發(fā)布時(shí)間：2018-02-09 05:18

  本文關(guān)鍵詞： 地鐵隧道 穿越樁基 異形板橋 易損性指數(shù) 風(fēng)險(xiǎn)評估 雷達(dá)圖法 剩余承載力 基礎(chǔ)沉降控制 頂升量控制 關(guān)鍵頂升參數(shù)　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國地下空間的開發(fā)與利用,城市地鐵工程的建設(shè)正迎來新一輪高潮。考慮到城市建設(shè)的復(fù)雜性,地鐵隧道穿越城市橋梁基礎(chǔ)是不可避免的。作為城市橋梁系統(tǒng)中最為薄弱的部位,異形板橋的安全必須引起工程技術(shù)人員足夠的重視。本文依托北京地鐵7號線穿越廣安門異形板橋工程,通過工前風(fēng)險(xiǎn)評估、異形板橋剩余承載力評定、異形板橋基礎(chǔ)沉降控制標(biāo)準(zhǔn)的確定和主動頂升支護(hù)關(guān)鍵參數(shù)的優(yōu)化等環(huán)節(jié),實(shí)現(xiàn)盾構(gòu)隧道穿越城市異形板橋工程的安全控制。本文提出的關(guān)于穿越工程風(fēng)險(xiǎn)定級和主動支護(hù)關(guān)鍵參數(shù)設(shè)計(jì)的方法在實(shí)際工程中得到了驗(yàn)證,可為今后隧道穿越異形板橋工程的風(fēng)險(xiǎn)評估和頂升支護(hù)設(shè)計(jì)提供參考。本文主要內(nèi)容包括:(1)從盾構(gòu)隧道施工對周圍土層擾動的機(jī)理出發(fā),研究了盾構(gòu)隧道施工對單樁及群樁基礎(chǔ)的影響,重點(diǎn)分析了群樁基礎(chǔ)的遮攔效應(yīng)和土拱效應(yīng),并使用FLAC3D軟件對盾構(gòu)隧道施工影響下鄰近群樁的基礎(chǔ)變形進(jìn)行了數(shù)值模擬分析。(2)通過引入單向受壓彈簧模擬橡膠支座的作用,對城市異形板橋的結(jié)構(gòu)特點(diǎn)和沉降力學(xué)特性進(jìn)行了有限元分析。引入易損性指數(shù),實(shí)現(xiàn)了對異形板橋基礎(chǔ)沉降易損性的評價(jià)。(3)在分析盾構(gòu)施工對地層和樁基影響的基礎(chǔ)上,引入了改進(jìn)肯特法風(fēng)險(xiǎn)評估模型。通過結(jié)合工程實(shí)際狀況并優(yōu)化相關(guān)參數(shù)和評價(jià)指標(biāo),使用FLAC3D和Midas Civil進(jìn)行數(shù)值模擬,從而實(shí)現(xiàn)了盾構(gòu)隧道穿越廣安門異形板工程的風(fēng)險(xiǎn)定級。(4)在分析廣安門異形板橋力學(xué)特性的基礎(chǔ)上,通過引入雷達(dá)圖法實(shí)現(xiàn)了對異形板橋剩余承載力的評估。借助Midas Civil進(jìn)行異形板橋的基礎(chǔ)沉降特性分析,確定了廣安門異形板橋單墩沉降控制標(biāo)準(zhǔn),并在此基礎(chǔ)上得到不同基礎(chǔ)組合沉降的控制方法。(5)通過對異形板橋主動頂升過程中各種工況的有限元模擬,并借助前期對異形板橋承載力的折減分析,得到了廣安門異形板橋頂升過程中各墩柱的頂升控制限值,進(jìn)而實(shí)現(xiàn)了各墩位不同頂升量的組合頂升控制。(6)在使用有限元分析的基礎(chǔ)上,通過對不同頂升工況下異形板內(nèi)力響應(yīng)結(jié)果的對比,得出了異形板橋頂升過程中的關(guān)鍵參數(shù)的最優(yōu)取值,優(yōu)化了異形板橋的主動頂升過程中的關(guān)鍵參數(shù)。
[Abstract]:With the development and utilization of underground space in China, the construction of urban subway project is facing a new wave of climax. Considering the complexity of urban construction, It is inevitable for subway tunnels to pass through the foundation of urban bridges. As the weakest part of the urban bridge system, The safety of special-shaped slab bridge must be paid enough attention by engineers and technicians. This paper relies on Beijing Metro Line 7 to pass through the Guang'anmen special-shaped slab bridge project. Through pre-construction risk assessment, the residual bearing capacity of special-shaped slab bridge is evaluated. The determination of settlement control standard for foundation of special-shaped slab bridge and the optimization of key parameters of active jacking support, The safety control of shield tunneling through urban special-shaped slab bridge is realized. The method of risk classification and design of key parameters of active support proposed in this paper has been verified in practical engineering. It can be used as a reference for risk assessment and jacking support design of tunnel crossing through special-shaped slab bridge in the future. The main contents of this paper include: 1) starting from the mechanism of shield tunnel construction disturbing the surrounding soil layer, The influence of shield tunnel construction on single pile and pile group foundation is studied, and the blocking effect and soil arch effect of pile group foundation are analyzed. The foundation deformation of adjacent piles under the influence of shield tunnel construction is simulated by using FLAC3D software. The structural characteristics and settlement mechanics characteristics of special shaped slab bridges in cities are analyzed by finite element method. The vulnerability index is introduced to evaluate the foundation settlement vulnerability of special-shaped slab bridges. On the basis of analyzing the influence of shield construction on stratum and pile foundation, An improved Kent method risk assessment model is introduced. By combining the actual engineering conditions and optimizing the relevant parameters and evaluation indexes, the FLAC3D and Midas Civil are used to carry out the numerical simulation. Thus, the risk grading of shield tunnel passing through Guang'anmen special-shaped plate engineering is realized. On the basis of analyzing the mechanical characteristics of Guang'anmen special-shaped slab bridge, the paper analyzes the mechanical characteristics of Guang'anmen special-shaped slab bridge. The residual bearing capacity of special-shaped slab bridge is evaluated by introducing the radar chart method. With the aid of Midas Civil, the foundation settlement characteristic of special-shaped slab bridge is analyzed, and the settlement control standard of single pier of Guang'anmen special-shaped slab bridge is determined. On this basis, the control method of composite settlement of different foundation is obtained. The finite element simulation of various conditions in the active lifting process of special-shaped slab bridge is carried out, and the reduction analysis of bearing capacity of special-shaped slab bridge is carried out in the early stage. The lifting control limit value of each pier column in the lifting process of Guang'anmen special-shaped slab bridge is obtained, and then the combined uplift control of various piers with different lifting amounts is realized. On the basis of finite element analysis, the finite element analysis is used. By comparing the results of internal force response of special-shaped plate under different lifting conditions, the optimal value of key parameters in the uplift process of special-shaped slab bridge is obtained, and the key parameters in active lifting process of special-shaped slab bridge are optimized.
【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】：2017
【分類號】：U455;U443.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 盧春林;;淺埋暗挖隧道穿越既有橋梁風(fēng)險(xiǎn)評估方法研究[J];鐵道科學(xué)與工程學(xué)報(bào);2016年06期

