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本文就鲁布革水电站地下厂房洞室附近两处断层的流变性态对主厂房洞室围岩稳定力学效应作了粘弹塑性有限元法数值分析。计算中以断层内充填的粘土类矿物质材料的剪切流变属性为研讨的重点,建议了能反映断层厚度影响的新的流变模型及其参数测定方法。 研究表明,在考虑了洞室附近断层的流变性态以后,洞周围岩的受力状况有相当程度的恶化。断层流变对洞室围岩的力学效应主要与其离开洞室的距离D与洞室最小几何尺寸d的比值,即值的大小有关。一般地,当该比值小于1时应予重视,其影响大小还因岩体和断层充填物的物理力学性质的差别以及断层与洞室的相对方位的不同而不同。对于洞周附近局部围岩出观的拉力区段,建议了在设计中采取增设锚杆等辅助的加固措施。
In this paper, the viscoelastic-plastic finite element method (FEM) method is used to analyze the effect of rheological behavior of two faults near the underground powerhouse of the Lubuche Hydropower Station on the stability of surrounding rock of the main powerhouse. In the calculation, the shear rheological properties of clay mineral materials filled in faults are the focus of the study. A new rheological model and parameter determination method that can reflect the influence of fault thickness are proposed. Studies have shown that after considering the rheological behavior of the fault near the cavern, the stress condition of the rock around the cavern deteriorated considerably. The mechanical effect of fault rheology on the surrounding rock of the cavern is mainly related to the ratio of the distance D from the cavern to the minimum geometric dimension d of the cavern, that is, the value of the value. Generally, attention should be paid when the ratio is less than 1, and the influence size is also different due to the difference in the physical and mechanical properties of the rock mass and the fault filling and the relative orientation of the fault and the cavern. For the pull section of the local surrounding rock around the hole, it is recommended that additional reinforcement measures such as anchor bolts be adopted in the design.