大岗山水电站右岸边坡位于大渡河断裂和磨西断裂所切割的断块上,地震发生频繁且烈度高,岩体卸荷强烈,构造稳定性差,裂隙发育集中。已有研究成果显示出边坡开挖过程中锚索支护的重要性,也有较多学者对抗剪洞支护的设计进行了较全面的研究。在已有的锚索支护基础上,基于卸荷理论对设计抗剪洞的再次支护效果和和采用拟静力法模拟的抗震效果进行评估,通过不同高程的关键点的位移响应,较系统地论证抗剪洞设置的必要性。通过研究应力的变化发现锚索支护段和抗剪洞支护段之间形成较为明显的拉裂区域。对工程后期监测提出建议。 The right bank slope of Dagangshan Hydropower Station is located on the fault block cut by Daduhe fault and Moxi fault. The earthquakes are frequent and intense with strong unloading of rock masses, poor structural stability and fissure development. The existing research results show the importance of anchor support in the excavation of slope, and more scholars have carried out a more comprehensive study on the design of the support of shear holes. On the basis of the existing anchor cable support, based on the unloading theory, the re-support effect of the designed shear-resistant hole and the seismic effect by pseudo-static method are evaluated. The displacement responses of the key points at different elevation are compared Systematically demonstrate the necessity of setting shear-resistant holes. Through the study of the change of stress, it is found that there is a obvious crack zone between the supporting section of the anchor cable and the supporting section of the shear-resistant tunnel. Suggestion on post-project monitoring.