【摘要】：地鐵在迅猛發(fā)展的同時(shí)也日益暴露出很多問題,隨之逐漸開始了針對(duì)地鐵結(jié)構(gòu)耐久性問題的研究。本文以973國(guó)家重點(diǎn)基礎(chǔ)研究計(jì)劃項(xiàng)目(2011CB013802)課題二“地下結(jié)構(gòu)性能與環(huán)境耦合作用機(jī)制”為依托,針對(duì)帶裂縫盾構(gòu)隧道管片混凝土結(jié)構(gòu)在氯離子侵蝕和荷載耦合作用下的耐久性能展開相關(guān)研究。主要研究?jī)?nèi)容如下： (1)基于已完成的氯離子侵蝕和荷載耦合作用下管片性能試驗(yàn)(人工環(huán)境試驗(yàn))數(shù)據(jù)總結(jié)提煉出了管片混凝土結(jié)構(gòu)在氯離子侵蝕下的表面氯離子濃度、擴(kuò)散系數(shù)等參數(shù)的時(shí)變表達(dá)式； (2)結(jié)合所得相關(guān)參數(shù),基于Comsol Multiphysics軟件建立氯離子侵蝕管片混凝土模型,以侵蝕時(shí)間、氯鹽侵蝕溶液濃度為試驗(yàn)因子進(jìn)行氯離子侵蝕機(jī)制數(shù)值模擬研究,探討了侵蝕時(shí)間及氯鹽侵蝕溶液濃度對(duì)氯離子在混凝土內(nèi)部擴(kuò)散的影響,并將數(shù)值模擬結(jié)果與人工環(huán)境試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析； (3)對(duì)混凝土裂縫的成因及表征參數(shù)進(jìn)行分析,進(jìn)而建立考慮裂縫的氯離子侵蝕機(jī)制數(shù)值模擬模型,以裂縫寬度及深度作為試驗(yàn)因子探討裂縫對(duì)氯離子侵蝕的影響,進(jìn)一步分析裂縫的影響范圍及其對(duì)氯離子侵蝕的作用,并建立了考慮裂縫的氯離子侵蝕模型； (4)通過理論分析,確定管片結(jié)構(gòu)的荷載裂縫計(jì)算表達(dá)式,結(jié)合考慮裂縫的氯離子侵蝕模型建立耦合裂縫、侵蝕環(huán)境、荷載作用下管片耐久性能評(píng)價(jià)模型。圖44副,表34個(gè),參考文獻(xiàn)94篇。
[Abstract]:With the rapid development of subway, many problems have been exposed day by day. This paper is based on the "Coupling Mechanism of Underground structure performance and Environment", Project II of the 973 National key basic Research Program (2011CB013802). The durability of the segmented concrete structure of shield tunnel with cracks under the action of chloride ion erosion and load coupling is studied in this paper. The main research contents are as follows: (1) based on the experimental data of segment performance under chloride ion erosion and load coupling (artificial environment test), segment concrete structure is extracted under chloride ion erosion. The concentration of chlorine ions on the surface, The time-varying expression of diffusion coefficient and other parameters. (2) based on Comsol Multiphysics software, the model of chloride ion erosion segment concrete is established. The mechanism of chloride ion erosion was numerically simulated by chloride solution concentration as experimental factor. The effects of erosion time and chloride solution concentration on chloride ion diffusion in concrete were discussed. The numerical simulation results are compared with the results of artificial environment test. (3) the causes and characterization parameters of concrete cracks are analyzed, and the numerical simulation model of chloride erosion mechanism considering cracks is established. The influence of crack width and depth on chloride ion erosion is discussed, the influence range of crack and its effect on chloride ion erosion are analyzed, and a chloride erosion model considering crack is established. (4) through theoretical analysis, the calculation expression of load crack of segment structure is determined. Combined with chloride ion erosion model considering crack, the coupled crack, erosion environment and durability evaluation model of segment under load are established. 44 pairs of figs, 34 tables and 94 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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本文編號(hào)：2245147