本文選題：黃土公路隧道 + 初期支護(hù)��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：隨著山區(qū)高速公路的建設(shè)和西部地區(qū)經(jīng)濟(jì)的高速發(fā)展，穿越黃土地區(qū)的公路隧道日益增多。由于黃土特殊的工程性質(zhì)和隧道工程的復(fù)雜性，通過工程類比法修建的黃土隧道在施工和運(yùn)營期間出現(xiàn)了許多病害，對黃土隧道的支護(hù)結(jié)構(gòu)優(yōu)化設(shè)計需要進(jìn)行深入研究。 本文結(jié)合大量已建的黃土隧道，通過資料調(diào)研、理論分析和數(shù)值模擬的方法對黃土公路隧道的初期支護(hù)體系提出采用鋼管混凝土代替鋼拱架，增加初期支護(hù)厚度，采用模筑混凝土代替噴射混凝土的優(yōu)化設(shè)計思想，采用MIDAS/GTS大型有限元軟件建立平面有限元模型，對鋼管的型式和尺寸進(jìn)行正交試驗，分析初期支護(hù)中不同鋼管尺寸對圍巖和隧道的影響性狀，并結(jié)合工程經(jīng)濟(jì)性推薦鋼管的型式和尺寸。對比原設(shè)計和優(yōu)化設(shè)計假定抗力法計算的初期支護(hù)安全系數(shù)，并用有限元模擬原設(shè)計和優(yōu)化設(shè)計的支護(hù)效果，結(jié)果表明優(yōu)化設(shè)計結(jié)構(gòu)的安全性和圍巖的位移和塑性區(qū)都得到了有效的控制。 采用MIDAS/GTS有限元軟件建立隧道開挖支護(hù)完成后浸水模型，對浸水條件下新型支護(hù)結(jié)構(gòu)的安全性進(jìn)行評價。結(jié)果表明：浸水降低了圍巖的自承能力，使圍巖整體產(chǎn)生了豎向位移，浸水使圍巖應(yīng)力再次重新分布，隧道周邊出現(xiàn)了應(yīng)力集中，浸水后圍巖塑性區(qū)的面積和最大塑性應(yīng)變值也都有所增大。對于支護(hù)結(jié)構(gòu)，浸水后仰拱的軸力增加較大，其他部位的軸力和彎矩受浸水影響較小。浸水對優(yōu)化設(shè)計的影響幅度大于原設(shè)計，，但是優(yōu)化設(shè)計的支護(hù)效果仍優(yōu)于原設(shè)計。
[Abstract]:With the construction of mountain highway and the rapid development of economy in western China, the number of highway tunnels passing through loess area is increasing day by day.Because of the special engineering properties of loess and the complexity of tunnel engineering, many diseases appear in the construction and operation of loess tunnel built by engineering analogy method. The optimization design of supporting structure of loess tunnel needs to be deeply studied.Combined with a large number of loess tunnels that have been built, through the investigation of data, theoretical analysis and numerical simulation method, this paper puts forward to the initial supporting system of loess highway tunnel using concrete filled steel tube instead of steel arch frame to increase the initial support thickness.In this paper, the optimum design idea of replacing shotcrete with formwork concrete is adopted, and the plane finite element model is established by using MIDAS/GTS software, and the type and size of steel pipe are tested by orthogonal test.This paper analyzes the influence of different steel pipe size on surrounding rock and tunnel in initial support, and recommends the type and size of steel pipe in combination with engineering economy.Compared with the initial support safety factor calculated by the original design and the optimization design assumed resistance method, the support effect of the original design and the optimization design is simulated by the finite element method.The results show that the security of the optimized design structure and the displacement and plastic zone of surrounding rock are effectively controlled.The MIDAS/GTS finite element software was used to establish the post-immersion model of tunnel excavation support, and the safety of the new support structure was evaluated under the condition of flooding.The results show that soaking reduces the self-supporting capacity of surrounding rock, causes vertical displacement of surrounding rock, redistributes the stress of surrounding rock, and presents stress concentration around tunnel.After immersion, the area of plastic zone and the maximum plastic strain value of surrounding rock are also increased.For the support structure, the axial force of the inverted arch increases greatly after immersion, and the axial force and bending moment of other parts are less affected by the immersion.The influence of water immersion on the optimal design is larger than that of the original design, but the support effect of the optimal design is still better than that of the original design.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.7

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