万开高速浦里隧道水文地质勘查及涌水量预测

目前国内尚无成熟的隧道涌水量预测技术方法。通过对重庆万开浦里隧道工程区进行水文地质勘查和专门水文地质钻探、试验,划分隧道工程区含水岩组及富水性,进而确定隧道工程区水文地质单元:隧道工程区由北向南分为南、北两个大的水文地质单元,北侧水文地质单元位于浦里隧道0+6000段,地表水及地下水向长江排泄;南侧水文地质单元位于浦里隧道6 000+11 000段,地表水及地下水向浦里河排泄,最后经浦里河排向长江。先选用径流模数法、大气降水法、裘布依理论式法、佐藤邦明经验式法对隧道正常涌水量进行预测,再选用古德曼经验式法、佐藤邦明非稳定流式法对隧道最大涌水量进行预测,并与已建邻近相同水文地质单元铁峰山二号隧道实际涌水量比较,二者正常涌水量量级相当,表明预测成果可靠。相关分析方法可供类似工程参考。

Hydrogeological exploration and gushing water prediction of Puli Tunnel in Wanxian City of Chongqing

At present, there is no mature forecast technology for tunnel gushing water prediction in China. Through hydrogeological exploration, the water-bearing rock group and water inrush property were determined, and further the Puli Tunnel engineering area were divided as two large hydrogeological units: the north unit located in the tunnel section 0+6000 where the surface flow and ground flow discharge into the Yangtze River, the south one located in the tunnel section 6000 to 11000 where the surface flow and ground flow discharge into the Puli River firstly and then into Yangtze River. In this paper, Runoff Modulus, Precipitation method, Jules Dupuit Formula and Misaki Sato Kuniki Formula are employed to predict the normal tunnel water gushing, and Goodman Experience Formula and Misaki Sato Kuniki Unstable Flow Formula are employed to predict the maximum water gushing. The predicted results are compared with the actual water gushing volume of the completed adjacent Tiefeng Mountain No.2 tunnel that has the same hydrogeological unit. The comparison result shows that the two tunnels have the same water gushing in magnitude, indicating the predicted results are reliable and the analysis method could be a reference for similar projects.