本文選題：隧道工程 + 防火及降噪�。� 參考：《河北工業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著隧道長度、交通密度的增加,隧道發(fā)生火災(zāi)的潛在威脅在增大,噪音污染也日漸嚴重。專門針對長大隧道防火和降噪兩個方面進行研究,主要內(nèi)容見以下幾個方面:1.通過模擬火災(zāi)現(xiàn)場材料表面實際升溫曲線,分析了混凝土過火性能影響的三個主要因素(含濕量、強度、骨料),研究結(jié)果顯示:混凝土受火后的質(zhì)量損失隨著含濕量的升高而增大,含濕量越高,混凝土爆裂越嚴重;對于混凝土強度等級來說,隨著強度的提高,混凝土耐火性變差,質(zhì)量損失變大;不同骨料混凝土,熱穩(wěn)定性越好的碎石混凝土抗爆裂能力越強,耐火性從好到壞排列順序為:花崗巖碎石混凝土、玄武巖碎石混凝土、石灰?guī)r碎石混凝土。2.為了提高二襯混凝土的過火性能,采取了一系列措施。將臨界含濕量作為混凝土抗爆裂的一個評價指標(biāo)進行測試,得出防火纖維混凝土爆裂的臨界含濕量為79%,均高于其它三種混凝土,抗爆裂性能最好;另外,通過對不同摻量防火纖維混凝土進行過火試驗,可以看出,隨著纖維摻量的增多,混凝土過火后損傷程度降低;對防火纖維混凝土進行抗?jié)B性測試,得出防火纖維混凝土較普通混凝土抗?jié)B性略有降低;在防火纖維混凝土中摻加粉煤灰,較大程度的提高了混凝土的抗?jié)B性。3.通過測試不同混凝土板側(cè)面溫度場以及區(qū)域回彈值,可知不同混凝土板側(cè)面溫度場基本一致,同一溫度場剩余回彈值相差不大,基本呈現(xiàn)隨溫度的增加,回彈損失值增大的趨勢。4.隧道降噪方面,通過對市面上幾種常用的吸聲材料進行吸聲系數(shù)測試,試驗結(jié)果顯示,在保證平均吸聲系數(shù)具有高效能力的基礎(chǔ)上,考慮不同頻段的吸聲效果以及隧道施工的方便性、經(jīng)濟性,初步選取30mm厚無機纖維涂料用于隧道二襯混凝土。5.通過對不同級配不同砂率的露石水泥混凝土進行抗滑、耐磨等使用性能研究,結(jié)果表明:砂率為20%,粒徑4.75~9.5mm與9.5~13.2mm的集料比例為2:1時,路用性能最好。此配比下的露石水泥混凝土在保證耐磨的前提下,大大提高了路面的抗滑性能,吸聲系數(shù)也比普通混凝土提高了一倍左右。
[Abstract]:With the increase of tunnel length and traffic density, the potential threat of tunnel fire is increasing, and the noise pollution is becoming more and more serious. Specifically for the long tunnel fire prevention and noise reduction two aspects of the study, the main content of the following several aspects: 1. By simulating the actual heating curve of the material surface in the fire site, three main factors (moisture content, strength) affecting the overfire performance of concrete are analyzed. The research results show that the mass loss of concrete after fire increases with the increase of moisture content, the higher the moisture content, the more serious the concrete burst; for the strength grade of concrete, with the increase of strength, the fire resistance of concrete becomes worse. The better the thermal stability of aggregate concrete is, the stronger the burst resistance of crushed stone concrete is. The order of fire resistance from good to bad is: granite crushed stone concrete, basalt crushed stone concrete, limestone stone crushed stone concrete. The order of fire resistance is: granite crushed stone concrete, basalt crushed stone concrete, limestone crushed stone concrete. A series of measures have been taken to improve the over-fire performance of second-lining concrete. Using critical moisture content as an evaluation index of concrete crack resistance, it is concluded that the critical moisture content of fire-resistant fiber concrete is 79, which is higher than the other three kinds of concrete, and the crack resistance is the best. Through the overfire test of fire-resistant fiber concrete with different content, it can be seen that with the increase of fiber content, the damage degree of concrete after overfire is reduced, and the impermeability of fire-resistant fiber concrete is tested. It is concluded that the impermeability of fire-resistant fiber concrete is slightly lower than that of ordinary concrete, and the anti-permeability of concrete is greatly improved by adding fly ash to the anti-fire fiber concrete. By measuring the temperature field and the regional rebound value of different concrete slabs, it can be seen that the temperature field of different concrete slabs is basically the same, and the residual springback value of the same temperature field is not different, and the residual springback value of the same temperature field is basically increased with the increase of temperature. Springback loss value increase trend. 4. In the aspect of tunnel noise reduction, the sound absorption coefficient of several commonly used sound absorption materials in the market is tested. The experimental results show that, on the basis of ensuring that the average sound absorption coefficient has high efficiency, Considering the sound absorption effect of different frequency bands, the convenience and economy of tunnel construction, the 30mm thick inorganic fiber coating was preliminarily selected for the second lining concrete. 5. In this paper, the anti-sliding and wear-resisting properties of the concrete with different gradation and different sand ratio are studied. The results show that the road performance is the best when the sand ratio is 20 and the aggregate ratio of 4.75~9.5mm to 9.5~13.2mm is 2:1. On the premise of ensuring wear resistance, the anti-slip performance of the concrete under this ratio is greatly improved, and the sound absorption coefficient of the concrete is about twice as high as that of the ordinary concrete.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U458

【參考文獻】

相關(guān)期刊論文 前1條

1 席鶯,李旭祥,方志剛,茅素芬;聚氯乙烯基混合吸聲材料的研究[J];高分子材料科學(xué)與工程;2001年02期

，

本文編號：1932921