锦屏一级水电站尾调室洞径大、地应力高、地质条件复杂，穹顶施工中的质量控制及施工期围岩稳定是施工中的重点和难点。针对这些特点进行研究，确定了穹顶开挖的质量控制方法、及时支护的施工方案以及不良地段和岩爆部位的支护措施。施工质量得到了良好的控制，施工期工程安全得到了保证，并取得了一定的经验。

The tailrace surge chamber of Jinping Hydropower Station (I) is characterized by large diameter, high ground stress and complicated geological conditions. The control of the construction quality and surrounding rock stability is the key of the construction. On basis of study on the above characteristics, the authors determine the quality control method, construction scheme for timely support and countermeasures for unfavorable sections and rock burst positions. Due to the measures taken, the construction quality and the punctual completion of the project are ensured.