本文選題：寒區(qū)隧道　切入點：通風　出處：《西安科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,我國鐵路建設區(qū)域已經延伸至西北部高寒地區(qū),而與常規(guī)隧道相比,寒區(qū)隧道因隧址區(qū)位置以及氣候原因導致凍害頻發(fā),嚴重影響了隧道主體結構的安全性,以致影響了隧道正常運營。溫度是寒區(qū)隧道凍害發(fā)生的主要因素之一,故為防治寒區(qū)隧道發(fā)生凍害,必須了解高寒地區(qū)隧道圍巖及襯砌溫度場分布及變化規(guī)律。本文主要對寒區(qū)隧道圍巖及襯砌的溫度場基礎理論進行分析,論述了溫度場基本概念、邊界條件及其分類和影響因素等相關理論;基于流體力學、傳熱學和空氣動力學的基本原理與方法,推導出考慮通風條件下的寒區(qū)隧道圍巖溫度場模型,并對湍流數(shù)值模擬方法與熱交換理論進行分析。在此基礎上,運用大型有限元軟件ANSYS及ANSYS-FLUENT模塊,通過簡單算例驗證風流場模型及其采用的湍流數(shù)值模擬方法的可行性,探討風速、風溫對圍巖溫度場的影響規(guī)律;在考慮昆侖山隧道工程地質條件情況下,采用數(shù)值分析方法探討其在通風條件下圍巖及襯砌在施工、運營期間溫度場的變化規(guī)律及其防寒保溫措施,并進一步考慮熱力學基礎上模擬分析寒區(qū)隧道圍巖及襯砌位移、應力分布規(guī)律,從熱力學的角度出發(fā),分析各項防寒保溫措施的優(yōu)缺點。研究結果表明:風溫、風速分別通過熱傳導、熱交換兩種方式對圍巖及襯砌溫度場產生直接、間接影響,對溫度場的影響程度隨風速、風溫的逐漸增大分別呈現(xiàn)先增大后趨于平緩、逐漸增大的趨勢;通風對隧道洞口處影響程度略大于隧道中部,并隨圍巖埋深增加其影響程度逐漸減小;保溫隔熱層的設置對寒區(qū)隧道能起到明顯的保溫隔熱效果,表面隔熱法優(yōu)于雙層襯砌隔熱法。
[Abstract]:In recent years, the railway construction area of our country has been extended to the northwestern alpine region. Compared with the conventional tunnel, the tunnel in the cold region is frequently damaged by freezing damage due to the location of the tunnel site and climate, which seriously affects the safety of the main structure of the tunnel. The temperature is one of the main factors of the freezing injury in the tunnel in cold region, so it is necessary to prevent the freezing injury in the tunnel in the cold region. It is necessary to understand the distribution and variation law of temperature field in surrounding rock and lining of tunnel in cold area. The basic theory of temperature field of surrounding rock and lining of tunnel in cold region is analyzed in this paper, and the basic concept of temperature field is discussed. Based on the basic principles and methods of fluid mechanics, heat transfer and aerodynamics, the temperature field model of tunnel surrounding rock in cold region considering ventilation condition is derived. The numerical simulation method of turbulence and the heat exchange theory are analyzed. On the basis of this, the feasibility of the wind flow model and the turbulent numerical simulation method is verified by using the large finite element software ANSYS and ANSYS-FLUENT module, and a simple example is given to verify the feasibility of the wind flow model and the turbulence numerical simulation method. The influence of wind speed and wind temperature on surrounding rock temperature field is discussed, and considering the engineering geological conditions of Kunlun Mountain Tunnel, the construction of surrounding rock and lining under ventilation condition is discussed by using numerical analysis method. The variation law of temperature field and the measures of preventing cold and heat preservation during operation are discussed. Based on the thermodynamic analysis, the surrounding rock and lining displacement and stress distribution of tunnel in cold region are simulated and analyzed, and from the point of view of thermodynamics, The advantages and disadvantages of various measures for preventing cold and heat preservation are analyzed. The results show that the influence of wind temperature and wind speed on the surrounding rock and lining temperature field is direct and indirect through heat conduction and heat exchange, and the influence degree on the temperature field depends on the wind speed. The gradual increase of wind temperature shows a trend of first increasing then levelling and gradually increasing; the influence degree of ventilation on tunnel entrance is slightly greater than that in the middle of tunnel and the influence degree decreases gradually with the increase of surrounding rock depth. The setting of thermal insulation layer has obvious heat insulation effect on the tunnel in cold area, and the surface insulation method is superior to the double lining insulation method.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U451

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本文編號：1560500