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天生桥二级水电站引水隧洞穿过多条岩溶管道。隧洞在施工期多处发生了大涌水。根据暗河的岩溶水文地质条件，分析了高外水压力形成机制；并进行平面渗流场分析，研究设置排水洞后降低外水压力效果。结果表明：设置排水洞后外水压力大大降低．目前，排水洞及其支洞已戳住部分暗河水流，排水效果明显。证明设排水洞是降低外水压力的有效措施。
Tianshengqiao two hydropower station diversion tunnel through a number of karst pipeline. Large influx of water occurred in the tunnel during construction. According to the hydrogeological conditions of the underground river, the formation mechanism of high external water pressure is analyzed. The plane seepage field analysis is conducted to study the effect of reducing the external water pressure after the drainage hole is set up. The results show that the external water pressure is greatly reduced after the drainage hole is set. At present, the drainage hole and its branch hole have already punctured part of the underground river flow, and the drainage effect is obvious. Demonstration of drainage holes is an effective measure to reduce external pressure.