阻抗长廊式调压室一般规模较大,其作为一种典型的水电站地下建筑物,受地质条件及人工开挖支护方式的影响很大。以黄金坪水电站调压室为例,利用FLAC3D软件对洞室开挖和支护过程中的围岩稳定性进行研究,根据应力和应变的变化情况,提出相应的支护方案并进行模拟分析。结果表明,所提方案合理,可为工程支护设计提供理论依据。 The impedance corridor-type surge chamber is generally large in scale. As a typical underground structure of a hydropower station, it is greatly affected by geological conditions and artificial excavation and support methods. Taking the surge chamber of Huangjinping Hydropower Station as an example, FLAC3D software was used to study the surrounding rock stability during the excavation and support of the cavern. According to the change of stress and strain, the corresponding support scheme was proposed and simulated. The results show that the proposed scheme is reasonable and can provide theoretical basis for engineering support design.