| 坝基玄武岩柱状节理松弛弱化对白鹤滩拱坝的影响分析 |
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| 引用本文： | 郭兴文,赵振磊,孙林松,徐建荣,何明杰,张伟狄.坝基玄武岩柱状节理松弛弱化对白鹤滩拱坝的影响分析[J].中州煤炭,2018,0(6):94-99，113. |
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| 作者姓名： | 郭兴文 赵振磊 孙林松 徐建荣 何明杰 张伟狄 |
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| 作者单位： | （1.河海大学 力学与材料学院，江苏 南京 210098； 2.扬州大学 水利与能源动力工程学院，江苏 扬州 225009； 3.中国电建集团华东勘测设计研究院，浙江 杭州 310014） |
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| 摘 要： | 白鹤滩水电站坝址区玄武岩柱状节理较为发育，建基面开挖会引起其发生松弛及模量弱化，进而对坝体的位移、应力状态产生影响。采用三维非线性有限元数值方法，通过玄武岩柱状节理不同松弛厚度与变形模量变化组合多方案计算分析，分析了柱状节理松弛层玄武岩性态变化对坝体位移应力的影响特征。结果表明，柱状节理卸荷松弛将引起坝体顺河向位移极值增大、指向右岸横河向位移极值增大、指向左岸横河向位移极值减小；坝体最大主拉应力及最大主压应力均增大，坝体最大梁向拉、压应力均增大，坝体最大拱向拉应力增大，坝体最大拱向压应力减小；随柱状节理松弛层变形模量的劣化，拱端横河向位移增加，拱端上游顺河向位移增加，拱端下游顺河向位移减小，拱端主拉应力增加、主压应力减小。随柱状节理松弛层厚度的增加，坝体位移、应力的变化很小，为不敏感因素。
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| 关 键 词： | 拱坝 非线性有限元 柱状节理 变形模量 |
Influence of relaxation and weakening of columnar joints of basalt in dam foundation of Baihetan hydropower station |
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| Guo Xingwen,Zhao Zhenlei,Sun Linsong,Xu Jianrong,He Mingjie,Zhang Weidi. Influence of relaxation and weakening of columnar joints of basalt in dam foundation of Baihetan hydropower station[J].Zhongzhou Coal,2018,0(6):94-99，113. |
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| Authors: | Guo Xingwen Zhao Zhenlei Sun Linsong Xu Jianrong He Mingjie Zhang Weidi |
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| Affiliation: | （1.College of Mechanics and Materials，Hohai University，Nanjing 210098，China； 2.College of Hydrulic，Energy & Power Engineering，Yangzhou University，Yangzhou 225009，China； 3.Hydro China Huadong Engineering Corporation，Hangzhou 310014，China） |
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| Abstract: | There is columnar joint at the dam site of Baihetan hydropower station，it can be influenced by the excavation and lead deformation modulus to relaxation，then it influence on the stress and displacement of the dam body.There dimensional nonlinear finite element method was adopted in this paper，multi scheme calculation of multi scheme combination of different deformation modulus and different relaxation thickness of basalt columnar joints was studied，and the effect of joint relaxation on the stress and displacement of dam body was studied.The results showed that，with the deterioration of deformation of modulus，and the displacement extremum of along the river of dam body was increased，and the transverse displacement extremum to right bank of dam body was increased，and the transverse displacement extremum to left bank of dam body was decreased；the tensile stress extremum and the compressive stress extremum of dam body was increased，and crown cantilever compressive stress extremum and crown cantilever tensile stress extremum of dam body was increased，and the arch tensile stress extremum of dam body was increased，the arch compressive stress extremum of dam body is decreased，with the deformation modulus of columnar joints relaxation layer becomes smaller，and the transverse displacement of the arch abutment is decreased，the displacement along the river of the arch abutment upstream was increased，the displacement along the river of the arch abutment downstream is decreased，the tensile stress of arch abutment was increased，the compressive stress of arch abutment was decreased，with columnar joints relation layer thickness increasing，the change of dam body displacement and stress was little，then it became the insensitive factors. |
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| Keywords: | ,arch dam, nonlinear finite element, columnar joint, deformation modulus |
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