带环墩预制挡土墙基础承载性状有限元分析

发布时间：2018-06-29 02:18

本文选题：挡土墙基础 + 极限平衡法　；参考：《湘潭大学》2017年硕士论文

【摘要】：在国家经济高速发展的大背景下,工业化、城镇化均在快速推进,诸多涉及到工业与民用建筑、道路和桥梁、港口等方面建设的规模和投入逐步加大,尤其是在丘陵地区的工程建设中,挡土墙是经常使用的支挡结构,如何更好地提高挡土墙建造中建设投资的效益、保证工程质量、改善建筑施工环境尤为重要。为了改善传统挡土墙基础承载性能,减少因地基承载性能不足、地基处理不当而导致的挡土墙事故,更好地保障建筑施工的安全,本文在前人研究的基础上,提出了带环墩预制挡土墙基础,该型式基础施工简便、性能出众、适用范围十分广泛,具有良好的市场前景。本文在国内外研究的基础上,通过理论与数值模拟相结合的研究方法,对带环、墩预制挡土墙基础的竖向承载性能和水平承载性能进行了系统研究,主要研究内容及成果如下:1.利用极限平衡法,深入分析了带环、墩预制挡土墙基础的结构特点、受力机制、破坏模式,并提出带环、墩预制挡土墙基础的竖向极限承载力和水平极限承载力的计算方法。分析表明,带环、墩预制挡土墙基础明显改善了传统挡土墙基础的承载性能,在竖向极限承载力和水平极限承载力比较中,该种基础型式均要优于传统基础。2.通过数值模拟的手段,分别建立板、带方环、带方墩、带圆环、带圆墩五种挡土墙基础模型,系统分析了带环、墩预制挡土墙基础在不同加载方式、不同土质下的承载性状。数值计算结果表明,在粘土和砂土中,带环、墩预制挡土墙基础的承载性能均要优于传统板基础。在竖向极限承载力和基础沉降的的比较中:带方环、方墩基础性能最佳,带圆环、圆墩基础次之,板基础最差;在水平极限承载力的比较中,性能从优到劣依次是:带方环基础、带圆环基础、带方墩基础、带圆墩基础、板基础。3.结合理论和有限元分析结果,对综合性能最好的带方环基础提出了增大方环高度、减小方环厚度、增加方环外边长三种优化方案,并通过数值模拟进行了验证计算。结果表明,三种措施均能够有效提高带方环基础模型的承载性能。
[Abstract]:Under the background of the rapid development of the national economy, industrialization and urbanization are advancing rapidly. The scale and investment of many aspects related to industrial and civil construction, roads and bridges, ports, etc., are gradually increasing. Especially in the engineering construction in hilly areas, retaining wall is often used as a retaining structure. How to improve the efficiency of construction investment, ensure engineering quality and improve construction environment is particularly important. In order to improve the bearing capacity of traditional retaining wall foundation, reduce the accidents of retaining wall caused by insufficient bearing capacity of foundation and improper treatment of foundation, and better protect the safety of construction, this paper is based on the previous research. The prefabricated retaining wall foundation with ring piers is put forward. This type foundation is simple in construction, outstanding in performance, wide in application range and has a good market prospect. Based on the research at home and abroad, the vertical bearing performance and horizontal bearing performance of the foundation with ring and piers are studied systematically by the combination of theory and numerical simulation. The main research contents and results are as follows: 1. By using the limit equilibrium method, the structural characteristics, stress mechanism and failure mode of the foundation of precast retaining wall with ring and pier are deeply analyzed, and the calculation methods of vertical ultimate bearing capacity and horizontal ultimate bearing capacity of the foundation with ring and pier are put forward. The analysis shows that the bearing capacity of the traditional retaining wall foundation is improved obviously with ring and pier precast retaining wall foundation. In the comparison of vertical ultimate bearing capacity and horizontal ultimate bearing capacity, this foundation type is superior to traditional foundation. By means of numerical simulation, five kinds of retaining wall foundation models are established, such as plate, square ring, square pier, circular ring and circular pier, respectively. The bearing behavior of the foundation with ring and pier under different loading modes and different soil quality is analyzed systematically. The numerical results show that the bearing capacity of the foundation with ring and pier prefabricated retaining wall is better than that of the traditional plate foundation in clay and sand. In the comparison of vertical ultimate bearing capacity and foundation settlement: with square ring, square pier foundation is the best, circular pier foundation is second, circular pier foundation is the worst, plate foundation is the worst, in horizontal ultimate bearing capacity comparison, The order of performance from good to bad is: with square ring foundation, with square pier foundation, with round pier foundation, with plate foundation. Based on the results of theory and finite element analysis, three optimization schemes of increasing the height of the square ring, reducing the thickness of the square ring and increasing the outer side length of the square ring are proposed for the foundation with the best comprehensive performance. The results are verified and calculated by numerical simulation. The results show that the three measures can effectively improve the bearing capacity of the basic model with square ring.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476.4

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