深基坑开挖监测数据分析及有限元模拟研究
发布时间：2019-04-21 14:30
【摘要】：随着我国现代化建设的进行，城市大量高层、超高层建筑的兴建以及城市地下空间的利用，使得深基坑工程大量涌现，特别是天津地区，由于其紧邻渤海湾，所以其地下软土层较厚而且分布广泛。 而对于在城市中心、周边环境复杂的地段进行的超深基坑开挖的工程，更加存在着巨大的风险。所以，对软土地区超深基坑开挖过程中的基坑变形性研究具有重要的工程意义。本文以天津闹市区建筑物密集区某工程为研究背景，采用有限元软件ABAQUS对该工程的基坑开挖过程进行有限元模拟分析。 本文的具体工作有： （1）在大量阅读文献的基础上，，综述了基坑开挖过程中的基坑变形分析以及控制理论。 （2）通过分析实际工程基坑开挖过程中地连墙变形监测数据得出，地连墙顶部的水平位移超出报警值范围，很大程度上因为第一道水平支撑的架设位置太低，使得地连墙悬臂长度太大，造成水平位移偏大。同时通过对实测的水平支撑的数据研究，得出了支撑体系的内力变化规律。 （3）采用有限元软件ABAQUS对实际工程进行模拟，通过分析模拟结果得出基坑的变形规律。 （4）对比实测数据的变形规律和模拟得出的变形规律，二者的变形数据有一定差异，但是整体变形规律相似。 通过有限元方法得出的计算结果虽然会与实际工程存在一定的偏差，但是通过模拟得出的结果还是可以为实际基坑开挖工程的设计与施工提供一定的理论指导，而实际的监测结果也会对有限元软件模拟的进一步优化和完善提供实际的数据。
[Abstract]:With the development of modernization in China, the construction of a large number of urban high-rise, super-high-rise buildings and the utilization of urban underground space have led to the emergence of a large number of deep foundation pit projects, especially in Tianjin, due to its immediate proximity to the Bohai Bay. Therefore, the underground soft soil layer is thick and widely distributed. In the center of the city, there is a great risk to the excavation of the super-deep foundation pit in the complicated area of the surrounding environment. Therefore, it is of great engineering significance to study the deformation of super-deep foundation pit in soft soil area. In this paper, based on a project in the dense area of buildings in downtown Tianjin, finite element software ABAQUS is used to simulate and analyze the excavation process of the foundation pit. The concrete work of this paper is as follows: (1) on the basis of reading a lot of literatures, the deformation analysis and control theory of foundation pit during excavation are summarized. (2) through the analysis of the deformation monitoring data of the ground wall during the excavation of the foundation pit in the actual project, the horizontal displacement of the top of the wall is beyond the range of the alarm value, to a large extent, because the position of the first horizontal support is too low. The cantilever length of the wall is too large, resulting in a large horizontal displacement. At the same time, by studying the measured data of horizontal brace, the internal force variation rule of the bracing system is obtained. (3) the finite element software ABAQUS is used to simulate the actual engineering, and the deformation law of the foundation pit is obtained by analyzing the simulation results. (4) comparing the deformation law of the measured data and the simulated deformation law, there are some differences between the two data, but the whole deformation law is similar. Although there is a certain deviation between the calculation results obtained by the finite element method and the actual engineering, the results obtained by the simulation can provide some theoretical guidance for the design and construction of the actual foundation pit excavation engineering, and the simulation results can provide some theoretical guidance for the design and construction of the actual foundation pit excavation engineering. The actual monitoring results will also provide the actual data for the further optimization and perfection of the finite element software simulation.
【学位授予单位】：天津城建大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753;TU473.2
本文编号：2462291
[Abstract]:With the development of modernization in China, the construction of a large number of urban high-rise, super-high-rise buildings and the utilization of urban underground space have led to the emergence of a large number of deep foundation pit projects, especially in Tianjin, due to its immediate proximity to the Bohai Bay. Therefore, the underground soft soil layer is thick and widely distributed. In the center of the city, there is a great risk to the excavation of the super-deep foundation pit in the complicated area of the surrounding environment. Therefore, it is of great engineering significance to study the deformation of super-deep foundation pit in soft soil area. In this paper, based on a project in the dense area of buildings in downtown Tianjin, finite element software ABAQUS is used to simulate and analyze the excavation process of the foundation pit. The concrete work of this paper is as follows: (1) on the basis of reading a lot of literatures, the deformation analysis and control theory of foundation pit during excavation are summarized. (2) through the analysis of the deformation monitoring data of the ground wall during the excavation of the foundation pit in the actual project, the horizontal displacement of the top of the wall is beyond the range of the alarm value, to a large extent, because the position of the first horizontal support is too low. The cantilever length of the wall is too large, resulting in a large horizontal displacement. At the same time, by studying the measured data of horizontal brace, the internal force variation rule of the bracing system is obtained. (3) the finite element software ABAQUS is used to simulate the actual engineering, and the deformation law of the foundation pit is obtained by analyzing the simulation results. (4) comparing the deformation law of the measured data and the simulated deformation law, there are some differences between the two data, but the whole deformation law is similar. Although there is a certain deviation between the calculation results obtained by the finite element method and the actual engineering, the results obtained by the simulation can provide some theoretical guidance for the design and construction of the actual foundation pit excavation engineering, and the simulation results can provide some theoretical guidance for the design and construction of the actual foundation pit excavation engineering. The actual monitoring results will also provide the actual data for the further optimization and perfection of the finite element software simulation.
【学位授予单位】：天津城建大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753;TU473.2
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