贵南高铁朝阳隧道出口平导6.10突水突泥事件分析  

Analysis of 6.10 water and mud inrush incident in the exit of parallel pilot tunnel of Chaoyang tunnel of Guiyang-Nanning high-speed railway

作　　者：付开隆[1] 周羽 韦正雄 FU Kailong;ZHOU Yu;WEI Zhengxiong(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《中国岩溶》2022年第6期895-904,共10页Carsologica Sinica

摘　　要：2018年6月10日,朝阳隧道出口平导发生岩溶突水突泥,持续时间约1 h,突水突泥总量约1.6×10^(6) m^(3)。为完善施工掘进方案及排水方案,需分析突水突泥产生原因,评价后续施工带来的突水突泥风险,计算隧道涌水量。文章分析了隧道位置的地形地貌、工程地质、水文地质条件,阐述了发生突水突泥的平导掌子面超前地质预报实施情况及突水突泥发生过程,补充调查了灾害影响范围的工程地质、水文地质条件,完成了长达1年的平导涌水量-降雨量关系动态观测。平导突水突泥掌子面前方有水头高达84 m的巨型溶腔及管道系统,施工开挖揭穿溶腔底部后,填充于整个岩溶水系统的有压水流携带泥砂快速涌入平导并以较大动能冲出洞外,导致了6.10突水突泥事件的发生。隧道出口段岩溶水系统接受降雨入渗补给且径流通畅,洞内涌水对应的汇水面积为6.423 km^(2),计算极端暴雨后平导最大涌水量5×10^(4)m^(3)·h^(-1)。突水突泥发生后山体内的静储量已得到充分释放,地下水位已降至平导底板高程,后续施工中再遭遇突水突泥的风险低。A high-speed railway running 350 km·h-1is being built between Guiyang in Guizhou Province and Nanning in Guangxi. Chaoyang tunnel is a double-track single-hole tunnel located in southeastern Guizhou. The tunnel clearance is 100 m~2 with the total length of 12,734 m(including more than 7-km-long soluble rock), and its maximum burial depth is 386 m. The railroad track elevation of the tunnel is 782-468 m, and it gradually decreases from the entrance to the exit, with a slope of-22.7‰ to-25‰. An auxiliary tunnel scheme of "2 transverse tunnels +2 parallel pilot tunnels +1 inclined shaft" has been adopted, with the parallel pilot tunnel on the left side of the main tunnel. The midline of the parallel pilot tunnel is 30 m away from the main tunnel, and 3 m lower than the main hole. The inner headroom size is 5.0 m(width) ×6.0 m(height).Construction of the tunnel began in early 2016 and will be completed in 2022. On June 10, 2018, karst water and mud inrush, lasting about 1 hour, occurred at the exit of parallel pilot tunnel of Chaoyang tunnel. The total amount of water and mud inrush was about 1.6×10^(6) m^(3). In order to complete the construction tunneling scheme and drainage scheme, it is necessary to analyze the causes of water and mud inrush, evaluate its risk in the subsequent construction,and calculate the water inflow of the tunnel. In this study area, the exit section of the tunnel is in the sloping mediumand-low mountainous area, belonging to the karst peak cluster landform, and the terrain fluctuates greatly. The tunnel passes th exit section of the tunnel is in the sloping medium and low mountainous area, belongs to the karst peak cluster landform with relatively sharp topographic relief. The tunnel passes through a regionally wide and gentle symmetrical anticline, and the exit of the tunnel is located on the southeastern wing of the anticline widely distributed by thick-to-extremely-thick bedded limestone with pure rock texture. Extreme development of surface karst funnels,dissolution basins, karst

关 键 词：突水突泥 溶腔 暗河 原因分析 涌水量 朝阳隧道 

分 类 号：U453[建筑科学—桥梁与隧道工程]