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将加、卸载响应比理论引入地下岩体洞室群地震响应分析中。以输入的地震加速度作为加、卸载,以洞室围岩的加速度作为响应,合理地确定了加、卸载响应区段。通过有限差分程序FLAC3D建立了白鹤滩水电站13号机组剖面数值分析模型,选用汶川地震波进行动力时程计算,探讨地下岩体洞室群的地震动力稳定性,研究结果表明:在100年超越概率2%的地震作用下,白鹤滩水电站地下洞室群围岩响应比峰值范围在4.05～11.52之间;结合应力及位移分析,主厂房拱顶及层间错动带C4在尾调室上游边墙出露部位的围岩均进入了非线性变形状态,但响应比在整个时程中并没有趋于无穷大,围岩没有发生失稳破坏;错动带两侧的围岩产生了一定的相对位移,会对尾调室的边墙稳定性产生不利影响。该研究方法可应用于一般地下岩体结构的地震稳定性分析中。
The introduction of loading and unloading response ratio theory into the underground rock cavern group earthquake response analysis. Taking the input seismic acceleration as add and unload, in response to the acceleration of the surrounding rock of the cavern, the response sections of loading and unloading are reasonably determined. Through finite difference program FLAC3D, the numerical analysis model of No.13 unit of Baihetan Hydropower Station was established. The Wenchuan seismic wave was used to calculate the dynamic time history and the seismic dynamic stability of underground rock cavern group was studied. The results show that in 100 years, % Of the earthquakes, the response range of the surrounding rock mass of the underground caverns at Baihetan Hydropower Station is between 4.05 and 11.52. According to the analysis of stress and displacement, The surrounding rock of the exposed part all entered the nonlinear deformation state, but the response ratio did not tend to infinity in the whole time history, and the surrounding rock did not destabilize and destroy. The surrounding rock on both sides of the dislocation zone had some relative displacement , Will adversely affect the stability of the sidewall of the tail transfer room. The research method can be applied to the seismic stability analysis of the general underground rock mass structure.