本文選題：凍害防治措施　切入點(diǎn)：現(xiàn)場(chǎng)監(jiān)測(cè)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著西部大開(kāi)發(fā)和振興東北老工業(yè)基地等國(guó)家政策的實(shí)施，大量寒區(qū)隧道正在東北及西部地區(qū)興建。與一般隧道相比，寒區(qū)隧道會(huì)面臨更多更復(fù)雜的技術(shù)難題，這其中首當(dāng)其沖的就是凍害防治問(wèn)題。國(guó)內(nèi)外多座寒區(qū)隧道均遭受不同程度的凍害，嚴(yán)重影響隧道的正常使用功能，進(jìn)而危害行車安全。因此，在寒區(qū)隧道建設(shè)中如何采取行之有效的措施，規(guī)避或減少凍害的發(fā)生，提高隧道的使用壽命，是目前隧道工程界亟待解決的問(wèn)題，開(kāi)展寒區(qū)隧道溫度場(chǎng)與保溫防寒技術(shù)研究具有重大的工程實(shí)際意義和廣闊的應(yīng)用前景。本文以正在建設(shè)的吉圖琿高鐵東興隧道為研究對(duì)象，通過(guò)現(xiàn)場(chǎng)監(jiān)測(cè)和數(shù)值模擬相結(jié)合的方法，開(kāi)展寒區(qū)隧道凍害防治的研究。主要的研究?jī)?nèi)容如下： 首先，結(jié)合東興隧道的特殊的工程地質(zhì)條件，分析了原有保溫防寒措施的不足，，提出了改良的保溫防寒措施。將隧道的一個(gè)10m長(zhǎng)的區(qū)段作為試驗(yàn)段，改變隧道原有保溫措施的構(gòu)造，對(duì)比研究改良方案的保溫防寒措施相對(duì)于原方案的有效性。 接著，試驗(yàn)段中設(shè)置兩個(gè)監(jiān)測(cè)斷面，每個(gè)斷面在襯砌和圍巖中埋設(shè)若干個(gè)溫度傳感器和土壓力盒。在試驗(yàn)段附近設(shè)置兩個(gè)相同的監(jiān)測(cè)斷面作為對(duì)照，通過(guò)對(duì)現(xiàn)場(chǎng)測(cè)試的溫度場(chǎng)數(shù)據(jù)進(jìn)行分析，揭示洞外氣溫、隧道內(nèi)氣溫、襯砌及圍巖內(nèi)部溫度和可能出現(xiàn)的圍巖凍脹力的變化規(guī)律。監(jiān)測(cè)周期從2013年11月至次年5月，基本涵蓋了東興隧道初凍期→深凍期→春融期→正常期整個(gè)凍融循環(huán)過(guò)程。 隨后，建立東興隧道溫度場(chǎng)的瞬態(tài)有限元分析模型，并根據(jù)測(cè)得的隧道內(nèi)的環(huán)境溫度，將其作為溫度荷載施加到隧道二次襯砌表面，計(jì)算隧道的單日溫度場(chǎng)，將計(jì)算結(jié)果與監(jiān)測(cè)結(jié)果對(duì)比，驗(yàn)證有限元模型的可靠性。結(jié)合延吉市當(dāng)?shù)氐臍庀筚Y料，用氣象學(xué)中常用的正弦回歸法擬合出隧道全年氣溫變化曲線，將此溫度曲線作為荷載施加到模型上，據(jù)此研究隧道在運(yùn)營(yíng)期間襯砌及圍巖的溫度場(chǎng)以及可能出現(xiàn)的凍害。 最后，結(jié)合已建立并經(jīng)過(guò)驗(yàn)證的有限元模型，研究不同的保溫層構(gòu)造和材料對(duì)保溫防寒效果的影響，進(jìn)行參數(shù)分析，提出隧道保溫層優(yōu)化設(shè)計(jì)方案。為同類型工程提供參考經(jīng)驗(yàn)。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U457.2

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本文編號(hào)：1641081