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以中卫-贵阳天然气联络线长江隧道穿越为例,介绍了河流隧道穿越水文地质调查与涌水量预测的基本方法。通过分析研究区地下水类型、补给径流排泄条件、水体化学特征,查明了隧道穿越区水文地质特征;通过野外抽、压水实验,确定各层的渗透系数,分别利用古德曼经验公式、裘布依理论公式、佐藤邦明非稳定流公式与狭长水平廊道法对隧道涌水量进行计算,综合预测隧道的正常涌水量与最大涌水量。预测隧道正常涌水量为3514.43m3/d,最大涌水量为37453.51m3/d。最后提出长江隧道穿越进一步设计与施工的建议。
Taking the crossing of the Yangtze River Tunnel between Zhongwei and Guiyang natural gas connecting lines as an example, the basic methods for river tunnel crossing hydrogeological survey and water inflow prediction are introduced. Through analyzing the types of groundwater in the research area, the conditions of runoff discharge and the chemical characteristics of water bodies, the hydrogeological characteristics of the tunnel crossing area were identified. The permeability coefficient of each layer was determined by field pumping and water pressure experiments. Using Goodman’s empirical formula, Bouy theorem formula, unsteady flow Sato Bangming formula and the narrow horizontal corridor tunnel water inflow calculation, a comprehensive prediction of the tunnel normal inflow and the maximum influx. The predicted normal water inflow is 3514.43m3 / d and the maximum water inflow is 37453.51m3 / d. Finally, we put forward suggestions for further design and construction of the Yangtze River tunnel.