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二滩水电站地下厂房系统洞室群规模巨大，其跨度、高度均位居世界前列。由于场区地应力比较高，在开挖期间出现了局部围岩的大变形及岩爆、喷混凝土层剥落等不良现象。对围岩采用系统喷锚支护，局部作加强处理，稳定性良好。工程利用岩体质量Ｑ值确定围岩支护压力，为在设计支护强度方面提供了实例。
The underground powerhouse system of Ertan Hydropower Station has a large-scale cavern group with the highest span and height in the world. Due to the relatively high ground stress, large deformation of local surrounding rock, rock burst and spalling of sprayed concrete layer occurred during excavation. Surrounding rock sprayed by the system anchor support, locally for enhanced treatment, good stability. The project uses the Q value of rock mass to determine the surrounding rock supporting pressure, which provides an example for designing the supporting strength.