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对四川省双江口水电站工程的地下洞群的节理岩体围岩稳定性进行研究,分别采用了弹塑性模型、节理岩体断裂损伤模型进行数值分析。在弹塑性模型中,采用锚固等效法来模拟锚杆及锚索的支护效果。断裂损伤模型以损伤及断裂力学原理为基础,运用损伤本构模型和损伤演化方程在FLAC3D软件的框架下开发出子程序,考虑了岩体中节理裂隙对洞室围岩稳定性的影响,进而得到用上述的模型和计算程序分析出的围岩塑性区、损伤演化区和位移规律。将两种模型的计算结果与相应工程模型试验的结果进行了比较分析。研究结果表明,损伤模型更接近工程实际情况,与模型试验结果更为接近。
The stability of surrounding rock of jointed rock mass of underground caverns in Shuangjiangkou hydropower station in Sichuan Province was studied. Elastic-plastic model and fracture damage model of jointed rock mass were respectively used for numerical analysis. In the elasto-plastic model, the anchoring equivalent method is used to simulate the supporting effect of rock bolts and anchor cables. Based on the damage and fracture mechanics theory, the damage damage model is developed based on the damage constitutive model and the damage evolution equation. The subroutine is developed under the framework of FLAC3D software. The influence of the joint and fracture in the rock mass on the stability of the surrounding rock in the cavern is considered. The plastic zone, damage evolution zone and displacement rule of the surrounding rock analyzed by the above model and calculation program are obtained. The results of the two models are compared with those of the corresponding engineering model tests. The results show that the damage model is closer to the actual situation of the project and is closer to the model test results.