發(fā)布時間：2018-04-13 02:34

  本文選題：互通隧道 + 通風阻力　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：近年來,隨著中國公路路網(wǎng)的大力建設(shè),公路隧道因其具有優(yōu)化公路直線性、減少行車距離等優(yōu)勢,公路隧道被大量的應(yīng)用到公路路網(wǎng)建設(shè)中。隨著隧道建造技術(shù)的發(fā)展,大型互通立交隧道逐漸在公路隧道中出現(xiàn)。因為互通立交隧道在結(jié)構(gòu)形式上存在著隧道的匯合與分岔,在隧道發(fā)生火災(zāi)時,尤其是在分岔處發(fā)生火災(zāi)時,對火災(zāi)煙氣的遷移規(guī)律及對火災(zāi)煙氣的控制勢必與傳統(tǒng)單管隧道不同。本文以深圳市過境高速公路連接線工程為依托,利用Fluent數(shù)值模擬軟件,對大型互通立交隧道通風阻力以及發(fā)生火災(zāi)時的煙氣遷移規(guī)律及控制進行了研究分析。本文首先查閱了相關(guān)文獻,結(jié)合前人的研究成果,分析了大型互通立交隧道的結(jié)構(gòu)特征,確定大型互通立交隧道火災(zāi)煙氣遷移規(guī)律及控制研究的重點是大型互通立交隧道通風氣流阻力分析,火災(zāi)煙氣遷移規(guī)律研究和大型互通立交隧道火災(zāi)臨界風速影響因素分析。其次,由于隧道通風阻力是影響整個隧道的通風性能和效果的一個重要因素。因此,全面的、系統(tǒng)的分析和研究隧道通風阻力是非常重要的。本論文運用Fluent軟件,對長大互通立交隧道通風系統(tǒng)的各個細部進行三維數(shù)值模擬分析和研究。主要內(nèi)容包括：不同斷面直線隧道的沿程阻力、不同斷面曲線隧道的沿程阻力、車行橫通道開啟時的局部阻力、隧道分岔處的局部阻力。然后,基于深圳東通道連接線工程隧道具有隧道的匯合與分叉的特點,火災(zāi)發(fā)生時的煙氣場與速度場勢必與傳統(tǒng)單管隧道不同,因此運用Fluent軟件,對深圳東通道連接線工程隧道在不同火災(zāi)情景下的煙氣分布規(guī)律、溫度分布規(guī)律與速度分布規(guī)律進行了分析和研究。通過使用20MW火源,分析了不同斷面直線段隧道、隧道分岔處合流與分流時的臨界風速以及煙氣場、溫度場與速度場,為長大互通立交隧道通風系統(tǒng)設(shè)計提供具體參數(shù)。最后,將大型互通立交隧道的分岔口進行合理簡化,忽略了隧道的曲線變化,運動局部分析的方法,分別采用5MW、20MW和50MW火源研究分析了分岔角度、分岔上下游橫截面積比和分岔處連拱長度對火災(zāi)煙氣控制的影響。
[Abstract]:In recent years, with the construction of highway network in China, highway tunnel is widely used in highway network construction because of its advantages of optimizing highway straightness and reducing driving distance.With the development of tunnel construction technology, large interchange tunnel appears gradually in highway tunnel.Because there is a confluence and bifurcation in the structure of the interchange tunnel, when the tunnel fire occurs, especially when the fire occurs at the bifurcation,The law of fire smoke migration and the control of fire smoke are bound to be different from the traditional single tube tunnel.In this paper, based on Shenzhen transit highway connecting line project, the ventilation resistance and smoke migration law and control of large-scale interchange tunnel are studied and analyzed by using Fluent numerical simulation software.In this paper, we first refer to the relevant documents and analyze the structural characteristics of large interchange tunnels, combining with the previous research results.In order to determine the fire smoke migration law and control of large interchange tunnel, the key points are the analysis of ventilation air flow resistance, the study of fire smoke migration law and the analysis of the factors affecting the fire critical wind speed of large interchange tunnel.Secondly, ventilation resistance is an important factor affecting ventilation performance and effect of the whole tunnel.Therefore, comprehensive, systematic analysis and study of tunnel ventilation resistance is very important.In this paper, the three-dimensional numerical simulation and research on the ventilation system of long-long interchange tunnel are carried out by using Fluent software.The main contents are as follows: the resistance along the tunnel with different cross sections, the resistance along the tunnel with different section curves, the local resistance at the opening of the vehicular cross passage, and the local resistance at the bifurcation of the tunnel.Then, based on the characteristic of confluence and bifurcation of tunnel in Shenzhen East Tunnel, the smoke field and velocity field will be different from the traditional single-tube tunnel when the fire occurs. Therefore, Fluent software is used.The distribution law of smoke, temperature and velocity of the tunnel of Shenzhen East Corridor connecting Line under different fire conditions are analyzed and studied in this paper.By using 20MW fire source, the critical wind speed, flue gas field, temperature field and velocity field of tunnel with different cross sections and bifurcation are analyzed, which provide specific parameters for the design of ventilation system of long and long interchange tunnel.Finally, the bifurcation of the large interchange tunnel is reasonably simplified, the curve change of the tunnel is ignored, and the method of motion local analysis is used. The bifurcation angle is analyzed by using 5MW 20 MW and 50MW fire source, respectively.The influence of cross sectional area ratio of upstream and downstream of bifurcation and the length of multiple arch at bifurcation on fire smoke control.
【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】：U458

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本文編號：1742575