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二滩水电站尾水调压室是典型的高边墙、大跨度、特大断面地下洞室，施工中采取了合理的开挖施工方案，如施工道路的布置以及施工支洞的设置等。根据高大洞室结构特点采用了有效的综合性支护方式，尤其是在开挖支护施工阶段跟踪进行围岩应力应受监测，及时调整施工方案，确保了整体围岩稳定和结构安全，在进度和质量方面都达到了预期的目的。对于施工中出现的各种不利情况，如岩爆、边墙顶拱局部变形大等，采取了一系列处理措施，取得了良好的效果，为类似的高大洞室开挖支护施工提供了可资借鉴的经验。
The tail water surge chamber of Ertan Hydropower Station is a typical high-wall, large-span and large-section underground cavern. The reasonable excavation construction scheme has been taken during construction, such as the layout of construction roads and the construction of construction branch holes. According to the structural characteristics of high caverns, an effective and comprehensive support method is adopted, especially the tracking of surrounding rock stress during excavation and support construction should be monitored and the construction plan adjusted in time to ensure the stability and structural safety of the whole surrounding rock. Progress and quality have achieved the intended purpose. A series of treatment measures have been taken for various unfavorable situations such as rockburst and local deformation of the side arch top arch, and good results have been obtained, which has provided a basis for similar excavation and support construction of large caverns Experience of borrowing money.