【摘要】：隧道初期支護即噴錨支護是在隧道開挖過程中控制隧道圍巖變形,調整隧道圍巖應力狀態(tài),保證隧道掘進施工過程安全進行的重要手段,也是承擔圍巖壓力荷載的重要支護結構。但是,相較于噴錨支護在實際工程中的廣泛應用,對于隧道初支結構中各部件之間的相互作用關系,以及這些支護部件在參數(shù)上的不同選擇對支護效果以及其部件自身的影響仍然認識模糊,在這放面很大程度上仍需要更加深入的研究與探討。本論文根據(jù)噴錨支護現(xiàn)有理論以及巖土工程領域相關理論知識結合我國公路隧道設計規(guī)范中給出的相關圍巖主要參數(shù)以及隧道復合式襯砌設計中的相關參數(shù)取值范圍為依據(jù),對初支結構進行數(shù)值模擬分析。論文的主要內容如下:1)對初支結構中錨桿、噴射混凝土的主要支護理論進行分析研究,對錨桿的錨固力、錨桿錨固力對圍巖的作用機理以及噴射混凝土支護對圍巖的作用機理進行分析研究,從定性的角度解釋初支結構中錨桿、噴射混凝土對隧道圍巖的支護效果。2)運用有限元計算軟件Madis/GTS通過數(shù)值模擬分析從圍巖與支護結構的相互作用關系中分析支護結構對圍巖的加固機理。3)運用有限元計算軟件Madis/GTS對隧道初支結構進行模擬分析,通過對初支結構中個子支護結構不同支護參數(shù)的選取,分析初支結構中支護參數(shù)變化對圍巖支護效果的影響。
[Abstract]:Shotcrete anchor support is an important means to control the deformation of surrounding rock, adjust the stress state of surrounding rock, and ensure the safety of tunneling construction in the early stage of tunnel excavation. It is also an important supporting structure to bear the pressure load of surrounding rock. However, compared with the wide application of shotcrete and anchor support in practical engineering, the interaction between the components in the primary branch structure of tunnel is studied. And the influence of different parameters of these supporting parts on the support effect and the part itself is still unclear. To a large extent, it is still necessary to further study and discuss the caving surface. According to the existing theory of shotcreting and anchor support and the relevant theoretical knowledge in geotechnical engineering field combined with the main surrounding rock parameters given in the design code of highway tunnel in our country and the range of relevant parameters in the design of composite lining of tunnel as the basis of this paper. The numerical simulation analysis of the initial branch structure is carried out. The main contents of this paper are as follows: (1) the main supporting theory of bolt and shotcrete in primary support structure is analyzed and studied, and the anchoring force of bolt is studied. The mechanism of anchor force acting on surrounding rock and the action mechanism of shotcrete support on surrounding rock are analyzed and studied, and the anchors in primary support structure are explained qualitatively. The effect of shotcrete on supporting surrounding rock of tunnel. 2) using finite element calculation software Madis/GTS to analyze the reinforcement mechanism of surrounding rock from the interaction between surrounding rock and supporting structure by numerical simulation. 3) using finite element method. The software Madis/GTS is used to simulate and analyze the initial branch structure of the tunnel. Through the selection of different supporting parameters of sub-support structure in primary support structure, the influence of support parameters in primary support structure on the support effect of surrounding rock is analyzed.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U455.7

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本文編號：2223143