多支点深基坑支护体系受力性状研究

发布时间：2018-07-20 20:57

【摘要】：随着城市建设的快速发展,城市中土地资源越来越紧张。越来越多的高层、超高层建筑拔地而起,为了充分利用空间,城市的开发建设开始向地下空间发展,深基坑工程应运而生。要保证深基坑工程的安全施工,就必须做好基坑的支护。目前基坑支护工程主要是有效控制支护结构的受力和变形,以保证基坑工程的安全施工。本文以长沙地铁橘子洲车站深基坑工程为例,分别采用解析方法和数值模拟方法对基坑施工过程中支护结构的受力进行了分析,得到了支护结构内力的变化规律,并与实际监测结果进行了对比,此外,还分析了施工方法、支撑刚度及支撑预加轴力对支护体系内力的影响。文章的主要工作有：(1)查阅资料与文献,阐述了深基坑工程支护结构设计及内力计算的研究现状,介绍了支护结构的设计原则,并总结了基坑支护结构内力计算方法、经典土压力理论及有限元理论。(2)采用解析方法和经典土力学理论计算支护结构的受力,并分析了支撑轴力的变化规律。(3)通过Midas-GTS三维有限元软件对基坑的开挖过程进行建模分析,模拟基坑分步开挖的施工过程,得到了基坑支护体系内力的大小及分布规律。(4)整理实际监测结果,得到了实际施工过程中支护结构的内力和位移,并与解析方法与数值模拟方法得到的结果进行了对比。(5)利用三维有限元软件,改变施工方式和支护结构设计参数,研究二者对支护体系内力变化的影响。
[Abstract]:With the rapid development of urban construction, urban land resources are becoming more and more tight. More and more high-rise buildings rise to the ground. In order to make full use of the space, the development and construction of the city begin to develop to the underground space, and the deep foundation pit project emerges as the times require. In order to ensure the safe construction of deep foundation pit engineering, we must do a good job of foundation pit support. At present, the main purpose of foundation pit support engineering is to control the force and deformation of supporting structure effectively, so as to ensure the safe construction of foundation pit engineering. Taking the deep foundation pit project of Zhuzizhou Station of Changsha Metro as an example, the stress of supporting structure during foundation pit construction is analyzed by analytic method and numerical simulation method respectively, and the law of internal force variation of supporting structure is obtained. In addition, the effects of construction method, support stiffness and pre-axial force on the internal force of supporting system are analyzed. The main work of this paper is as follows: (1) referring to the data and literature, this paper expounds the present situation of the research on the design and calculation of the internal force of the retaining structure of deep foundation pit, introduces the design principle of the supporting structure, and summarizes the calculation method of the internal force of the supporting structure of the foundation pit. Classical earth pressure theory and finite element theory. (2) the stress of supporting structure is calculated by analytic method and classical soil mechanics theory, and the variation law of supporting axial force is analyzed. (3) the excavation process of foundation pit is modeled and analyzed by Midas-GTS three-dimensional finite element software. The size and distribution of the internal force of the foundation pit support system are obtained by simulating the construction process of the excavation step by step. (4) the actual monitoring results are arranged and the internal force and displacement of the supporting structure are obtained in the actual construction process. The results obtained by analytical method and numerical simulation method are compared. (5) the influence of the two methods on the internal force of the support system is studied by changing the construction mode and the design parameters of the supporting structure by using the three-dimensional finite element software.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU473.2

【共引文献】