2 王丹丹;王巍巍;陳秋華;詹燕紅;;以肯特法為基礎(chǔ)的海底管道風(fēng)險(xiǎn)評估方法研究與應(yīng)用[J];石油工程建設(shè);2015年04期

3 王佳妮;牛曉凱;薛忠軍;蘇潔;;地鐵穿越橋梁主動頂升監(jiān)測系統(tǒng)研究[J];科學(xué)技術(shù)與工程;2013年26期

4 李農(nóng)發(fā);趙義飛;;靜力水準(zhǔn)測量系統(tǒng)在向家壩水電站的應(yīng)用[J];大地測量與地球動力學(xué);2013年S1期

5 陳潔金;陽軍生;張永杰;張學(xué)民;;下穿建筑物隧道施工風(fēng)險(xiǎn)評估方法[J];鐵道科學(xué)與工程學(xué)報(bào);2013年04期

6 鄭余朝;李輝;;ANP-FE與數(shù)值模擬結(jié)合在地鐵隧道近接施工風(fēng)險(xiǎn)評估與管理中的應(yīng)用[J];現(xiàn)代隧道技術(shù);2013年03期

7 閆保華;曹煒;盧士軍;王克家;楊輝;劉海軍;申強(qiáng);;橋梁頂升技術(shù)在地鐵近距離下穿橋梁中的應(yīng)用[J];施工技術(shù);2012年23期

8 邵翔宇;;地鐵隧道穿越市政橋梁動態(tài)主動保護(hù)施工技術(shù)[J];建筑技術(shù);2012年10期

9 呂毅剛;張建仁;彭暉;張克波;;基于雷達(dá)圖的既有鋼筋混凝土拱肋承載力評定[J];公路交通科技;2011年07期

10 陳廣亮;;復(fù)合錨桿樁在隧道下穿橋樁加固土體中的應(yīng)用[J];山西建筑;2011年07期

相關(guān)會議論文 前1條

1 潘可明;陳立;;北京市地鐵工程穿越城市橋梁安全保護(hù)研究[A];第十八屆全國橋梁學(xué)術(shù)會議論文集（上冊）[C];2008年

相關(guān)博士學(xué)位論文 前2條

1 蘇潔;淺埋暗挖法隧道施工對鄰近樁基的影響及其控制[D];北京交通大學(xué);2009年

2 關(guān)繼發(fā);新建地鐵隧道穿越既有地鐵安全風(fēng)險(xiǎn)及其控制技術(shù)的研究[D];西安建筑科技大學(xué);2008年

相關(guān)碩士學(xué)位論文 前2條

1 趙江濤;城市暗挖隧道穿越既有橋梁的安全控制[D];北京交通大學(xué);2015年

2 姜智平;地鐵隧道開挖引起地層沉降的經(jīng)驗(yàn)理論法預(yù)測及鄰近立交橋上部異形板構(gòu)件抗沉降特征分析[D];北京交通大學(xué);2007年

，

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