水工隧洞地震反应影响因素分析
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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。
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.
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.
引文
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[11]SL203-97,水工建筑物抗震设计规范[S].
[2]赵成刚.地下管线抗震问题评述[J].世界地震工程,1988,(4):18-26.
[3]黄浩华.地震模拟振动台的设计与应用技术[M].1版.北京:地震出版社,2008.
[4]沈德建,吕西林.地震模拟振动台及模型试验研究进展[J].结构工程师,2006,22(6):55-58.
[5]龚治国,吕西林.混合结构体系高层建筑模拟地震振动台试验研究[J].地震工程与工程振动,2004,24(4):99-105.
[6]张春霞,李昌铸,卢铁瑞,等.现行桥梁抗震设计的反应谱分析方法[J].公路交通科技,2008,(9):8-10.
[7]GB/50011-2001,建筑抗震设计规范[S].
[8]朱镜清.结构抗震分析原理[M].北京:地震出版社,2002.
[9]杨穗华.规范反应谱理论介绍[J].广东土木与建筑,2008,(4):23-25.
[10]吴小峰,孙启国,狄杰建,等.抗震分析反应谱法和时程分析法数值仿真比较[J].西北地震学报,2011,(9).
[11]SL203-97,水工建筑物抗震设计规范[S].
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