglong City Government.The load-displacement relation, the axial force of pile body and the frictional resistance of pile side are analyzed, and the load-bearing characteristics of the pile are studied by using the test results.At the same time, the beneficial effect of post-grouting technology on improving the bearing characteristics of uplift pile is analyzed. The simplified numerical analysis model is established by using numerical analysis software FLAC3D according to the soil around the pile, the pile and the contact surface unit, and the three-dimensional numerical simulation is carried out.The displacement characteristic cloud map and stress characteristic cloud map of the uplift pile under various loads are obtained. The load-displacement relationship of the uplift pile TP4, which is developed by the destructive square test in Henglong City, Shenyang, is obtained.The comparison between the measured results of the axial force of the pile body and the results of numerical simulation and the analysis of the causes of the errors are carried out to prove the rationality of the numerical analysis model.The influence of pile length, diameter and friction coefficient on the bearing capacity of pulled piles is analyzed by using the verified numerical analysis model.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473.1

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