【摘要】 利用ANSYS有限元软件对大岗山水电站尾水隧洞进行地震反应数值模拟,采用振型反应谱法,考虑了隧洞正常运行充水工况下的地震反应。模型为二维平面模型,采用plane 42单元划分网格,两侧宽度和底部厚度分别为隧洞宽度和高度的10倍,围岩类别为Ⅲ类,衬砌为C20混凝土,两侧和底边边界采用法向固定约束,在此基础上分别计算不同类别围岩下、衬砌弹模变化的情况下以及固结灌浆对衬砌应力和变形的影响。结果表明围岩类别的变化对衬砌应力和变形有较大的影响,而衬砌弹模变化或固结灌浆时,衬砌应力和变形的变化相对较小。根据计算结果提出一些建议措施。更多还原

【Abstract】 The numerical simulation of seismic response to the tailrace tunnel of Dagangshan Hydropower Station is analyzed by ANSYS finite-element software.The Modal Response Spectrum Method is used to consider the seismic response of the tunnel under the normal operation of water-filled waters.The model is a two-dimensional plane model,divided by plane 42 element.Both sides of the width and the thickness of the bottom width is 10 times of width and height of the tunnel,the rock classification is Ⅲ and the lining is C20 concrete.the impact of different rock classification,lining elastic modulus and consolidation grouting on the stress and deformation of the hydraulic tunnel is calculated.The results show that the change of the surrounding rock categories has a greater influence on the tunnel lining stress and deformation,but the influence of lining elastic modulus change and consolidation grouting on the stress and deformation is relatively small.Some suggestions have been given according to the results.更多还原