隧道建设
隧道建設
수도건설
TUNNEL CONSTRUCTION
2012年
1期
66-71
,共6页
新凉风垭隧道%倾斜煤层%瓦斯突出%瓦斯排放%通风系统
新涼風埡隧道%傾斜煤層%瓦斯突齣%瓦斯排放%通風繫統
신량풍오수도%경사매층%와사돌출%와사배방%통풍계통
New Liangfengya tunnel%inclined coal seam%gas outburst%gas discharge%ventilation system
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。
為選擇安全有效的瓦斯排放措施,降低瓦斯壓力對瓦斯突齣隧道的影響,針對隧道穿越多層距離較近的傾斜突齣煤層,以改建鐵路重慶至貴暘擴能改造工程新涼風埡隧道為揹景,採用對比分析法,研究分析瞭3種瓦斯排放設計。綜閤攷慮施工便利程度、通風及隧道襯砌結構穩定性等因素,確定瞭新涼風埡隧道在穿越煤繫地層地段距離較近的K7,K8和K9 3層煤時,採用排放方式1（即在垂直掌子麵上打排放孔的方式進行排放,K8,K9 2層煤1次排放,再單獨排放K7煤層,排放孔佈置形式為矩形行列結構）,此方式適閤穿越多層距離較近的傾斜突齣煤層的瓦斯排放。
위선택안전유효적와사배방조시,강저와사압력대와사돌출수도적영향,침대수도천월다층거리교근적경사돌출매층,이개건철로중경지귀양확능개조공정신량풍오수도위배경,채용대비분석법,연구분석료3충와사배방설계。종합고필시공편리정도、통풍급수도츤체결구은정성등인소,학정료신량풍오수도재천월매계지층지단거리교근적K7,K8화K9 3층매시,채용배방방식1（즉재수직장자면상타배방공적방식진행배방,K8,K9 2층매1차배방,재단독배방K7매층,배방공포치형식위구형행렬결구）,차방식괄합천월다층거리교근적경사돌출매층적와사배방。
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.
