深大基坑合理支护结构的研究
发布时间：2018-08-27 14:29
【摘要】：近些年来,经济政策的不断刺激,加快了大都市化建设的步伐,全国范围内的大中城市呈现出城市中央区繁荣,郊区待开发的特征。与此同时,交通拥堵问题日渐突出,亟待提升城市客运交通系统的服务能力是人们面对的新课题。而就工程领域来看,地铁车站深基坑随之增多,不同类型深基坑的内力与变形规律是每个工程技术人员需要着重研究的。本文以广州市地铁某深基坑工程为例,利用理正深基坑7.0与数值模拟软件MIDAS GTS NX分别计算该深大基坑的支护方案,结果表明理正深基坑7.0软件以《建筑基坑支护技术规程》为理论基础进行计算,相较于有限元求解的结果偏大趋于保守。利用数值模拟软件建立地连墙墙厚与嵌固深度两种变量的三维数值分析模型,研究总结不同变量对基坑水平变形,周边地表沉降,围护结构弯矩,内支撑所受轴力,钢立柱相对沉降的影响规律。本文的主要研究内容如下:(1)阅读大量文献,从深大基坑工程设计理论与合理研究方法两个方面论述了深基坑工程的研究现状。详细阐述了支护结构与内支撑结构的分类形式以及各自的适用范围,支护结构与内支撑结构的内力与变形计算方法。(2)研究了理正深基坑软件的优势与局限性,并利用该软件计算支护结构,结果表明本基坑工程的水平位移,竖向沉降,以及稳定性验算结果均小于《基坑工程手册》中的规范值,说明该支护结构是安全的。(3)结合地勘报告,定义材料属性,确定基坑约束与周边荷载,采用MIDAS GTS NX有限元软件建立三维有限元模型,分析了该深大基坑水平变形,竖向沉降,围护结构弯矩,支撑轴力等结果。通过与理正深基坑计算结果对比分析,得出理正深基坑计算结果偏大,较保守。(4)通过数值模拟分析了地下连续墙墙厚和嵌固深度的变化对基坑内力与变形的影响规律,得出两者对基坑变形的影响都存在一个临界值。基于位移安全储备系数研究了墙厚与嵌固深度的合理取值,在工程实践中适当地增加地连墙的墙厚与嵌固深度能够有效控制基坑变形。(5)将有限元软件求解的结果与实际现场监测结果进行对比分析发现,两者的侧向变形的差值为2.2mm,沉降量的差值为4.12mm,且变化趋势一致,证明了该基坑工程的数值模拟结果对基坑支护结构设计与基坑开挖施工具有参考意义与指导作用。
[Abstract]:In recent years, the economic policy has accelerated the pace of the construction of metropolis. The large and medium-sized cities in the whole country show the characteristics of urban central district prosperity and suburbs to be developed. At the same time, the problem of traffic congestion is becoming more and more serious, and it is a new task for people to improve the service capacity of urban passenger transport system. In the field of engineering, the deep foundation pit of subway station increases with it, and the internal force and deformation law of different types of deep foundation pit need to be studied by every engineer and technician. Taking a deep foundation pit project of Guangzhou Metro as an example, the support scheme of this deep foundation pit is calculated by using Lizheng 7.0 and numerical simulation software MIDAS GTS NX, respectively. The results show that the calculation of Lizheng Deep Foundation Pit 7.0 software is based on the Technical Specification for supporting of Building Foundation Pit, which tends to be conservative compared with the results obtained by finite element method. By using numerical simulation software, a three-dimensional numerical analysis model of two variables of wall thickness and embedded depth is established, and the axial force of different variables on horizontal deformation of foundation pit, surface settlement around the foundation pit, bending moment of enclosure structure and inner bracing is studied and summarized. The influence law of relative settlement of steel column. The main contents of this paper are as follows: (1) through reading a large number of literatures, this paper discusses the research status of deep foundation pit engineering from two aspects: design theory and reasonable research method. The classification forms of supporting structure and inner bracing structure and their respective application scope, the calculation method of internal force and deformation of supporting structure and inner bracing structure are described in detail. (2) the advantages and limitations of software of Lizheng deep foundation pit are studied. The results show that the horizontal displacement, vertical settlement and stability of the foundation pit are less than the standard values in the Manual of Foundation Pit Engineering. (3) combined with geological prospecting report, defining material attribute, determining foundation pit constraint and peripheral load, using MIDAS GTS NX finite element software to establish three-dimensional finite element model, analyzing horizontal deformation and vertical settlement of deep and large foundation pit. The results of bending moment, supporting axial force and so on. By comparing and analyzing the calculation results of Lizheng deep foundation pit, it is concluded that the calculation results of Lizheng deep foundation pit are larger and more conservative. (4) through numerical simulation, the influence of the thickness of underground continuous wall and the depth of embedded wall on the internal force and deformation of foundation pit is analyzed. It is concluded that there is a critical value for both of them to the deformation of foundation pit. Based on the displacement safety reserve coefficient, the reasonable value of wall thickness and embedded depth is studied. In engineering practice, the deformation of foundation pit can be effectively controlled by increasing the wall thickness and the embedded depth of the ground connecting wall. (5) comparing the results of finite element software with the actual field monitoring results, it is found that, The difference of lateral deformation and settlement is 2.2mm and 4.12mm respectively, and the variation trend is the same. It is proved that the numerical simulation results of the foundation pit engineering have reference significance and guiding function for the design of foundation pit supporting structure and excavation construction.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473
