本文關(guān)鍵詞：大型水下盾構(gòu)隧道結(jié)構(gòu)設(shè)計(jì)關(guān)鍵問(wèn)題研究　出處：《西南交通大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 水下盾構(gòu)隧道 隧道結(jié)構(gòu)設(shè)計(jì) 整體化設(shè)計(jì)方法 荷載取值方法 結(jié)構(gòu)設(shè)計(jì)參數(shù) 結(jié)構(gòu)分析方法 現(xiàn)場(chǎng)試驗(yàn)

【摘要】：當(dāng)前,我國(guó)正處于大型水下隧道建設(shè)的快速發(fā)展期,在國(guó)家經(jīng)濟(jì)發(fā)展的需求下,大批的大型水下隧道工程正開(kāi)工建設(shè),其中大量采用了盾構(gòu)法修建。然而,在面臨水下復(fù)雜地質(zhì)環(huán)境、結(jié)構(gòu)大型化的挑戰(zhàn)時(shí),原有的盾構(gòu)隧道結(jié)構(gòu)設(shè)計(jì)經(jīng)驗(yàn)、理論、技術(shù)與方法都呈現(xiàn)出了一些問(wèn)題,如何完善大型水下盾構(gòu)隧道結(jié)構(gòu)設(shè)計(jì)方法,保障隧道結(jié)構(gòu)安全、經(jīng)濟(jì)、合理、耐久已然成為亟待解決的關(guān)鍵問(wèn)題。鑒于此,本文針對(duì)大型水下盾構(gòu)隧道結(jié)構(gòu)設(shè)計(jì)中存在的若干關(guān)鍵問(wèn)題開(kāi)展研究,具有重要工程價(jià)值。論文以作者主持設(shè)計(jì)的幾座典型的大型水下盾構(gòu)隧道——廣深港高速鐵路獅子洋隧道、南京長(zhǎng)江隧道、武漢長(zhǎng)江隧道、武漢三陽(yáng)路長(zhǎng)江隧道等為背景,結(jié)合國(guó)家高技術(shù)發(fā)展計(jì)劃(863計(jì)劃)課題——“大型跨江海隧道結(jié)構(gòu)力學(xué)特征及整體化設(shè)計(jì)方法研究”等國(guó)家重大課題開(kāi)展研究工作,緊緊圍繞大型水下盾構(gòu)隧道結(jié)構(gòu)設(shè)計(jì)的關(guān)鍵問(wèn)題,分別從整體化設(shè)計(jì)方法、荷載取值、結(jié)構(gòu)合理化設(shè)計(jì)參數(shù)以及結(jié)構(gòu)分析方法等多個(gè)方面開(kāi)展深入的研究,得到主要研究結(jié)論如下1、提出了水下盾構(gòu)隧道整體化設(shè)計(jì)的概念,建立了水下盾構(gòu)隧道整體化設(shè)計(jì)的基本架構(gòu),明確了水下盾構(gòu)隧道整體化設(shè)計(jì)的目標(biāo)與影響因素與設(shè)計(jì)思路,提出了采用層次分析法、模糊綜合評(píng)判法和專家綜合評(píng)估法等數(shù)學(xué)方法建立水下盾構(gòu)隧道整體化設(shè)計(jì)的評(píng)估理論和決策方法,采用線性規(guī)劃、非線性規(guī)劃、無(wú)約束優(yōu)化方法、蒙特卡羅法和人工神經(jīng)網(wǎng)絡(luò)法等尋求最優(yōu)設(shè)計(jì)方案的整體化設(shè)計(jì)構(gòu)思,并采用整體化設(shè)計(jì)方法對(duì)獅子洋隧道襯砌結(jié)構(gòu)設(shè)計(jì)方案進(jìn)行最優(yōu)化比選。2、從盾構(gòu)施工對(duì)圍巖的影響以及圍巖-結(jié)構(gòu)的相互作用兩方面考量水下盾構(gòu)隧道荷載的產(chǎn)生與作用效應(yīng),分析了泥水盾構(gòu)施工過(guò)程中泥水作用、流固耦合效應(yīng)、盾尾注漿及管片壁后注漿、圍巖-結(jié)構(gòu)的相互協(xié)調(diào)作用等“施工效應(yīng)”對(duì)于水下盾構(gòu)隧道荷載的影響。在此基礎(chǔ)上,提出了考慮泥水盾構(gòu)“施工效應(yīng)”的修正收斂-約束法。以廣深港高速鐵路獅子洋隧道為例,針對(duì)軟土、硬巖、軟硬不均地層開(kāi)展了水、土壓力荷載的現(xiàn)場(chǎng)實(shí)測(cè),證實(shí)了泥水盾構(gòu)施工效應(yīng)對(duì)于大斷面水下盾構(gòu)隧道施工期乃至最終受荷的重要影響,驗(yàn)證了修正收斂-約束法的適用性與可靠性,并對(duì)目前水下盾構(gòu)隧道常用的荷載計(jì)算方法提出了使用建議。3、從結(jié)構(gòu)受力性能、隧道防水及結(jié)構(gòu)可靠性、施工難易程度以工程造價(jià)與工期等方面綜合考量襯砌結(jié)構(gòu)性能,提出了適應(yīng)于河床沖淤變化及水位變化的非封閉內(nèi)襯型雙層襯砌。從管片制作、運(yùn)輸、安裝及受力特性等方面深入對(duì)比分析,給出了大型水下盾構(gòu)隧道管片襯砌結(jié)構(gòu)分塊方式、管片厚度以及管片幅寬的合理化取值參數(shù)。對(duì)不同螺栓連接形式、接縫防水類型對(duì)接頭受力特性和防水性能的影響進(jìn)行分析,并在此基礎(chǔ)上給出了大型水下盾構(gòu)隧道接頭連接方式以及接縫防水措施建議。4、針對(duì)大型水下盾構(gòu)法隧道結(jié)構(gòu)特點(diǎn)及荷載復(fù)雜環(huán)境的影響,建立了以考慮接頭剛度迭代算法的梁-彈簧模型為主,考慮管片開(kāi)裂影響的梁-彈簧模型以及考量幅寬影響的三維殼-彈簧模型為輔的,能夠綜合考量接頭剛度的非線性迭代取值、管片錯(cuò)縫拼裝效應(yīng)、裂縫影響以及幅寬影響的大型水下盾構(gòu)法隧道管片襯砌結(jié)構(gòu)橫向分析方法體系。提出了能夠準(zhǔn)確考慮管片環(huán)及接頭力學(xué)特征的三維多環(huán)軸向等效剛度模型,彌補(bǔ)了既有三維骨架模型建模單元數(shù)目巨大以及建模過(guò)程復(fù)雜的不足,為大型盾構(gòu)隧道管片襯砌縱向力學(xué)分析提供了實(shí)用方法。
[Abstract]:At present, China is in a period of rapid development of tunnel construction in large water, the need of national economic development, a large number of large water tunnel project is under construction, which uses a lot of shield construction. However, in the face of complex geological environment of large scale structure of the challenge, the experience of shield tunnel the structure of the original design theory, technology and method and presents some problems, how to improve the large underwater shield tunnel structure design method, ensure the tunnel structure safety, economy, reasonable, durability has become the key problems to be solved. In view of this, this paper focuses on the key problems of tunnel structure design in large water research has important engineering value. The paper by the author presided over the design of several typical large underwater shield tunnel - XRL Shiziyang Tunnel, Nanjing Yangtze River tunnel, Wuhan The Yangtze River tunnel, Wuhan Sanyang road Yangtze River Tunnel as the background, combined with the national high technology research and development program (863 Program) major project -- "large subaqueous tunnel structure mechanics characteristics and the overall design method of other countries