特长铁路瓦斯隧道施工通风优化及安全控制技术研究

发布时间：2018-02-28 05:33

本文关键词： 特长铁路隧道施工通风瓦斯扩散方案优化风室接力安全控制技术　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：在国家"一带一路"政策的带动下,铁路、公路的建设进入了高速、全面发展的阶段。大量工程实践表明,穿越煤系及非煤系的特长瓦斯铁路隧道面临严峻的长距离施工通风问题及瓦斯溢出的突发灾害安全问题。论文以营盘山特长瓦斯铁路隧道为工程依托,结合计算流体力学理论,围绕特长铁路瓦斯隧道长距离多工作面施工通风问题展开系统研究;基于FLUENT三维数值模拟以及现场测试研究方法,对施工过程中的风流流场、瓦斯运移扩散规律以及污染物排出效果进行研究,并针对研究结果提出施工通风安全控制技术措施及工程应用。本文主要研究成果如下:1.根据营盘山特长瓦斯铁路隧道特点,结合理论分析,提出不同阶段长距离隧道施工通风方案,确定了第一阶段采用独头压入式通风,待横通道打通后,第二阶段3个斜井工区采用风室接力的通风模式,进口工区及出口工区采用巷道式通风的施工通风方式,降低了通风成本,提高了施工效率。2.基于对营盘山隧道通风流场数值模拟分析,探明了附壁射流流动、瓦斯运移扩散规律,得出通风效率降低区域以及瓦斯易聚集区域,提出风室接力+巷道式通风方案通风效率高于压入式通风效率。3.对营盘山隧道瓦斯通风进行了现场测试,根据现场测试方案对隧道内风速及瓦斯浓度测试数据进行了分析,得出了瓦斯浓度变化规律及其影响因素,确定了现场通风方案能够满足通风要求。并将测试结果与数值模拟结果进行对比,得出二者相关性较好,验证了数值模拟的正确性。4.基于FLUENT三维数值模拟以及现场测试结果,结合营盘山特长瓦斯铁路隧道实际情况,提出使用瓦斯自动监控预警系统与施工通风技术措施、通风管理措施相结合的瓦斯隧道施工通风安全控制技术。
[Abstract]:Driven by the national "Belt and Road" policy, the construction of railways and highways has entered a stage of high speed and all-round development. A large number of engineering practices have shown that. The tunnel of extra-long gas railway passing through coal measure and non-coal measure is faced with severe problems of ventilation in long distance construction and safety of gas overflow. Based on Yingpanshan extra long gas railway tunnel and combined with computational fluid mechanics theory, the paper takes Yingpanshan extra long gas railway tunnel as engineering support. Based on the three-dimensional numerical simulation of FLUENT and the field test method, the wind flow field in the construction process is studied systematically around the ventilation problem in the long distance and multi-face construction of the gas tunnel of the super-long railway. The law of gas migration and diffusion and the effect of pollutant discharge are studied, and the technical measures and engineering application of construction ventilation safety control are put forward according to the research results. The main research results of this paper are as follows: 1. According to the characteristics of Yingpanshan extra long gas railway tunnel, Combined with theoretical analysis, the ventilation scheme of long distance tunnel construction in different stages is put forward, and the ventilation mode of air chamber relay is determined in the first stage, after the opening of the horizontal passage, and in the second stage, the ventilation mode of air chamber relay is adopted in the three inclined shaft working areas. The construction ventilation mode of roadway ventilation is adopted in the imported and outlet working areas, which reduces the ventilation cost and improves the construction efficiency .2.Based on the numerical simulation analysis of ventilation flow field in Yingpanshan Tunnel, the wall attached jet flow is proved. According to the law of gas migration and diffusion, the area where ventilation efficiency is reduced and the area where gas is easily accumulated, the ventilation efficiency of relay tunnel ventilation scheme in air chamber is higher than that of pressure-in ventilation efficiency .3.The field test of gas ventilation in Yingpanshan tunnel is carried out. According to the field test scheme, the test data of wind speed and gas concentration in tunnel are analyzed, and the variation law of gas concentration and its influencing factors are obtained. It is determined that the on-site ventilation scheme can meet the ventilation requirements, and the test results are compared with the numerical simulation results, and the correlation between the two results is good, which verifies the correctness of the numerical simulation. 4. Based on the three-dimensional numerical simulation of FLUENT and the field test results, Combined with the actual situation of Yingpanshan extra-long gas railway tunnel, this paper puts forward the safety control technology of gas tunnel construction ventilation by using automatic monitoring and warning system of gas, ventilation technical measures of construction and ventilation management measures.
【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】：U453.5

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