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锦屏二级水电站（ 一期） 工程的关键技术是４ 条长达１８ ｋｍ 、开挖洞径１１ ｍ 、最大埋深２ ５００ ｍ 左右深埋长隧洞的设计与施工。为了解地下洞室的工程地质和水文地质情况， 给设计与施工提供科学依据， 前期曾开挖了２条长约５ ｋｍ 的探洞。长探洞所揭示的水文地质现象， 用反分析手段找出岩体渗透系数、入渗边界及探洞出流与区域地下水的关系， 评价探洞对周围地下水影响， 对设计引水洞区域的外水压力及涌水进行预测。该成果对引水隧洞的支护设计有参考价值
The key technologies of the Jinping II Hydropower Station (Phase I) are four long and deep tunnels with a length of 18 km, a tunnel diameter of 11 m and a maximum depth of 2 500 m. In order to understand the engineering geology and hydrogeology of the underground caverns, it provides a scientific basis for the design and construction. Two caverns of about 5 km have been excavated in the previous period. The hydrogeological phenomena revealed by the long caverns are analyzed by means of back analysis to find out the relationship between the permeability coefficient of rock mass, infiltration boundary and caverns and groundwater, and to evaluate the influence of caverns on the surrounding groundwater. Water pressure and gushing water are predicted. The result has reference value for the design of diversion tunnel support