本文選題：盾構(gòu)　切入點：下穿　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：隨著城市軌道交通網(wǎng)絡(luò)不斷擴(kuò)大,地上地下空間的利用率逐漸趨于飽和。一些新建地鐵線路和市政管線不可避免與既有線路產(chǎn)生交叉,尤其盾構(gòu)隧道近距離穿越既有地鐵盾構(gòu)區(qū)間的工程更是不可避免,其施工難度大、要求高。因此需要系統(tǒng)化研究盾構(gòu)下穿盾構(gòu)工程引起的既有地鐵結(jié)構(gòu)變形規(guī)律和軌道動力響應(yīng),從而優(yōu)化施工控制措施,以保障施工過程中既有地鐵的安全運營,這方面的研究對地鐵和城市地下工程的發(fā)展有著重要的指導(dǎo)意義。 本文在查閱大量文獻(xiàn)基礎(chǔ)上,以某盾構(gòu)隧道近距離下穿北京地鐵雙線盾構(gòu)區(qū)間工程實例為研究對象,該工程中盾構(gòu)隧道距離既有地鐵盾構(gòu)區(qū)間豎向凈距為6m(1.0D),既有地鐵處于盾構(gòu)強(qiáng)烈影響區(qū),且本工程具有地層條件復(fù)雜多變性,工程影響不確定性等特點,但穿越過程中既有地鐵結(jié)構(gòu)最大沉降僅為0.98mmm,這是北京地區(qū)首次盾構(gòu)成功穿越既有地鐵盾構(gòu)區(qū)間的典型工程。 主要研究內(nèi)容如下： (1)運用ANSYS有限元軟件,基于連續(xù)介質(zhì)理論,建立地層—結(jié)構(gòu)三維實體模型,模擬分析盾構(gòu)下穿施工對既有地鐵盾構(gòu)區(qū)間造成的影響。 (2)結(jié)合具體實際施工情況,通過重點分析施工過程中的實測數(shù)據(jù),并將實測數(shù)據(jù)與模擬計算結(jié)果進(jìn)行對比,驗證模擬計算的準(zhǔn)確性,總結(jié)盾構(gòu)施工中的同步注漿及二次注漿等措施對既有地鐵區(qū)間的影響規(guī)律。 (3)基于本工程的成功穿越,結(jié)合數(shù)值預(yù)測和監(jiān)測數(shù)據(jù)分析,并參照案例工程的管理流程,初步研究盾構(gòu)下穿既有盾構(gòu)工程的風(fēng)險管理流程；分析歸納盾構(gòu)下穿地鐵工程的主動處理措施和被動處理措施,進(jìn)而形成一套盾構(gòu)穿越既有盾構(gòu)工程的風(fēng)險控制流程,保障穿越工程的順利進(jìn)行。 (4)采用ABAQUS有限元軟件,建立車輛—軌道—隧道三維耦合動力分析模型,基于靜力分析的計算結(jié)果,分析盾構(gòu)施工產(chǎn)生的軌道結(jié)構(gòu)變形對車輛行走性能和軌道動力特性的影響,為保障既有線路的安全運營提供合理建議。
[Abstract]:Absrtact: with the continuous expansion of urban rail transit network, the utilization ratio of ground and underground space tends to saturate gradually. Some newly built subway lines and municipal pipelines inevitably cross with existing lines. Especially, the project of shield tunnel passing through the shield section of existing subway is inevitable, and its construction is very difficult. Therefore, it is necessary to systematically study the deformation law and track dynamic response of existing subway structures caused by shield tunneling engineering, so as to optimize construction control measures to ensure the safe operation of existing subway during construction. The research in this field is of great significance to the development of subway and urban underground engineering. On the basis of consulting a large number of documents, this paper takes the example of a shield tunnel passing through the double-line shield section of Beijing Metro at close range as the research object. In this project, the vertical net distance between shield tunnel and metro shield section is 6 m ~ (1.0) D ~ (-1), and the subway is in the strong influence area of shield tunneling, and the project is characterized by complex and variable formation conditions and uncertainty of engineering influence, etc. However, the maximum settlement of the existing subway structure is only 0.98 mm m in the course of crossing, which is the first typical project of shield tunneling in Beijing through the existing subway shield section successfully. The main contents of the study are as follows:. 1) using ANSYS finite element software and based on continuum medium theory, a three-dimensional solid model of stratigraphic structure is established, and the influence of tunneling construction under shield tunneling on the existing shield section of metro is simulated and analyzed. 2) combining with the actual construction situation, the accuracy of the simulation calculation is verified by analyzing the measured data in the construction process and comparing the measured data with the simulated calculation results. The effects of synchronous grouting and secondary grouting on the existing metro sections are summarized. 3) based on the successful traversing of the project, combined with numerical prediction and monitoring data analysis, and referring to the management process of the case engineering, the risk management process of the existing shield engineering under shield tunneling is preliminarily studied. This paper analyzes and summarizes the active and passive treatment measures of subway project under shield tunneling, and then forms a set of risk control flow of shield tunneling through existing shield engineering to ensure the smooth progress of the crossing project. In this paper, the three-dimensional coupling dynamic analysis model of vehicle-track-tunnel is established by using ABAQUS finite element software. Based on the calculation results of static analysis, the influence of track structure deformation caused by shield tunneling on vehicle walking performance and track dynamic characteristics is analyzed. Reasonable suggestions are provided to ensure the safe operation of the existing lines.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43;U231

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 李京爽,王哲;地鐵盾構(gòu)管片彎曲變形特性試驗研究[J];北方交通大學(xué)學(xué)報;2004年01期

2 侯學(xué)淵,廖少明;盾構(gòu)隧道沉降預(yù)估[J];地下工程與隧道;1993年04期

3 張明聚;劉曉娟;杜永驍;;復(fù)合地層中盾構(gòu)施工對鄰近建筑物群的影響分析[J];北京工業(yè)大學(xué)學(xué)報;2013年02期

4 徐會杰;彭華;徐希磊;劉寒遷;;盾構(gòu)下穿城際客運專線引起變形的數(shù)值分析[J];都市快軌交通;2013年06期

5 呂璽琳;王浩然;;軟土盾構(gòu)隧道開挖面支護(hù)壓力極限上限解[J];土木建筑與環(huán)境工程;2011年02期

6 鄧美龍;黃常波;李鐘;郝本峰;王東猛;;盾構(gòu)穿越鐵路安全施工技術(shù)[J];建筑技術(shù);2009年11期

，

本文編號：1646760