【摘要】：在高緯度寒區(qū)隧道施工中,由于過低的溫度條件,造成冬季洞內(nèi)氣溫低,人員和機械的工作效率不高,且洞口段容易出現(xiàn)凍害現(xiàn)象。了解隧道施工通風(fēng)熱環(huán)境及其變化規(guī)律,是高緯度寒區(qū)隧道科學(xué)合理施工的前提。本文依托中鐵隧道集團承建的某高緯度寒區(qū)隧道施工工程,采用現(xiàn)場調(diào)研和數(shù)值模擬的方法,對高緯度寒區(qū)隧道施工通風(fēng)熱環(huán)境進行研究。主要內(nèi)容如下：首先,通過對位于高緯度寒區(qū)的隧道施工現(xiàn)場調(diào)研,了解高緯度寒區(qū)隧道施工特點、施工組織和施工工藝等熱環(huán)境影響因素；通過現(xiàn)場測試并結(jié)合施工方提供的數(shù)據(jù),得到隧道施工洞內(nèi)氣溫分布、風(fēng)管漏風(fēng)和圍巖溫度分布規(guī)律；建立隧道施工通風(fēng)數(shù)值計算模型并對數(shù)值模擬合理性進行驗證。然后,針對數(shù)值模擬方法在隧道施工熱環(huán)境研究中存在的時間步長小、計算規(guī)模大、模擬周期長,計算耗費的時間過長的問題,提出將相似原理運用到隧道施工熱環(huán)境數(shù)值模擬中,通過理論分析和數(shù)值驗證的方法對相似原理在隧道施工通風(fēng)熱環(huán)境數(shù)值模擬中的適用性進行了研究。最后,建立綜合考慮風(fēng)管漏風(fēng)和隧道圍巖的三維計算模型,利用FLUENT軟件模擬隧道施工掘進過程對隧道施工通風(fēng)熱環(huán)境進行周期為兩年的三維數(shù)值模擬研究,得到圍巖溫度和風(fēng)管漏風(fēng)對洞內(nèi)氣溫和洞口段圍巖凍結(jié)長度影響規(guī)律。
[Abstract]:In the construction of tunnel in high latitude cold region, due to the low temperature condition, the temperature in the tunnel is low in winter, the working efficiency of personnel and machinery is not high, and the freezing damage phenomenon is easy to appear in the entrance section of the tunnel. Understanding the ventilation and thermal environment of tunnel construction and its changing law is the premise of scientific and reasonable construction of tunnel in high latitude cold region. Based on the construction project of a high latitude cold region tunnel built by ZhongRailway Tunnel Group, this paper studies the ventilation and thermal environment of tunnel construction in high latitude cold region by means of field investigation and numerical simulation. The main contents are as follows: firstly, through the investigation of the tunnel construction site in the high latitude cold region, the thermal environment influencing factors such as the construction characteristics, construction organization and construction technology of the tunnel in the high latitude cold region are understood. Through field test and combined with the data provided by the construction party, the temperature distribution, air leakage and surrounding rock temperature distribution in the tunnel construction are obtained, and the numerical calculation model of tunnel construction ventilation is established and the rationality of the numerical simulation is verified. Then, in order to solve the problems of small time step, large calculation scale, long simulation period and too long calculation time in the study of tunnel construction thermal environment, the numerical simulation method has the advantages of small time step, large calculation scale, long simulation period and too long calculation time. The similarity principle is applied to the numerical simulation of tunnel construction thermal environment, and the applicability of similarity principle in tunnel construction ventilation thermal environment numerical simulation is studied by means of theoretical analysis and numerical verification. Finally, a three-dimensional calculation model considering air leakage and surrounding rock of tunnel is established, and the three-dimensional numerical simulation of ventilation and thermal environment of tunnel construction is carried out by using FLUENT software to simulate the excavation process of tunnel construction. The effects of surrounding rock temperature and air leakage on the air temperature in the tunnel and the freezing length of the surrounding rock in the entrance section of the tunnel are obtained.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455

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1 肖益民;付祥釗;;地下空間圍護結(jié)構(gòu)傳熱熱力系統(tǒng)劃分的頻率特性分析法[A];全國暖通空調(diào)制冷2006年學(xué)術(shù)年會論文集[C];2006年

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本文編號：2485194