军功特长隧道水文地质条件浅析及涌水量预测  

Analysis of the Hydrogeological Conditions of Jungong Super Long Tunnel and Prediction of Its Water Inflow

作　　者：库海林 范增顺 Ku Hailin;Fan Zengshun(Qinghai Geotechnical Engineering Survey Institute Co.,Ltd.,Xining 810008,China;Qinghai Nonferrous Geological and Mineral Exploration Bureau,Xining 810001,China)

机构地区：[1]青海岩土工程勘察院有限公司,西宁810008 [2]青海省有色地质矿产勘查局,西宁810001

出　　处：《青海科技》2024年第2期177-184,共8页Qinghai Science and Technology

摘　　要：G227线贵德至大武公路工程GDSC-2标段勘察项目军功特长隧道勘察工作于2022年5月结束。军功特长隧道全长12 km,所处区域大部分为高山区,海拔4000 m以上的地区广泛发育着岛状多年冻土。受高寒湿润气候的影响,蒸发作用相对微弱,大气降水(雨)较丰富,大量的降水直接沿裂隙、孔隙渗入地下形成冻结层水,水文地质条件中等。此次勘察布设洞身工程地质(兼水文地质)勘察孔3个,分别为ZK06、ZK07和ZK08,孔深分别为338、211、124 m,钻孔口径为75 mm。待钻孔施工达到设计孔深后,在ZK06、ZK07和ZK08号钻孔内分别进行提桶抽水试验及含水层划分(一般视岩芯破碎、节理裂隙发育地段为含水层),求取区内水文地质参数(渗透系数K、降深S、涌水量Q、影响半径R等)。此次勘察根据所求水文地质参数,采用地下水均衡法和地下水动力学法对隧道涌水量进行计算预测,左洞涌水量为13214.1 m^(3)/d,右洞涌水量为13192.5 m^(3)/d。The survey work for Jungong super long tunnel of the GDSC-2 section of the G227 Guide to Dawu Highway Project was completed in May 2022.The total length of Jungong super long tunnel is 12 km,and most of the area where Jungong super long tunnel is located is in high mountain areas.Island shaped permafrost is widely developed in areas above an altitude of 4,000m.Affected by the high cold and humid climate,evaporation is relatively weak,and atmospheric precipitation(rain)is relatively abundant.A large amount of precipitation directly seeps into the underground along cracks and pores to form frozen layer water,with moderate hydrogeological conditions.In this survey,three engineering geological(and hydrogeological)survey holes were set up for the tunnel body,namely ZK06,ZK07,and ZK08.The hole depths were 338m,211m,and 124m,respectively,with a borehole diameter of 75mm.After the drilling construction reached the design hole depth,bucket pumping tests and aquifer division were carried out in the ZK06,ZK07,and ZK08 boreholes respectively(generally considered as aquifers in areas with broken rock cores and developed joint fractures),calculating the hydrogeological parameters(permeability coefficient K,depth reduction S,water inflow Q,influence radius R,etc.)within the area.Based on the obtained hydrogeological parameters,the groundwater balance method and groundwater dynamics method are used to calculate and predict the tunnel water inflow.The left tunnel water inflow is 13,214.1m^(3)/d,and the right tunnel water inflow is 13,192.5m^(3)/d.

关 键 词：军功特长隧道 水文地质条件 水文地质参数 隧道涌水量 

分 类 号：P641.6[天文地球—地质矿产勘探]