摘要
研究目的:广通4号隧道为泛亚铁路西线广通-大理铁路的重点工程。隧道施工至黄家阱断层时,隧底有大量有毒有害气体冒出,严重威胁施工安全。本文通过地质调查、取样、测试和室内试验等手段,结合隧址区地质环境特征,分析研究有毒有害气体的成分、成因、来源、分布特征和储集特性,并评价其危害性,以期为工程防治提供较准确的地质科学依据。研究结论:(1)隧址区为基底-盖层结构,基底发育有楚雄-建水张性断裂,上部盖层为基关-双柏穹窿褶皱区,有利于沿断裂带运移上升气体的聚集存储;(2)广通4号隧道有害气体成分主要为二氧化碳和二氧化硫,含量均已超过规范上限值,对人体健康有严重危害;(3)隧道内有害气体主要来源于深部的壳幔地层,为无机成因气,其高浓度二氧化碳的δ^(13)C_(CO2)含量介于3.1‰～4. 2‰之间;(4)本研究成果对类似工程地质环境条件下地下工程有害气体的防治具有一定借鉴意义。
Research purposes: The No. 4 Guangtong tunnel is the key project of Guangtong-Dali railway, which is one of the parts of western line project of Pan-Asian Railway. When the tunnel were under construction to the position of Huangjiajing fault, there were a lot of toxic and harmful gases coming out of the bottom of tunnel, which seriously threat to the construction safety. Based on the methods of survey, sampling, test, and laboratory test, the geological environment characteristics of the tunnel site, and the composition, origin, source, distribution and storage characteristics of toxic and harmful gases were analyzed, and its harmfulness were evaluated, to provide accurate geological data for the engineering prevention and control.Research conclusions :(1) The tunnel site had the characteristics of base-caprock structure, the bottom of tunnel developed the Chuxiong-Jianshui tensional fracture, and the upper cover was the Jiguan-Shuangbai dome fold area,this structure were favorable for the transport upward along the fault zone and accumulation of gas.(2) The component of harmful gases in the No. 4 Guangtong tunnel were mainly carbon dioxide and sulfur dioxide, their content exceeded the upper limit of the standard, and were harmful seriously to human health.(3) The harmful gases were the inorganic matter genetic gas in this tunnel, which mainly comes from deep crust and mantle strata, the high concentration of carbon dioxide of δ13CCO2 was between 3.1 and 4. 2 per thousand.(4) The research results have some reference value to the prevention and control of harmful gas of underground engineering under similar engineering geological environment.
作者
张雨露
丁文富
宋章
王朋
ZHANG Yu-lu;DING Wen-fu;SONG Zhang;WANG Peng(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)
出处
《铁道工程学报》
EI
北大核心
2018年第12期56-61,共6页
Journal of Railway Engineering Society
关键词
隧道
有害气体
成因
危害
防治对策
tunnel
harmful gas
origin
harm
prevention and control countermeasures
