瓦斯突出大断面隧道抽放参数确定与抽放效果评估研究  

The Determination of Gas Draining Parameters and the Evaluation of Gas Draining Effect for a Gas-Outbursting Tunnel with a Large Cross-Section

作　　者：袁旺小[1] YUAN Wangxiao(The 18th Bureau Group of China Railway,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《国防交通工程与技术》2019年第3期68-72,50,共6页Traffic Engineering and Technology for National Defence

摘　　要：为了获取铁路双线大断面隧道石门揭煤防突抽放瓦斯的合理参数,在对隧道穿越地层岩性、地质构造和煤层特殊地质进行充分认识的基础上,分析了影响瓦斯抽放效果的影响因素,确定了符合本项目瓦斯抽放参数:排放范围、钻孔直径、排放半径、抽放时间、封孔长度等,并将数值结果应用于指导现场施工,取得了预期的效果。In order to obtain the reasonable parameters of gas draining to prevent gas-outbursting for the large-cross-section tunnel of a railway double line at Shimen, upon the basis of a full understanding of the properties of the strata, the geological formation and the special geological properties of the coal stratum through which the tunnel goes, analyzed in the present paper are the influential factors that affect the gas-draining effect, with the gas-draining parameters suitable for the project determined, which include the draining range, the diameters of drilled holes, the discharging radius,the draining duration, the length of the sealed holes and the like. In addition, the numerical results are applied to guiding the site construction, with the expected effects achieved.

关 键 词：瓦斯突出 大断面隧道 瓦斯抽放 抽放参数 抽放效果 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]