成都地铁30号线浅层天然气分布特征及危害研究  

Study on the Distribution Characteristics and Hazards of Shallow Natural Gas in Chengdu Metro Line 30

作　　者：汪意凌 苏培东[1] 张升文 何川 李有贵 Wang Yiling;Su Peidong;Zhang Shengwen;He Chuan;Li Yougui(School of Earth Science and Technology,Southwest Petroleum University,Chengdu 610000,China;CREEC(Chengdu)Construction and Development Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610000 [2]中铁二院(成都)建设发展有限责任公司,四川成都610031

出　　处：《市政技术》2023年第5期164-169,194,共7页Journal of Municipal Technology

摘　　要：浅层天然气的存在对成都市多条地铁线路都造成了威胁,且其分布规律难以准确探明和预测,是地铁施工的高风险源和研究难点。因此,依托成都地铁30号线星月站—光明站区间,通过资料收集、现场测试与室内试验,研究了浅层天然气特征和危害分区。研究表明:浅层天然气主要成分为甲烷,为深部天然气沿双流隐伏断层向上运移,在浅部白垩系地层节理裂隙发育处缓慢聚集而成;研究区浅层天然气质量浓度在平面上呈中段高、两端低,纵向上随着地层深度的增加,质量浓度呈增加趋势;星月站—光明站区间为高浅层天然气隧道,其中ZDK13+868—ZDK13+949段为高浅层天然气区段,ZDK13+949—ZDK14+030段为低浅层天然气区段,可通过研究对该区段进行浅层天然气危险等级分区,以便优化地铁隧道工程勘察流程。The existence of shallow natural gas poses a threat to many metro lines in Chengdu.Its distribution pattern is difficult to be accurately detected and predicted,which is a high risk source and a difficult research point for metro construction.Based on the interval between Xing Yue Station and Guangming Station of Chengdu Metro Line 30,the characteristics and hazard zoning of shallow natural gas were studied by data collection,field tests and indoor trials.The study shows that the main component of shallow natural gas is methane,which is transported upward along the dual-flow buried fault from the deeper part of the natural gas and gathered slowly at the joint fracture development of the shallow Cretaceous strata;The mass concentration of shallow natural gas in the study area is high in the middle section and low at both ends,and increases with the increase of stratigraphic depth in the longitudinal direction;The interval between Xingyue Station and Guangming Station is a tunnel with high gas content.The section of ZDK13+868—ZDK13+949 is a high gas working area,and the section ZDK13+949—ZDK14+030 is a low gas working area,which can be studied gas hazard level zoning to optimize the survey process of metro tunnel engineering.

关 键 词：地铁隧道 浅层天然气 分布特征 危害分区 

分 类 号：U458[建筑科学—桥梁与隧道工程] P618.13[交通运输工程—道路与铁道工程]