本文编号：2207562
[Abstract]:In recent years, the economic policy has accelerated the pace of the construction of metropolis. The large and medium-sized cities in the whole country show the characteristics of urban central district prosperity and suburbs to be developed. At the same time, the problem of traffic congestion is becoming more and more serious, and it is a new task for people to improve the service capacity of urban passenger transport system. In the field of engineering, the deep foundation pit of subway station increases with it, and the internal force and deformation law of different types of deep foundation pit need to be studied by every engineer and technician. Taking a deep foundation pit project of Guangzhou Metro as an example, the support scheme of this deep foundation pit is calculated by using Lizheng 7.0 and numerical simulation software MIDAS GTS NX, respectively. The results show that the calculation of Lizheng Deep Foundation Pit 7.0 software is based on the Technical Specification for supporting of Building Foundation Pit, which tends to be conservative compared with the results obtained by finite element method. By using numerical simulation software, a three-dimensional numerical analysis model of two variables of wall thickness and embedded depth is established, and the axial force of different variables on horizontal deformation of foundation pit, surface settlement around the foundation pit, bending moment of enclosure structure and inner bracing is studied and summarized. The influence law of relative settlement of steel column. The main contents of this paper are as follows: (1) through reading a large number of literatures, this paper discusses the research status of deep foundation pit engineering from two aspects: design theory and reasonable research method. The classification forms of supporting structure and inner bracing structure and their respective application scope, the calculation method of internal force and deformation of supporting structure and inner bracing structure are described in detail. (2) the advantages and limitations of software of Lizheng deep foundation pit are studied. The results show that the horizontal displacement, vertical settlement and stability of the foundation pit are less than the standard values in the Manual of Foundation Pit Engineering. (3) combined with geological prospecting report, defining material attribute, determining foundation pit constraint and peripheral load, using MIDAS GTS NX finite element software to establish three-dimensional finite element model, analyzing horizontal deformation and vertical settlement of deep and large foundation pit. The results of bending moment, supporting axial force and so on. By comparing and analyzing the calculation results of Lizheng deep foundation pit, it is concluded that the calculation results of Lizheng deep foundation pit are larger and more conservative. (4) through numerical simulation, the influence of the thickness of underground continuous wall and the depth of embedded wall on the internal force and deformation of foundation pit is analyzed. It is concluded that there is a critical value for both of them to the deformation of foundation pit. Based on the displacement safety reserve coefficient, the reasonable value of wall thickness and embedded depth is studied. In engineering practice, the deformation of foundation pit can be effectively controlled by increasing the wall thickness and the embedded depth of the ground connecting wall. (5) comparing the results of finite element software with the actual field monitoring results, it is found that, The difference of lateral deformation and settlement is 2.2mm and 4.12mm respectively, and the variation trend is the same. It is proved that the numerical simulation results of the foundation pit engineering have reference significance and guiding function for the design of foundation pit supporting structure and excavation construction.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473
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