下穿河流的输气隧道渗流安全性评价  

Seepage safety evaluation of gas transmission tunnel undercrossing the river

作　　者：荆少东[1] 张彬[2] 樊东生 刘晓忠[3] 李志华[3] 刘乾灵 刘康能 JING Shaodong;ZHANG Bin;FAN Dongsheng;LIU Xiaozhong;LI Zhihua;LIU Qianling;LIU Kangneng(College of Environmental Science and Engineering,Ocean University of China;School of Engineering and Technology,China University of Geosciences(Beijing);SINOPEC Petroleum Engineering Corporation)

机构地区：[1]中国海洋大学环境科学与工程学院 [2]中国地质大学(北京)工程技术学院 [3]中石化石油工程设计有限公司

出　　处：《油气储运》2023年第3期291-297,共7页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金资助项目“海岛潮汐环境下地下油库水幕系统协同作用机理与水封效率优化”,41972300;国家自然科学基金资助项目“地下油库结晶岩体裂隙流固耦合特征及水封条件研究”,40902086。

摘　　要：输气隧道安全性关系到输气管道的长期安全运行,对于下穿河流隧道,其渗流安全性至关重要。建立全尺度的三维数值模型,对川气东送某工程嘉陵江隧道穿越进行渗流特征分析及涌水量评价。通过分析研究区工程地质条件,获得场地岩体渗透性分布特征以及断层破碎带等渗流通道的渗透系数特征。根据水文地质特征,考虑地下水系统的完整性和独立性,确定数值模型边界范围。数值模拟结果表明,断层破碎带处渗透性明显增大,为主要涌水段;断层注浆可有效降低涌水量,提升隧道开挖期间安全性。研究结果可为类似下穿河流隧道提供借鉴和参考。The safety of gas transmission tunnel is very important for the long-term safe operation of gas transmission pipelines,and the seepage safety is very critical for the tunnel undercrossing the river.In this paper,the seepage characteristics were analyzed for a tunnel in Sichuan-to-East Gas Pipeline crossing Jialing River by establishing a full-scale three-dimensional numerical model,and the water inflow was assessed accordingly.Firstly,the permeability distribution characteristics of the site rock mass and the permeability coefficient characteristics of the seepage channels such as the fault fracture zone were obtained by analyzing the engineering geological conditions of the study area.Then,the boundary range of numerical model was determined with consideration to the integrity and independence of groundwater system according to the hydrogeological characteristics.The numerical simulation results show that the fault fracture zone is the main water inflow section with the permeability increasing significantly.Thus,fault grouting could effectively reduce the water inflow and improve the safety of tunnel excavation.Generally,the research results could providea a reference for similar tunnels undercrossing the river.

关 键 词：天然气管道 河流穿越段隧道 渗流特征 涌水量评价 数值模拟 

分 类 号：TE88[石油与天然气工程—油气储运工程]