【摘要】：隨著我國經(jīng)濟的高速發(fā)展,考慮我國國土面積之大,地區(qū)地理情況高低起伏,尤其在一些地方山嶺較多,為方便地方經(jīng)濟、物質(zhì)、文化的交流,修建隧道已成為解決這類問題的首選方法。分離式隧道在發(fā)展工程中得到較為廣泛的應(yīng)用,但是隧道凈距難以通過規(guī)范進行最為合理的確定。凈距過大容易造成占地面積大,養(yǎng)護不方便等一些列問題,這樣小凈距隧道和連拱式隧道應(yīng)運而生,但連拱隧道施工工期較長,工藝復(fù)雜,且存在漏水、中墻出現(xiàn)裂縫等問題,因此該結(jié)構(gòu)型式的應(yīng)用受到廣泛質(zhì)疑。小凈距隧道可以較好地解決雙洞的接線問題,同時有效的避免連拱式隧道,工期長,工藝復(fù)雜,造價高等問題,因此小凈距隧道在山區(qū)隧道施工得到廣泛的應(yīng)用。本文利用戴云山隧道為背景,利用理論分析,數(shù)值模擬等方法對小凈距雙洞隧道施工方法(臺階法),中巖墻厚度,不同圍巖級別進行研究。利用有限元模擬軟件MIDAS GTS NX對不同級圍巖,不同厚中巖墻,雙洞不同進深施工進度等進行模擬,通過激活和鈍化單元,來進行模擬開挖的過程,觀察隧道的圍巖變形,應(yīng)力應(yīng)變,塑性區(qū)大小,得出合理的開挖方式,合理的凈距。通過模擬我們發(fā)現(xiàn),在拱腰處一般會出現(xiàn)較大應(yīng)力,在拱頂處和仰拱處會出現(xiàn)較大豎向位移,拱頂處豎向位移數(shù)值大于仰拱處；臺階法施工在不同圍巖條件下,無論臺階長度如何變化,兩隧道施工進度差越小,中巖墻厚度越小,對圍巖穩(wěn)定性的影響越大,變形相對增大。
[Abstract]:With the rapid development of our country's economy, considering the large area of our country and the high and low geographical conditions of the region, especially in some places, the construction of tunnel has become the first choice for the convenience of local economy, material and culture, and the construction of the tunnel has been widely used in the development project, but it has been widely used in the development project. It is difficult to make the most reasonable determination of the net distance of the tunnel through the standard. It is easy to cause the large area of the area and the inconvenient maintenance of the tunnel. So the small distance tunnel and the continuous arch tunnel emerge as the times require, but the construction time of the tunnel is long, the process is complicated, and the cracks in the middle wall exist, so the structure type is formed. The application has been widely questioned. Small net distance tunnel can solve the problem of double hole wiring better, and effectively avoid arch tunnel, long construction time, complex process and high cost. So the small distance tunnel is widely used in the construction of mountain tunnel. This paper uses the Dai Yun mountain tunnel as the background, uses theoretical analysis, numerical simulation and so on. Methods to study the construction method of small net distance double tunnel (step method), the thickness of the middle rock wall and the different surrounding rock grade. Using the finite element simulation software MIDAS GTS NX to simulate the construction progress of different grade rock, different thick middle rock wall and double hole deep construction, through activation and passivation units, the process of simulating excavation is carried out to observe the tunnel. The surrounding rock deformation, stress strain, plastic zone size, reasonable excavation method and reasonable spacing are obtained. Through simulation we find that large stress will appear at the arch and the greater vertical displacement at the vault and arch, and the vertical displacement at the vault is greater than the inverted arch; step method is constructed under different surrounding rock conditions, no matter the platform. When the length of the tunnel is changed, the smaller the two tunnel construction schedule is, the smaller the thickness of the middle rock wall is, the greater the influence on the stability of the surrounding rock will be and the larger the deformation will be.
【學位授予單位】：山東建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U455.4;U451.2

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相關(guān)期刊論文 前6條

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本文編號：2131530