青海西宁-民和盆地二氧化碳气藏研究及隧道危险性分区评价  

Study on CO_(2) reservoir and risk zoning evaluation of the tunnel in Xining-Minhe Basin,Qinghai

作　　者：艾秀峰 AI Xiufeng(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,Shaanxi,China;Shaanxi Railway and Underground Traffic Engineering Key Laboratory(FSDI),Xi′an 710043,Shaanxi,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043 [2]陕西省铁道及地下交通工程重点实验室(中铁一院),陕西西安710043

出　　处：《矿产与地质》2021年第1期154-162,共9页Mineral Resources and Geology

基　　金：中铁第一勘察设计院集团有限公司科研项目(院科19-08)资助。

摘　　要：新建西宁至成都铁路海东南山隧道地表钻探过程中发生高压气体突出事件,严重威胁工程安全。在分析区域地质环境的基础上,结合地表调查、钻探、室内试验及地表通量测试等综合勘察手段,研究区域气体的成因机制和运移模式,评价重点地区隧道危险性,指导线路选线、设计、施工。研究结果表明:区域气体成分主要为CO_(2),属无机成因,以水溶离子相、水溶气相、连续气相赋存于地层裂隙,通过断裂运移;规划的越岭隧道方案部分区域存在揭露气体甚至形成高压气体的可能,工程通过应采取相应措施,预防CO_(2)气体灾害发生。The outburst of high pressure gas occurred during the surface drilling process in the newly built Xining-Chengdu railway Haidongnanshan tunnel,which is a seriously threat to the safety of the project.Based on the analysis of regional and geological environment,with the combination of surface investigation,drilling,indoor experiment and surface flux measurement,the genetic mechanism and migration mode of regional gas is studied,the risk of tunnels in key areas is evaluated in order to guide the route selection,design and construction.The result shows that the main component of regional gas is CO_(2),which belongs to inorganic origin.It is hosted in stratum fractures in water-soluble ion phase,water-soluble gas phase,and continuous gas phase,and migrates through the faults.It is possible to expose gas or even high pressure gas in some areas of the planned Cross Ridge tunnel scheme.Corresponding measures should be taken to prevent the occurrence of CO_(2) gas disaster.

关 键 词：铁路隧道 CO_(2)气体 成因 危险性分区 西宁—民和盆地 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]