考虑通风条件下寒区隧道围岩及衬砌温度场变化规律研究

发布时间：2018-03-03 09:42

本文选题：寒区隧道　切入点：通风　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,我国铁路建设区域已经延伸至西北部高寒地区,而与常规隧道相比,寒区隧道因隧址区位置以及气候原因导致冻害频发,严重影响了隧道主体结构的安全性,以致影响了隧道正常运营。温度是寒区隧道冻害发生的主要因素之一,故为防治寒区隧道发生冻害,必须了解高寒地区隧道围岩及衬砌温度场分布及变化规律。本文主要对寒区隧道围岩及衬砌的温度场基础理论进行分析,论述了温度场基本概念、边界条件及其分类和影响因素等相关理论;基于流体力学、传热学和空气动力学的基本原理与方法,推导出考虑通风条件下的寒区隧道围岩温度场模型,并对湍流数值模拟方法与热交换理论进行分析。在此基础上,运用大型有限元软件ANSYS及ANSYS-FLUENT模块,通过简单算例验证风流场模型及其采用的湍流数值模拟方法的可行性,探讨风速、风温对围岩温度场的影响规律;在考虑昆仑山隧道工程地质条件情况下,采用数值分析方法探讨其在通风条件下围岩及衬砌在施工、运营期间温度场的变化规律及其防寒保温措施,并进一步考虑热力学基础上模拟分析寒区隧道围岩及衬砌位移、应力分布规律,从热力学的角度出发,分析各项防寒保温措施的优缺点。研究结果表明:风温、风速分别通过热传导、热交换两种方式对围岩及衬砌温度场产生直接、间接影响,对温度场的影响程度随风速、风温的逐渐增大分别呈现先增大后趋于平缓、逐渐增大的趋势;通风对隧道洞口处影响程度略大于隧道中部,并随围岩埋深增加其影响程度逐渐减小;保温隔热层的设置对寒区隧道能起到明显的保温隔热效果,表面隔热法优于双层衬砌隔热法。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451

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