铁路瓦斯隧道等级划分方法研究  

Research on the Classification Method of Railway Gas Tunnel

作　　者：匡亮[1] 张俊云[2] 张振强[2] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]西南交通大学,成都610031

出　　处：《铁道工程学报》2017年第8期73-77,共5页Journal of Railway Engineering Society

基　　金：中国中铁股份有限公司科研项目(重点-40-2010)

摘　　要：研究目的:目前规范以绝对瓦斯涌出量0.5 m3/min作为铁路隧道高、低瓦斯等级界限值,如今随着高速、大断面铁路瓦斯隧道的不断涌现,施工通风方式和工艺已发生很大变化,这种分类方法不能完全适用于大断面瓦斯隧道,将增加不必要的设备投入及工程措施,造成投资浪费。本文通过分析国内外矿井、公路及铁路隧道的瓦斯等级划分,结合隧道断面面积、需风量和瓦斯浓度等影响指标提出铁路瓦斯隧道等级划分标准,从而满足瓦斯隧道设计与施工的使用。研究结论:(1)根据安全瓦斯浓度,并结合隧道断面大小和通风要求提出了铁路瓦斯隧道等级划分方法,据此对成贵铁路瓦斯隧道进行分级,分级结果可减少工程投资,加快施工进度;(2)提出了微瓦斯隧道,明确低瓦斯与高瓦斯的浓度分界值为0.3%,微瓦斯与低瓦斯的浓度分界值为0.1%;(3)按断面面积将铁路隧道分为Ⅰ类(30~70 m^2)、Ⅱ类(70~110 m^2)、Ⅲ类(110~140 m^2)和Ⅳ类(≥140 m^2);(4)提出了用于瓦斯隧道分级的临界通风量计算方法,低瓦斯与微瓦斯临界通风量按0.15 m/s乘以隧道面积计算,低瓦斯与高瓦斯临界通风量按0.2 m/s乘以隧道面积计算;(5)本研究成果可为铁路瓦斯隧道设计和施工提供借鉴。Research purposes： At present, 0.5 m3/min is used as the high and low gas level tunnel as the absolute gas emission. Nowadays, with the rapid development of high -speed and tunnel, the ventilation mode and process of construction have great changes, this classification limit value of the railway large section railway gas method can not be fully applicable to the large section of gas tunnel, it will increase the equipment investment and engineering measures, and result in a waste of investment. A suitable classification method for various section railway gas tunnel was put forward by means of analysis of gas grade classification principle and method of mine and traffic gas tunnel, combined with railway tunnel cross section size, air flow and gas concentration index to meet the use of gas tunnel design and construction. Research conclusions： （ 1 ） According to the safety of gas concentration, and combined with the section size of tunnel and ventilation, railway gas tunnel classification method is proposed. Accordingly, the gas grading of Chengdu - Guiyang railway line for passenger traffic were classified, the results can reduce the engineering investment, accelerate the construction progress. （2） The concept of micro - gas tunnel was put forward, the boundary value of the concentration of micro gas and low gas tunnel is 0.1%, and the boundary value of the low gas and high gas tunnel is 0.3 %. （ 3 ） On the basis of the excavation area, railway tunnel is divided into four levels： class Ⅰ （30 ～70 m2） ,class Ⅱ （70 ～ 110 m2）, class m （110 - 140 m2） and class Ⅳ （ ≥ 140 m2）. （4） The suitable calculation method of gas tunnel classification for amount of wind was put forward, the boundary required air volume of micro gas and low gas was calculated by 0. 15 m/s multiplied by the basal area, the boundary required air volume of low gas and high gas tunnel was calculated by 0.2 m/s multiplied by the basal area. （5） The research results can provide a reference for the design

关 键 词：铁路瓦斯隧道 瓦斯等级 需风量 瓦斯浓度 

分 类 号：U25[交通运输工程—道路与铁道工程]