高速鐵路隧道二次襯砌力學(xué)特性研究
發(fā)布時間：2019-03-28 08:15
【摘要】：近年來,以客運專線為重點的全國鐵路網(wǎng)建設(shè)已經(jīng)全面展開并得到了蓬勃發(fā)展,鐵路隧道建設(shè)數(shù)量和總長度均位居世界第一。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)驗設(shè)計方法為主導(dǎo)的隧道設(shè)計理論將迎來巨大的挑戰(zhàn)。本文重點關(guān)注隧道二次襯砌支護(hù)結(jié)構(gòu),通過理論分析、工程試驗和數(shù)值計算相結(jié)合的技術(shù)手段對二次襯砌結(jié)構(gòu)力學(xué)特性展開深入研究,對二次襯砌結(jié)構(gòu)設(shè)計方案的優(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。基于ABAQUS平臺建立實際工程的三維有限元模型,運用擴(kuò)展有限元法(XFEM)對于二次襯砌裂縫進(jìn)行分析,指出二次襯砌裂縫分布規(guī)律、裂縫擴(kuò)展過程、裂縫外觀表現(xiàn)形式及發(fā)生機(jī)制。地層條件對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程,拱腳是最易破壞區(qū)域,應(yīng)采取加固措施；對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)了配筋對于增強(qiáng)二次襯砌力學(xué)性能所發(fā)揮的作用；通過數(shù)值解與解析解的比較,驗證了數(shù)值分析的可靠性。 (3)依托貴廣高速鐵路賀街隧道實驗段工程現(xiàn)場監(jiān)測實例,并結(jié)合二次襯砌受力工程案例統(tǒng)計分析,得到二次襯砌背后受力特點。指出二次襯砌最不利受力狀態(tài)出現(xiàn)在拆模時,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際上是初支傳遞過來的形變壓力,與規(guī)范上采用松散體高度計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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U451.4
[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)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U451.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 黃宏偉;劉德軍;薛亞東;王平讓;劉印;;基于擴(kuò)展有限元的隧道襯砌裂縫開裂數(shù)值分析[J];巖土工程學(xué)報;2013年02期
2 陳培帥;陳衛(wèi)忠;莊嚴(yán);;基于斷裂力學(xué)的巖爆破壞形跡兩級預(yù)測方法研究[J];巖土力學(xué);2013年02期
3 李鵬飛;張頂立;趙勇;周燁;房倩;張，
本文編號：2448693
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2448693.html
教材專著
