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  本文關鍵詞： 隧道工程 深淺埋劃分方法 限界 泥巖 砂巖　出處：《重慶交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著我國經(jīng)濟的快速發(fā)展,城市日益發(fā)展與城市交通擁堵的矛盾愈加明顯。就城市發(fā)展而言,僅靠以往的“金橋銀路”已無法解決城市擁堵的問題,地面交通的開發(fā)已經(jīng)受到城市土地資源匱乏的嚴重制約,目前乃至將來要想解決這個問題只有深度開發(fā)城市地下空間資源,即大力發(fā)展城市地鐵、隧道。眾所周知隧道屬于地下結構范疇,正確的區(qū)分隧道深淺埋類別對于隧道安全以及經(jīng)濟性都將起到極其重要的作用。隧道,無論是公路隧道還是鐵路隧道,當它穿越在山體內或者地下時,隧道結構上部將承受來自周圍圍巖的壓力,一個怎樣的埋深深度才是該類地層隧道深淺埋的限界呢?以及如何應勢選擇支護形式對于隧道修建以及運營而言都顯得異常重要。因此,如何根據(jù)隧道實際地質類別準確確定隧道埋深類別就顯得尤為重要,而非單靠模糊性很強的經(jīng)驗數(shù)據(jù)來確定。本文將以重慶開縣猴子巖隧道為工程實例,根據(jù)工程勘測、工程設計數(shù)據(jù)以及相關規(guī)范,并結合ANSYS有限元分析軟件對該隧道深淺埋限界以及隧道支護形式提出一個合理的參考,為今后類似工程的修建提供參考。通過查閱并分析相關資料、文獻,以及ANSYS有限元模擬,得出以下結論:①提出了通過分析隧道開挖后地表沉降規(guī)律判別隧道深淺埋限界的方法—地表沉降變化法。但其結果表明得出的深淺埋限界深度與規(guī)范推薦值差距較大,就目前情況而言作為判別隧道深淺埋的方法還尚欠妥當。②提出隧道深淺埋界定方法—圍巖應力變化法,即通過分析隧道開挖前后拱頂正上方系列節(jié)點豎向應力變化規(guī)律得到隧道深淺埋限界,同時與規(guī)范推薦的深淺埋限界深度符合性較好。③通過有限元模擬計算,得到全斷面泥巖地層以及砂巖地層2車道公路隧道深淺埋限界深度分別為19m和30m。同時考慮實際工程地質條件為大斷面泥巖偶夾雜少量砂巖情況,將全斷面泥巖和全斷面砂巖綜合考慮,從安全角度取綜合地質情況深淺埋限界為19m~30m。④鑒于工程情況比較復雜,在實際工程中確定深淺埋限界時應結合工程實際情況綜合判斷。
[Abstract]:In recent years, with the rapid development of China's economy, the contradiction between urban development and urban traffic congestion is becoming more and more obvious. As far as urban development is concerned, the problem of urban congestion can not be solved by relying on the "Golden Bridge and Silver Road" in the past. The development of ground transportation has been seriously restricted by the scarcity of urban land resources. At present and even in the future, the only way to solve this problem is to develop urban underground space resources in depth, that is, to vigorously develop urban subway. Tunnels. As we all know, tunnels belong to the category of underground structures, and it will play an extremely important role in the safety and economy of tunnels to distinguish between the deep and shallow types of tunnels. Tunnel, whether it is a highway tunnel or a railway tunnel, When it passes through the mountain or underground, the tunnel structure will bear the pressure from surrounding rock. What depth is the boundary of the tunnel depth? And how to choose the supporting form is very important for tunnel construction and operation. Therefore, it is very important to determine the depth of tunnel according to the actual geological type of tunnel. This paper will take the Qianyan Tunnel of Kaixian County in Chongqing as an example, according to engineering survey, engineering design data and relevant specifications. Combined with the ANSYS finite element analysis software, a reasonable reference is put forward for the tunnel depth and shallow burying limit and the tunnel support form, which provides a reference for the construction of similar projects in the future. Through consulting and analyzing the relevant data, literature and ANSYS finite element simulation, The following conclusions are drawn as follows: 1. The method of ground subsidence variation is proposed by analyzing the law of ground subsidence after tunnel excavation, but the result shows that the difference between the depth of deep and shallow buried limit and the recommended value of code is large. In terms of the present situation, as a method of judging the depth and depth of the tunnel, it is still not appropriate .2 to put forward the method of defining the depth and depth of the tunnel, that is, the stress change method of surrounding rock. That is, by analyzing the vertical stress variation law of the series of joints above the arch roof before and after excavation, the tunnel depth and shallow burying limit is obtained. At the same time, the depth conformance with the depth of shallow and deep burying limit recommended by the code is good. 3. The finite element simulation calculation is carried out. It is obtained that the depth of shallow and shallow buried limit depth of two-lane highway tunnel is 19m and 30m, respectively. Considering the actual engineering geological conditions, a small amount of sandstone with large cross-section mudstone couple is considered. Considering the comprehensive consideration of full-section mudstone and full-section sandstone, taking the comprehensive geological condition depth and shallow burial limit as 19m / 30m.4 in view of the complex engineering situation, the comprehensive judgment should be combined with the engineering actual condition when determining the depth and shallow burial limit in practical engineering.
【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】：U452

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本文編號：1519407