水文地质试验在隧道工程地质勘察中的应用及涌水量预测  

Application of Hydrogeological Test in Tunnel Engineering Geological Investigation and Prediction of Water Inflow

作　　者：程小勇 CHENG Xiaoyong(Guangdong Communication Plainning&Design Institute Group Co.,Ltd.,Guangzhou 510507)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司,广州510507

出　　处：《公路交通技术》2022年第4期128-135,142,共9页Technology of Highway and Transport

摘　　要：深埋特长隧道的水文地质勘察及涌水量预测是隧道方案设计的重要依据。以拟建的深圳外环高速公路三期工程田头山隧道为例,通过分析隧址区地质构造特征,并结合隧道深孔钻探,在孔内开展抽水试验、水位恢复试验、压水试验,以获取隧址区典型深度段岩体的渗透系数,然后采用降水入渗系数法、裘布依理论式及古德曼经验式对隧道涌水量进行预测及分析;同时综合隧址区工程地质与水文地质特征,分段预测出了隧道的涌水量。通过研究认为,该隧道受节理裂隙发育带、褶皱构造、强烈风化的影响,局部将会形成导水通道,在隧道施工时可能产生涌水;复式向斜轴部是地下水富集区域,是良好的储水构造,开挖后会造成大量地下水涌出。Hydrogeological investigation and water inflow prediction of deep-buried extra-long tunnel are important basis for tunnel scheme design.In this paper,the Tiantoushan tunnel of the proposed phaseⅢproject of Shenzhen Outer Ring Expressway is taken as an example,by analyzing the geological structure characteristics of the tunnel site area and combining with the deep hole drilling of the tunnel,the pumping test,water level recovery test and water pressure test are carried out in the hole to obtain the permeability coefficient of the rock mass in the typical depth section of the tunnel site area.Then,the precipitation infiltration coefficient method,Dupuit’s formula and the Goodman empirical formula are used to predict and analyze the water inflow of the tunnel.Based on the engineering geological and hydrogeological characteristics of the tunnel site,the water inflow of the tunnel is predicted in sections.The study shows that the tunnel is affected by joint fissure development zone,fold structure and strong weathering,local water diversion channel will be formed,which may cause water gushing during tunnel construction.The complex syncline axis is a groundwater enrichment area and a good water storage structure,which will cause a large number of groundwater outflow after excavation.

关 键 词：深埋特长隧道 公路隧道工程 抽水试验 压水试验 涌水量预测 

分 类 号：U456.32[建筑科学—桥梁与隧道工程]