【摘要】：成蘭鐵路起于成都市,經(jīng)廣漢、什邡、茂縣和九寨溝,最終到達(dá)蘭州市,總長度為727公里,客貨共線,屬于國鐵I級雙線電氣化快速鐵路。躍龍門隧道屬于成蘭鐵路上的重點工程,前接高川車站,后接羊記溝大橋,采用雙線分修,最大線間距60m,最小線間距30m。2014年12月20日,在躍龍門隧道的施工過程中,施工人員出現(xiàn)頭暈,惡心,鼻、眼、喉嚨呼吸道不適等現(xiàn)象。經(jīng)鑒定,躍龍門隧道出現(xiàn)硫化氫氣體,且根據(jù)現(xiàn)行《煤礦安全規(guī)程》,硫化氫在空氣中的最高允許濃度為6.6ppm,參照此標(biāo)準(zhǔn),躍龍門隧道硫化氫涌出量嚴(yán)重超標(biāo)。若不及時應(yīng)對,將會給隧道施工安全、施工進(jìn)度及后期運(yùn)營帶來巨大影響�；谶@一情況,本文通過現(xiàn)場踏勘、室內(nèi)試驗及區(qū)域地質(zhì)調(diào)查等方法對躍龍門隧道硫化氫氣體的賦存特征進(jìn)行了分析,以C#為編程語言對隧道硫化氫氣體絕對涌出量進(jìn)行了計算,最后以數(shù)值模擬方法作為理論支撐,建立起躍龍門隧道三維模型,通過FLUENT軟件對躍龍門隧道硫化氫氣體的逸出及擴(kuò)散情況進(jìn)行模擬,并對模擬結(jié)果分析,結(jié)合施工實際情況,提出躍龍門隧道安全預(yù)警機(jī)制,為施工危害防治提出理論依據(jù)。研究表明,在特殊的地層巖性,特殊的金屬含礦異常帶、區(qū)域性褶皺斷裂組合情況下,含硫地層物質(zhì)在硫酸鹽熱化學(xué)還原情況下,產(chǎn)生硫化氫,并向上飄逸遇水溶解于地下水中,隨地下水運(yùn)移,在隧道開挖后,由于圍巖體及地下水場受到擾動,破環(huán)了硫化氫存在的狀態(tài)和硫化礦水解的原有平衡,硫化氫便會隨之涌出。在隧道通風(fēng)后,隧道內(nèi)硫化氫濃度明顯降低,且回風(fēng)巷下風(fēng)向的硫化氫氣體濃度明顯高于上風(fēng)向。
[Abstract]:The Cheng-Lan Railway, which started in Chengdu, reached Lanzhou City through Guanghan, Shifang, Maoxian and Jiuzhaigou. The total length is 727 kilometers. Yuelongmen Tunnel is a key project on Cheng-Lan Railway. It is connected with Gaochuan Station in front and Yangjigou Bridge in the rear. It is repaired separately with two lines, the maximum line spacing is 60m, and the minimum line spacing is 30m.2014. During the construction process of Yuelongmen Tunnel, Construction workers appear dizziness, nausea, nose, eyes, throat respiratory discomfort and other phenomena. According to the present coal mine safety regulations, the maximum allowable concentration of hydrogen sulfide in air is 6.6 ppm. according to this standard, hydrogen sulfide emission from Yuelongmen tunnel is seriously over the standard. If not, the tunnel construction safety, construction schedule and later operation will be greatly affected. Based on this situation, this paper analyzes the occurrence characteristics of hydrogen sulfide gas in Yuelongmen Tunnel by means of field exploration, laboratory test and regional geological survey. Taking C # as programming language, the absolute emission of hydrogen sulfide gas in tunnel is calculated. Finally, the three-dimensional model of Yueyue Longmen Tunnel is established with numerical simulation method as theoretical support. The escape and diffusion of hydrogen sulfide gas in Yuelongmen tunnel were simulated by FLUENT software, and the simulation results were analyzed. Combined with the actual construction situation, the safety early warning mechanism of Yuelongmen tunnel was put forward, which provided a theoretical basis for the prevention and control of construction hazards. The results show that, under the condition of special stratigraphic lithology, special metal ore bearing anomaly zone and regional fold and fault assemblage, the sulfide-bearing formation material produces hydrogen sulfide under the condition of sulphate thermochemical reduction. After tunnel excavation, the surrounding rock body and groundwater field were disturbed, which broke the existing state of hydrogen sulfide and the original equilibrium of sulphide hydrolysis, and the hydrogen sulfide would flow out with it. After the tunnel ventilation, the concentration of hydrogen sulfide in the tunnel decreases obviously, and the concentration of hydrogen sulfide gas in the wind direction under the return wind lane is obviously higher than that in the upper wind direction.
【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】：2017
【分類號】：U455.4

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