to carry out research work, focus on the key problems of shield tunnel structure design for large scale underwater, respectively design method from the whole, load value, study a reasonable structure parameter design and structure analysis method, obtained the main findings are as follows: 1, put forward the concept of underwater shield tunnel integrated design, established the basic framework of the whole underwater shield tunnel design, clear water shield tunnel and target the overall design of the influence factors and design ideas, put forward by AHP, underwater establish fuzzy comprehensive evaluation method and expert evaluation method The overall design of the shield tunnel evaluation theory and decision making method, using linear programming, nonlinear programming, constrained optimization methods, the overall design for the optimal design of Monte Carlo method and artificial neural network method, and the overall design method of Shiziyang Tunnel lining structure design scheme optimization selection.2, from two in terms of shield construction impact on the surrounding rock and the surrounding rock structure interaction and consider the effect of load of shield tunnel under water, analyzes the effect of mud slurry shield construction process, the coupling effect, the shield tail grouting and grouting behind segment, influence on surrounding rock structure interaction such as "construction effect" for the load of shield tunnel under the water. On this basis, the proposed amendment to consider convergence of slurry shield construction effect "- constraint method. With the ERL lion Ocean tunnel as an example, aiming at the soft soil, hard rock, soft hard ground to carry out water, field test of earth pressure, confirmed the construction of slurry shield effect on the construction period of underwater shield tunnel with large cross section and is greatly influenced by load, verify the applicability and reliability of convergence confinement method, and the current commonly used underwater shield tunnel load calculation method is presented using the proposed.3, the structure stress performance, reliability of tunnel waterproof and structure, the difficulty of construction project cost and duration and comprehensive consideration of lining structure performance, put forward the non closed type double lining lining on riverbed erosion and water level change from the segment production, transportation, installation and the paper analyzes stress characteristics and so on, given the lining structure of shield tunnel segment large underwater block, and the width of the segment thickness of rational value For different parameters. The bolt joint, analyzed the impact characteristics and waterproof waterproofing type of the joint force, and based on the joint of the shield tunnel large underwater connection and proposed joint waterproofing measures of.4, aiming at the large underwater shield tunnel structure characteristics and the influence of load in complex environment, is established in order to consider the joint stiffness iterative beam spring model, considering the influence of segment cracking beam spring model and considering the width influence of 3D shell spring model can be supplemented, comprehensive consideration of the stiffness of the joint non linear iterative value segment staggered assembling effect, large water effects and the effects of the crack width shield tunnel lining structure transverse analysis system. Put forward to accurately consider the 3D polycyclic axial equivalent and mechanical characteristics of segment ring stiffness model, make up for The existing 3D skeleton model has large number of modeling units and complex modeling process, which provides a practical method for longitudinal mechanics analysis of segment lining of large shield tunnel.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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