吉图珲高铁东兴隧道冻害防治技术研究

发布时间：2018-03-20 22:31

本文选题：冻害防治措施　切入点：现场监测　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着西部大开发和振兴东北老工业基地等国家政策的实施，大量寒区隧道正在东北及西部地区兴建。与一般隧道相比，寒区隧道会面临更多更复杂的技术难题，这其中首当其冲的就是冻害防治问题。国内外多座寒区隧道均遭受不同程度的冻害，严重影响隧道的正常使用功能，进而危害行车安全。因此，在寒区隧道建设中如何采取行之有效的措施，规避或减少冻害的发生，提高隧道的使用寿命，是目前隧道工程界亟待解决的问题，开展寒区隧道温度场与保温防寒技术研究具有重大的工程实际意义和广阔的应用前景。本文以正在建设的吉图珲高铁东兴隧道为研究对象，通过现场监测和数值模拟相结合的方法，开展寒区隧道冻害防治的研究。主要的研究内容如下：首先，结合东兴隧道的特殊的工程地质条件，分析了原有保温防寒措施的不足，，提出了改良的保温防寒措施。将隧道的一个10m长的区段作为试验段，改变隧道原有保温措施的构造，对比研究改良方案的保温防寒措施相对于原方案的有效性。接着，试验段中设置两个监测断面，每个断面在衬砌和围岩中埋设若干个温度传感器和土压力盒。在试验段附近设置两个相同的监测断面作为对照，通过对现场测试的温度场数据进行分析，揭示洞外气温、隧道内气温、衬砌及围岩内部温度和可能出现的围岩冻胀力的变化规律。监测周期从2013年11月至次年5月，基本涵盖了东兴隧道初冻期→深冻期→春融期→正常期整个冻融循环过程。随后，建立东兴隧道温度场的瞬态有限元分析模型，并根据测得的隧道内的环境温度，将其作为温度荷载施加到隧道二次衬砌表面，计算隧道的单日温度场，将计算结果与监测结果对比，验证有限元模型的可靠性。结合延吉市当地的气象资料，用气象学中常用的正弦回归法拟合出隧道全年气温变化曲线，将此温度曲线作为荷载施加到模型上，据此研究隧道在运营期间衬砌及围岩的温度场以及可能出现的冻害。最后，结合已建立并经过验证的有限元模型，研究不同的保温层构造和材料对保温防寒效果的影响，进行参数分析，提出隧道保温层优化设计方案。为同类型工程提供参考经验。
[Abstract]:With the implementation of national policies such as the large-scale development of the western region and the revitalization of the old industrial base in northeast China, a large number of tunnels in cold regions are being built in the northeast and western regions. Compared with ordinary tunnels, tunnels in cold regions will face more and more complicated technical problems. Many tunnels in cold regions at home and abroad are subjected to different degrees of freezing damage, which seriously affects the normal use of the tunnel, and then endangers the safety of traffic. How to take effective measures to avoid or reduce the occurrence of freezing damage and improve the service life of tunnel in cold region are the problems that need to be solved urgently in tunnel engineering field at present. It is of great practical significance and broad application prospect to study the temperature field and heat preservation and cold prevention technology of tunnel in cold region. This paper takes Dongxing Tunnel of Jituhui High Speed Railway as the research object. Through the combination of field monitoring and numerical simulation, the study on the prevention and treatment of freezing injury of tunnels in cold region is carried out. The main research contents are as follows:. Firstly, combined with the special engineering geological conditions of Dongxing Tunnel, the shortcomings of the original insulation and cold prevention measures are analyzed, and the improved insulation and cold prevention measures are put forward. A 10m long section of the tunnel is taken as the test section. By changing the structure of the original insulation measures of the tunnel, the effectiveness of the improved heat preservation and cold prevention measures is compared with that of the original ones. Then, two monitoring sections are set up in the test section, each section is embedded with several temperature sensors and earth pressure boxes in the lining and surrounding rock, and two identical monitoring sections are set in the vicinity of the test section as a control. Based on the analysis of the temperature field data measured in the field, the variation law of the temperature outside the tunnel, the temperature inside the tunnel, the temperature inside the lining and surrounding rock and the frost heaving force of the surrounding rock are revealed. The monitoring period is from November 2013 to May of the following year. It basically covers the initial freezing period of Dongxing Tunnel. 鈫扗eep freezing period. 鈫扴pring melting period. 鈫扵he whole process of freeze-thaw cycle in normal period. Then, the transient finite element analysis model of the temperature field of Dongxing Tunnel is established. According to the measured ambient temperature of the tunnel, it is applied as a temperature load to the secondary lining surface of the tunnel to calculate the single-day temperature field of the tunnel. By comparing the calculated results with the monitoring results, the reliability of the finite element model is verified. Combined with the local meteorological data of Yanji City, the annual temperature variation curve of the tunnel is fitted by the sinusoidal regression method commonly used in meteorology. The temperature curve is applied to the model as a load to study the temperature field of tunnel lining and surrounding rock during operation and the possible freezing damage. Finally, combined with the established and verified finite element model, the effects of different insulation layer structures and materials on the effect of insulation and cold protection are studied, and the parameters are analyzed. The optimum design scheme of the insulation layer of tunnel is put forward, which provides reference experience for the same type of engineering.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2

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