成兰铁路跃龙门隧道硫化氢气体赋存特征与施工危害防治

发布时间：2018-10-09 12:48

【摘要】：成兰铁路起于成都市,经广汉、什邡、茂县和九寨沟,最终到达兰州市,总长度为727公里,客货共线,属于国铁I级双线电气化快速铁路。跃龙门隧道属于成兰铁路上的重点工程,前接高川车站,后接羊记沟大桥,采用双线分修,最大线间距60m,最小线间距30m。2014年12月20日,在跃龙门隧道的施工过程中,施工人员出现头晕,恶心,鼻、眼、喉咙呼吸道不适等现象。经鉴定,跃龙门隧道出现硫化氢气体,且根据现行《煤矿安全规程》,硫化氢在空气中的最高允许浓度为6.6ppm,参照此标准,跃龙门隧道硫化氢涌出量严重超标。若不及时应对,将会给隧道施工安全、施工进度及后期运营带来巨大影响。基于这一情况,本文通过现场踏勘、室内试验及区域地质调查等方法对跃龙门隧道硫化氢气体的赋存特征进行了分析,以C#为编程语言对隧道硫化氢气体绝对涌出量进行了计算,最后以数值模拟方法作为理论支撑,建立起跃龙门隧道三维模型,通过FLUENT软件对跃龙门隧道硫化氢气体的逸出及扩散情况进行模拟,并对模拟结果分析,结合施工实际情况,提出跃龙门隧道安全预警机制,为施工危害防治提出理论依据。研究表明,在特殊的地层岩性,特殊的金属含矿异常带、区域性褶皱断裂组合情况下,含硫地层物质在硫酸盐热化学还原情况下,产生硫化氢,并向上飘逸遇水溶解于地下水中,随地下水运移,在隧道开挖后,由于围岩体及地下水场受到扰动,破环了硫化氢存在的状态和硫化矿水解的原有平衡,硫化氢便会随之涌出。在隧道通风后,隧道内硫化氢浓度明显降低,且回风巷下风向的硫化氢气体浓度明显高于上风向。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4

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