【摘要】：深基坑工程是一個綜合性很強(qiáng)的巖土工程問題,在其開挖支護(hù)的過程中既要保證基坑正常安全作業(yè),又要防止支護(hù)結(jié)構(gòu)及坑外土體位移過大,保證基坑周圍建筑物、道路、市政管線等不被破壞。對深基坑工程支護(hù)方案的設(shè)計優(yōu)化是保證基坑工程施工開挖順利進(jìn)行的重要手段。同時,隨著我國計算機(jī)技術(shù)的不斷發(fā)展,BIM技術(shù)及數(shù)值模擬技術(shù)被應(yīng)用到深基坑工程中,并發(fā)揮了重要作用,解決了許多工程問題。本文以長沙賀龍城市生活廣場深基坑工程為研究背景,采用BIM軟件Revit、Navisworks以及深基坑設(shè)計分析軟件對該深基坑工程初始設(shè)計方案進(jìn)行優(yōu)化與驗算分析。最后利用Plaxis有限元軟件對優(yōu)化后的支護(hù)結(jié)構(gòu)體系進(jìn)行數(shù)值模擬分析。主要工作包括:(1)利用BIM建模軟件Revit對基坑支護(hù)結(jié)構(gòu)體系建模,然后用Navisworks對支護(hù)模型進(jìn)行碰撞檢查,檢查初始設(shè)計中存在的問題并初步對其進(jìn)行優(yōu)化。(2)用理正深基坑軟件對BIM優(yōu)化后的方案進(jìn)行深化設(shè)計,對優(yōu)化方案的支護(hù)結(jié)構(gòu)水平位移和周邊地面沉降進(jìn)行分析,然后驗證其整體穩(wěn)定性、抗傾覆穩(wěn)定性以及抗隆起穩(wěn)定性。(3)通過Plaxis2D分別對優(yōu)化方案與初始方案進(jìn)行分步開挖數(shù)值模擬,對基坑開挖過程中土體變形、支護(hù)樁樁身水平位移以及樁身彎矩情況進(jìn)行分析,探討了隨基坑開挖深度的不斷加深,圍護(hù)樁水平位移以及地表沉降的變化規(guī)律。(4)將初始方案與優(yōu)化方案數(shù)值模擬結(jié)果進(jìn)行對比,證明優(yōu)化方案的有效性。同時,對坡頂水平位移、沉降、深層水平位移監(jiān)測數(shù)據(jù)進(jìn)行分析,并與優(yōu)化方案的Plaxis2D數(shù)值模擬結(jié)果作對比分析,來驗證所優(yōu)化方案的可行性,來保證基坑施工開挖過程的安全性。本文的研究是BIM技術(shù)及數(shù)值模擬技術(shù)理論和實踐的結(jié)合,對深基坑工程的設(shè)計及施工具有十分重要的指導(dǎo)意義。
[Abstract]:Deep foundation pit engineering is a very comprehensive geotechnical engineering problem. In the process of excavation and support, it is necessary to ensure the normal and safe operation of foundation pit, and to prevent the support structure and soil displacement outside the pit from being too large, so as to ensure the buildings and roads around the foundation pit. Municipal pipelines and so on will not be damaged. The design optimization of support scheme for deep foundation pit engineering is an important means to ensure the smooth construction and excavation of foundation pit engineering. At the same time, with the continuous development of computer technology in China, BIM technology and numerical simulation technology have been applied to deep foundation pit engineering, and played an important role in solving many engineering problems. This paper takes the deep foundation pit project of He Long city life square in Changsha as the research background, using BIM software Revit,Navisworks and deep foundation pit design analysis software to optimize and check the initial design scheme of the deep foundation pit project. Finally, Plaxis finite element software is used to simulate and analyze the optimized support structure system. The main work includes: (1) using BIM modeling software Revit to model the foundation pit supporting structure system, and then using Navisworks to carry out collision inspection to the supporting model. Check the existing problems in the initial design and optimize it. (2) using the software of Lizheng deep foundation pit to deepen the design of the optimized scheme of BIM, and analyze the horizontal displacement of the supporting structure and the surrounding ground settlement of the optimized scheme. Then verify its overall stability, anti-overturning stability and anti-uplift stability. (3) numerical simulation of the optimization scheme and the initial scheme are carried out by Plaxis2D, and the deformation of soil in the excavation process of foundation pit is simulated. The horizontal displacement and bending moment of the supporting pile body are analyzed, and it is discussed that with the deepening of the excavation depth of the foundation pit, (4) comparing the results of numerical simulation between the initial scheme and the optimization scheme to prove the effectiveness of the optimization scheme. At the same time, the monitoring data of horizontal displacement, settlement and deep horizontal displacement of slope top are analyzed and compared with the results of Plaxis2D numerical simulation of the optimized scheme to verify the feasibility of the optimized scheme. To ensure the safety of foundation pit construction and excavation process. The research of this paper is a combination of BIM technology and numerical simulation technology, and it has a very important guiding significance for the design and construction of deep foundation pit engineering.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473;TU17

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