【摘要】：近年來(lái),以客運(yùn)專線為重點(diǎn)的全國(guó)鐵路網(wǎng)建設(shè)已經(jīng)全面展開(kāi)并得到了蓬勃發(fā)展,鐵路隧道建設(shè)數(shù)量和總長(zhǎng)度均位居世界第一。隧道建設(shè)規(guī)模的日益擴(kuò)大與隧道建設(shè)理論不完善的矛盾日益突出,以經(jīng)驗(yàn)設(shè)計(jì)方法為主導(dǎo)的隧道設(shè)計(jì)理論將迎來(lái)巨大的挑戰(zhàn)。本文重點(diǎn)關(guān)注隧道二次襯砌支護(hù)結(jié)構(gòu),通過(guò)理論分析、工程試驗(yàn)和數(shù)值計(jì)算相結(jié)合的技術(shù)手段對(duì)二次襯砌結(jié)構(gòu)力學(xué)特性展開(kāi)深入研究,對(duì)二次襯砌結(jié)構(gòu)設(shè)計(jì)方案的優(yōu)化提供借鑒。主要取得了以下研究成果： (1)從現(xiàn)象上分析二次襯砌結(jié)構(gòu)的承載特性�；贏BAQUS平臺(tái)建立實(shí)際工程的三維有限元模型,運(yùn)用擴(kuò)展有限元法(XFEM)對(duì)于二次襯砌裂縫進(jìn)行分析,指出二次襯砌裂縫分布規(guī)律、裂縫擴(kuò)展過(guò)程、裂縫外觀表現(xiàn)形式及發(fā)生機(jī)制。地層條件對(duì)于二次襯砌裂縫的分布和裂縫類型有著重要影響,隨著地層側(cè)壓力系數(shù)的不斷增大,先后在拱頂內(nèi)側(cè)產(chǎn)生縱向裂縫,結(jié)構(gòu)左右兩側(cè)外部產(chǎn)生環(huán)向裂縫和結(jié)構(gòu)底部外側(cè)產(chǎn)生環(huán)向裂縫。 (2)從機(jī)理上分析二次襯砌結(jié)構(gòu)的承載特性。采用數(shù)值模擬方法,引入混凝土塑性損傷本構(gòu)模型,分析得到二次襯砌結(jié)構(gòu)的承載特性。明確二次襯砌結(jié)構(gòu)的彈塑性典型破壞過(guò)程,拱腳是最易破壞區(qū)域,應(yīng)采取加固措施；對(duì)于鋼筋混凝土二次襯砌和素混凝土二次襯砌兩類結(jié)構(gòu)類型,得出其在不同地層條件下的破壞規(guī)律,總結(jié)了配筋對(duì)于增強(qiáng)二次襯砌力學(xué)性能所發(fā)揮的作用；通過(guò)數(shù)值解與解析解的比較,驗(yàn)證了數(shù)值分析的可靠性。 (3)依托貴廣高速鐵路賀街隧道實(shí)驗(yàn)段工程現(xiàn)場(chǎng)監(jiān)測(cè)實(shí)例,并結(jié)合二次襯砌受力工程案例統(tǒng)計(jì)分析,得到二次襯砌背后受力特點(diǎn)。指出二次襯砌最不利受力狀態(tài)出現(xiàn)在拆模時(shí),初支-二襯接觸壓力呈現(xiàn)出較大的分布離散性,而且二次襯砌所受荷載實(shí)際上是初支傳遞過(guò)來(lái)的形變壓力,與規(guī)范上采用松散體高度計(jì)算得到的松散壓力是不同的；拱頂接觸壓力較小。
[Abstract]:In recent years, the construction of national railway network, which focuses on passenger dedicated railway lines, has been carried out in an all-round way and has been vigorously developed. The number and total length of railway tunnel construction rank first in the world. The contradiction between the increasing scale of tunnel construction and the imperfection of tunnel construction theory is becoming more and more prominent. The tunnel design theory dominated by empirical design method will face a huge challenge. This paper focuses on the secondary lining supporting structure of tunnel. By means of theoretical analysis, engineering test and numerical calculation, the mechanical characteristics of secondary lining structure are studied deeply. It provides reference for the optimization of the design scheme of secondary lining structure. The main results are as follows: (1) the bearing characteristics of the secondary lining structure are analyzed from the phenomenon. Based on the ABAQUS platform, the three-dimensional finite element model of practical engineering is established. The crack distribution law and crack propagation process of the secondary lining are analyzed by using the extended finite element method (XFEM), and the crack distribution law of the secondary lining is pointed out. The appearance of fracture and its occurrence mechanism. The formation conditions have an important influence on the distribution and type of cracks in the secondary lining. With the increasing of pressure coefficient on the side of the stratum, longitudinal cracks occur successively on the inside of the arch. There are circumferential cracks on the left and right sides of the structure and circumferential cracks on the outer side of the bottom of the structure. (2) the bearing characteristics of the secondary lining structure are analyzed from the point of view of mechanism. Using numerical simulation method and introducing plastic damage constitutive model of concrete, the bearing characteristics of secondary lining structure are analyzed. The typical elasto-plastic failure process of secondary lining structure is defined, and the arch foot is the most vulnerable area, so reinforcement measures should be taken. For two types of structures, reinforced concrete secondary lining and plain concrete secondary lining, the failure law of reinforced concrete secondary lining under different stratum conditions is obtained, and the effect of reinforcement on strengthening the mechanical properties of secondary lining is summarized. The reliability of the numerical analysis is verified by comparing the numerical solution with the analytical solution. (3) based on the example of on-the-spot monitoring in the experimental section of Hejie tunnel of Guiguang high-speed railway, and combined with the statistical analysis of the secondary lining stress engineering case, the stress characteristics behind the secondary lining are obtained. It is pointed out that when the most unfavorable stress state of the secondary lining occurs when the mould is removed, the contact pressure between the initial support and the second lining presents a large distribution dispersion, and the load on the secondary lining is actually the deformation pressure transmitted from the initial support. It is different from the loose pressure calculated by the height of loose body in the standard. The contact pressure of the arch is small.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451.4

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本文編號(hào)：2448693