本文關(guān)鍵詞： 有限元分析 基坑開(kāi)挖 管線變形 影響因素 空間效應(yīng) 被動(dòng)區(qū)加固　出處：《天津城建大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展，由于城市人口眾多，建筑物密集，各類(lèi)地下管線錯(cuò)綜復(fù)雜，城市建設(shè)基坑開(kāi)挖不斷加深加大，深基坑開(kāi)挖的安全問(wèn)題和對(duì)周邊環(huán)境的影響成了巖土工程研究的一個(gè)重要的課題。本文在前人研究的基礎(chǔ)上，運(yùn)用有限元軟件ABAQUS就深基坑開(kāi)挖對(duì)周?chē)叵鹿芫�的影響這一課題進(jìn)行了研究分析。主要內(nèi)容和結(jié)論如下： 1.首先介紹了ABAQUS有限元軟件在基坑開(kāi)挖中的應(yīng)用，對(duì)三維有限元中單元類(lèi)型、本構(gòu)模型的選取，初始應(yīng)力的設(shè)置以及開(kāi)挖步驟等關(guān)鍵技術(shù)分別進(jìn)行了闡述。 2.本文主要通過(guò)采用ABAQUS軟件建立土體、圍護(hù)結(jié)構(gòu)及其鄰近地埋管線為一體的3D有限元模型。研究分析了分步開(kāi)挖、不同管材、距離基坑遠(yuǎn)近、不同埋置深度以及周邊堆載等不同因素對(duì)地下管線變形的影響，通過(guò)對(duì)數(shù)值模擬結(jié)果進(jìn)行對(duì)比分析，得出管線的變形隨著開(kāi)挖深度的增加而增加；管線的變形與其彈性模量的大小有關(guān)；基坑對(duì)鄰近管線的影響范圍大致在3倍的開(kāi)挖深度；基坑施工過(guò)程中盡量減少在基坑周邊土體堆載，，控制基坑開(kāi)挖變形對(duì)周邊環(huán)境的影響，減少事故的發(fā)生。 3.結(jié)合工程實(shí)例，運(yùn)用ABAQUS建立了內(nèi)撐式支護(hù)結(jié)構(gòu)基坑開(kāi)挖的三維有限元模型，通過(guò)把模擬結(jié)果和具體監(jiān)測(cè)數(shù)據(jù)對(duì)照，驗(yàn)證了模型有一定的準(zhǔn)確性。對(duì)基坑開(kāi)挖的空間效應(yīng)對(duì)鄰近地下管線的位移影響，得出管線的變形受開(kāi)挖順序和基坑端部坑角效應(yīng)的影響明顯，管線在基坑坑角部位受其影響的范圍在1.5倍的開(kāi)挖深度內(nèi)。并對(duì)基坑被動(dòng)區(qū)加固的合理范圍進(jìn)行了對(duì)比分析，采用被動(dòng)區(qū)土體加固可以有效的減小其對(duì)周?chē)芈窆芫�的位移，結(jié)合本工程實(shí)際情況，認(rèn)為加固深度為6m寬度為7m時(shí)是能滿(mǎn)足加固效果前提下最經(jīng)濟(jì)的范圍。 通過(guò)本文的初步研究，大型基坑開(kāi)挖對(duì)周?chē)叵鹿芫�的影響取得了初步認(rèn)識(shí)，為以后信息化施工指導(dǎo)工程實(shí)踐提供了一定的理論基礎(chǔ)，對(duì)于實(shí)際基坑工程中對(duì)周?chē)叵鹿芫�的保護(hù)設(shè)計(jì)及今后的研究都有一定的參考意義。
[Abstract]:With the development of economy, because of the large population, dense buildings and complicated underground pipelines, the excavation of foundation pit in urban construction is deepening and increasing. The safety of deep foundation pit excavation and its influence on the surrounding environment have become an important subject in geotechnical engineering. The influence of deep foundation pit excavation on underground pipeline is studied and analyzed by using finite element software ABAQUS. The main contents and conclusions are as follows:. 1. The application of ABAQUS finite element software in excavation of foundation pit is introduced. The key techniques such as element type, selection of constitutive model, setting of initial stress and excavation steps in 3D finite element are described respectively. 2. The 3D finite element model of soil mass, retaining structure and its adjacent buried pipe line is established by using ABAQUS software. The paper studies and analyzes the step by step excavation, different pipe materials, and the distance from the foundation pit. Through the comparison and analysis of the numerical simulation results, it is concluded that the pipeline deformation increases with the increase of excavation depth. The deformation of pipeline is related to its elastic modulus; the influence of foundation pit on the adjacent pipeline is about 3 times the depth of excavation; during the construction of foundation pit, the heaped load of soil around the foundation pit is reduced as far as possible. Control the influence of excavation deformation on the surrounding environment and reduce the occurrence of accidents. 3. Combined with the engineering example, the three-dimensional finite element model of the excavation of the foundation pit of the braced retaining structure is established by using ABAQUS. The simulation results are compared with the specific monitoring data. The accuracy of the model is verified. The displacement of the adjacent underground pipeline is affected by the spatial effect of excavation, and the deformation of the pipeline is obviously affected by the excavation sequence and the pit angle effect at the end of the foundation pit. The influence range of pipeline on pit corner is 1.5 times of excavation depth. The reasonable range of reinforcement in passive zone of foundation pit is compared and analyzed. The displacement of pipeline buried in surrounding area can be effectively reduced by soil reinforcement in passive zone. Combined with the actual situation of the project, it is considered that the most economical range under the premise of the reinforcement effect can be obtained when the depth of reinforcement is 6m and the width is 7m. Through the preliminary research in this paper, the influence of large excavation on the underground pipeline around the foundation pit has been preliminarily understood, which provides a certain theoretical basis for guiding the engineering practice of the information construction in the future. It has certain reference significance for the protection design and future research of underground pipeline in actual foundation pit engineering.
【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(lèi)號(hào)】：TU753;TU990.3

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