【摘要】：隨著我國現(xiàn)代化建設(shè)的進(jìn)行，城市大量高層、超高層建筑的興建以及城市地下空間的利用，使得深基坑工程大量涌現(xiàn)，特別是天津地區(qū)，由于其緊鄰渤海灣，所以其地下軟土層較厚而且分布廣泛。 而對(duì)于在城市中心、周邊環(huán)境復(fù)雜的地段進(jìn)行的超深基坑開挖的工程，更加存在著巨大的風(fēng)險(xiǎn)。所以，對(duì)軟土地區(qū)超深基坑開挖過程中的基坑變形性研究具有重要的工程意義。本文以天津鬧市區(qū)建筑物密集區(qū)某工程為研究背景，采用有限元軟件ABAQUS對(duì)該工程的基坑開挖過程進(jìn)行有限元模擬分析。 本文的具體工作有： （1）在大量閱讀文獻(xiàn)的基礎(chǔ)上，，綜述了基坑開挖過程中的基坑變形分析以及控制理論。 （2）通過分析實(shí)際工程基坑開挖過程中地連墻變形監(jiān)測數(shù)據(jù)得出，地連墻頂部的水平位移超出報(bào)警值范圍，很大程度上因?yàn)榈谝坏浪街蔚募茉O(shè)位置太低，使得地連墻懸臂長度太大，造成水平位移偏大。同時(shí)通過對(duì)實(shí)測的水平支撐的數(shù)據(jù)研究，得出了支撐體系的內(nèi)力變化規(guī)律。 （3）采用有限元軟件ABAQUS對(duì)實(shí)際工程進(jìn)行模擬，通過分析模擬結(jié)果得出基坑的變形規(guī)律。 （4）對(duì)比實(shí)測數(shù)據(jù)的變形規(guī)律和模擬得出的變形規(guī)律，二者的變形數(shù)據(jù)有一定差異，但是整體變形規(guī)律相似。 通過有限元方法得出的計(jì)算結(jié)果雖然會(huì)與實(shí)際工程存在一定的偏差，但是通過模擬得出的結(jié)果還是可以為實(shí)際基坑開挖工程的設(shè)計(jì)與施工提供一定的理論指導(dǎo)，而實(shí)際的監(jiān)測結(jié)果也會(huì)對(duì)有限元軟件模擬的進(jìn)一步優(yōu)化和完善提供實(shí)際的數(shù)據(jù)。
[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.
【學(xué)位授予單位】：天津城建大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753;TU473.2

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