摘要
为选择安全有效的瓦斯排放措施,降低瓦斯压力对瓦斯突出隧道的影响,针对隧道穿越多层距离较近的倾斜突出煤层,以改建铁路重庆至贵阳扩能改造工程新凉风垭隧道为背景,采用对比分析法,研究分析了3种瓦斯排放设计。综合考虑施工便利程度、通风及隧道衬砌结构稳定性等因素,确定了新凉风垭隧道在穿越煤系地层地段距离较近的K7,K8和K9 3层煤时,采用排放方式1(即在垂直掌子面上打排放孔的方式进行排放,K8,K9 2层煤1次排放,再单独排放K7煤层,排放孔布置形式为矩形行列结构),此方式适合穿越多层距离较近的倾斜突出煤层的瓦斯排放。
New Liangfengya tunnel on Chongqing-Guiyang railway crosses closely-distributed K7,K8 and K9 coal seams.3 gas discharging design options are studied by means of comparative analysis.In the end,option 1 of the gas discharging design,i.e.,drilling discharging holes on the vertical tunnel face,implementing gas discharging for K8 and K9 coal seams in one operation before the gas discharging for K7 coal seam is performed,and the discharging holes being arranged in rectangular rows,is finally adopted,with the construction convenience,ventilation and lining stability considered.The adopted gas discharging design is suitable for the gas discharging of closely-distributed inclined coal seams prone to outburst.
出处
《隧道建设》
2012年第1期66-71,共6页
Tunnel Construction
关键词
新凉风垭隧道
倾斜煤层
瓦斯突出
瓦斯排放
通风系统
New Liangfengya tunnel
inclined coal seam
gas outburst
gas discharge
ventilation system
