本文選題：盾構(gòu)隧道　切入點：管片　出處：《武漢理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：伴隨著我國經(jīng)濟的高速發(fā)展，隧道工程在全國得到大規(guī)模的開發(fā)，越來越多的大型隧道工程開工建設(shè)，由于其施工工藝的優(yōu)勢，盾構(gòu)隧道掘進的同時進行出渣操作，襯砌在盾構(gòu)機內(nèi)拼裝完成，隨后實施壁后注漿操作，盾構(gòu)隧道技術(shù)對周圍土體的擾動小，對地層的沉降影響低，盾構(gòu)法越來越受到設(shè)計者的青睞，越來越多的隧道工程采用盾構(gòu)法施工。而管片，在盾構(gòu)設(shè)計施工中至關(guān)重要，管片盾構(gòu)隧道中起到支護和防護的作用，需要承擔(dān)土壓力、水壓力以及各種特殊壓力，其設(shè)計關(guān)乎到建筑成本和建筑安全。對管片的理論分析和優(yōu)化設(shè)計具有實際意義。而本文結(jié)合南京緯三路過江隧道工程，通過理論分析和數(shù)值模擬，對管片的受力進行研究，并且結(jié)合神經(jīng)網(wǎng)絡(luò)和遺傳算法，對管片的設(shè)計進行了優(yōu)化分析。主要內(nèi)容如下： （1）管片結(jié)構(gòu)設(shè)計 論述了管片結(jié)構(gòu)設(shè)計的相關(guān)理論基礎(chǔ)，闡明了盾構(gòu)隧道管片間的接頭單元理論，詳細描述了管片設(shè)計所受到的相關(guān)荷載，并且介紹了管片設(shè)計中的計算方法，確定了研究管片的建模方式。通過對管片所在地形的分析和了解，，依據(jù)實際情況，計算了管片受到的相應(yīng)荷載。 （2）討論管片優(yōu)化相關(guān)因素 基于有限元軟件，對管片進行了理論分析，在相同荷載及相同管片幾何條件下，探討了慣用計算法和梁-彈簧模型的差別。同時通過控制變量法，對管片的單一屬性，如管片長，管片寬，管片厚度等進行逐一分析，得到影響管片設(shè)計的相關(guān)因素。 （3）建立結(jié)構(gòu)優(yōu)化設(shè)計方案 通過正交試驗，利用遺傳算法并且結(jié)合神經(jīng)網(wǎng)絡(luò)對結(jié)構(gòu)設(shè)計進行設(shè)計優(yōu)化。選取盾構(gòu)隧道管片的幾個較為明顯的影響因素，管片數(shù)量，管片寬度，管片厚度，管片接頭剛度，管片接頭剛度，將其作為控制變量，將管片隧道的相對位移值作為控制條件，進行設(shè)計優(yōu)化。利用有限元軟件對管片的內(nèi)力進行模擬計算分析，得到相應(yīng)狀況下的管片受力分析。 （4）論證 將計算結(jié)果與原始設(shè)計對比，驗證優(yōu)化設(shè)計的正確性。討論得到相關(guān)經(jīng)驗。
[Abstract]:With the rapid economic development of our country, the tunnel project has been developed on a large scale throughout the country, and more and more large-scale tunnel projects have been started. Because of the advantages of its construction technology, the shield tunneling is carried out at the same time. The lining is assembled in the shield machine, and then the backwall grouting operation is carried out. The shield tunnel technology has little disturbance to the surrounding soil and low influence on the ground settlement, so the shield method is more and more favored by the designers. More and more tunnel projects are constructed by shield method, and the segment is very important in shield design and construction. The shield tunnel plays a supporting and protective role in the segment shield tunnel, which needs to bear the earth pressure, water pressure and various special pressures. Its design is related to building cost and building safety. It has practical significance for theoretical analysis and optimization design of segments. In this paper, through theoretical analysis and numerical simulation, the stress of segments is studied in combination with the Nanjing Weijiang-crossing tunnel project. Combined with neural network and genetic algorithm, the design of segment is optimized and analyzed. The main contents are as follows:. Design of segment structure. This paper discusses the relevant theoretical basis of segment structure design, expounds the theory of joint element between segments of shield tunnel, describes in detail the relevant loads on segment design, and introduces the calculation method in segment design. Based on the analysis and understanding of the local shape of the segment, the corresponding load on the segment is calculated according to the actual situation. Discuss the relevant factors of segment optimization. Based on the finite element software, the theoretical analysis of the segment is carried out. Under the same load and the same segment geometry, the difference between the usual calculation method and the beam-spring model is discussed. At the same time, the single property of the segment is obtained by controlling the variable method. For example, the length, width and thickness of the segment are analyzed one by one, and the relevant factors affecting the design of the segment are obtained. To establish the optimal design scheme of the structure. Through orthogonal experiment, the structural design is optimized by genetic algorithm and neural network. The number of segments, the width of segment, the thickness of segment, the stiffness of segment joint are selected to influence the segment number of shield tunnel, the number of segments, the width of segment, the thickness of segment and the stiffness of segment joint. The stiffness of segment joint is taken as the control variable and the relative displacement of segment tunnel is taken as the control condition to optimize the design. The internal force of segment is simulated and analyzed by finite element software. The stress analysis of the segment in the corresponding condition is obtained. 4) argumentation. The results are compared with the original design to verify the correctness of the optimal design.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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