本文選題：雙洞毗鄰隧道　切入點(diǎn)：污染物擴(kuò)散　出處：《西南交通大學(xué)》2016年碩士論文

【摘要】：隨著高速公路不斷向山區(qū)發(fā)展,隧道及隧道群的建設(shè)已經(jīng)成為需要重點(diǎn)攻關(guān)的工程項(xiàng)目。另外,為了更好地利用車(chē)輛行駛產(chǎn)生的交通風(fēng),雙洞的單向隧道已經(jīng)成為常見(jiàn)的隧道形式,而縱向通風(fēng)也成為最常采用的隧道通風(fēng)方式。對(duì)于上下游間距較近的雙洞毗鄰隧道,排風(fēng)隧道排出的污染物會(huì)對(duì)洞外環(huán)境產(chǎn)生污染,同時(shí)也竄流進(jìn)入進(jìn)風(fēng)隧道產(chǎn)生“二次污染”。竄流問(wèn)題的存在會(huì)使得竄流的隧道通風(fēng)效率降低,通風(fēng)效果達(dá)不到預(yù)期效果。論文先就洞口污染物擴(kuò)散問(wèn)題,對(duì)國(guó)內(nèi)外研究現(xiàn)狀作出綜述,了解到數(shù)值模擬方法在該領(lǐng)域的普遍性,也發(fā)現(xiàn)目前大多數(shù)研究都是洞口擴(kuò)散、單洞毗鄰隧道竄流以及雙洞橫向竄流,而在雙洞毗鄰隧道的竄流問(wèn)題上缺乏研究。本文從試驗(yàn)數(shù)據(jù)出發(fā),在對(duì)數(shù)值模擬方法進(jìn)行驗(yàn)證后,確定了采用FLUENT軟件對(duì)問(wèn)題進(jìn)行模擬研究的研究方法。針對(duì)縱向通風(fēng)下的雙洞毗鄰隧道,本文制定了洞口竄流評(píng)價(jià)方案,并從貼附射流的角度,分析洞口排出的污染物的擴(kuò)散特征。本文先是在四段隧道通風(fēng)風(fēng)速相等的前提下,模擬了通風(fēng)風(fēng)速、隧道間距、環(huán)境風(fēng)等主要因素對(duì)洞口竄流的影響規(guī)律,得出結(jié)論,在無(wú)環(huán)境風(fēng)影響時(shí),洞口竄流與通風(fēng)風(fēng)速大小無(wú)關(guān),只與隧道間距有關(guān),而有環(huán)境風(fēng)時(shí),環(huán)境風(fēng)風(fēng)速和風(fēng)向都對(duì)竄流產(chǎn)生影響。然后模擬了單一排風(fēng)風(fēng)速和進(jìn)風(fēng)風(fēng)速對(duì)竄流的影響,以及一些特殊工況下的洞口竄流規(guī)律。繼續(xù)探討了改善洞口竄流的措施,指出目前常見(jiàn)的加筑隔墻和修建明洞兩種方案并不適用于雙洞毗鄰隧道,在此基礎(chǔ)上提出在明洞頂設(shè)排風(fēng)天窗這一可行的方案并驗(yàn)證了其可行性。
[Abstract]:With the continuous development of highways into mountainous areas, the construction of tunnels and tunnel groups has become a key project that needs to be tackled. In addition, in order to make better use of the traffic wind generated by the driving of vehicles, Two-hole one-way tunnel has become a common form of tunnel, and longitudinal ventilation has become the most commonly used tunnel ventilation mode. For the adjacent tunnel adjacent to the upstream and downstream two holes, the pollutants emitted from the exhaust tunnel will pollute the environment outside the tunnel. At the same time, there is "secondary pollution" caused by the channeling flow into the inlet tunnel. The existence of the channeling problem will reduce the ventilation efficiency of the tunnel with channeling flow, and the ventilation effect will not reach the expected effect. In this paper, first of all, the problem of pollutant diffusion at the entrance of the tunnel is discussed. This paper summarizes the present research situation at home and abroad, and finds out the universality of numerical simulation methods in this field. It is also found that most of the current researches are on the diffusion of holes, the channeling flow in the tunnel adjacent to a single hole and the transverse channeling in two holes. However, there is a lack of research on the problem of channeling in a tunnel adjacent to a double-hole. Based on the experimental data, the numerical simulation method is verified in this paper. The research method of simulating the problem by using FLUENT software is determined. Aiming at the tunnel adjacent to double holes under longitudinal ventilation, the evaluation scheme of channeling flow at the entrance of the tunnel is established, and from the point of view of the attached jet, Based on the analysis of the diffusive characteristics of pollutants discharged from the tunnel entrance, this paper first simulates the influence of the main factors, such as ventilation velocity, tunnel spacing and environmental wind, on the channeling flow of the tunnel under the premise of equal ventilation wind speed in the four sections of the tunnel, and draws a conclusion. When there is no influence of ambient wind, the channeling flow of the tunnel is independent of the wind speed of ventilation, and it is only related to the distance between tunnels, and when there is ambient wind, The influence of single exhaust wind speed and inlet wind speed on the channeling flow is simulated, as well as the channeling law of the tunnel under some special working conditions. The measures to improve the channeling flow are discussed. It is pointed out that the two schemes of adding partition wall and building open hole are not suitable for the tunnel adjacent to the double hole at present. On the basis of this, the feasible scheme of setting ventilation skylight on the roof of the tunnel is put forward and its feasibility is verified.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：U453.5

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