高心墙堆石坝三维有限元分析及抗震安全评价
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摘要
近些年高土石坝的建设在我国得到了迅速的发展,西部地区由于水资源十分丰富,这些高坝多建于此,但西部大部分地区处于高烈度地震带,所以对这些高坝进行抗震安全评价具有十分重要的意义。特别是汶川大地震后,在分析高土石坝静力条件下应力变形的同时,对高土石坝的抗震安全性进行评价更加倍受人们的关注。
本文以实际工程项目为例,对350m级超高心墙堆石坝进行了如下的研究:
(1)根据坝体结构及地形地势特点建立了三维有限元模型,采用邓肯E-B模型对三维坝体进行了静力有限元分析。
(2)将湿化数学模型引入到静力有限元计算中,分析了考虑湿化前后坝体的应力位移变化,阐述了湿化变形对坝体的影响程度。
(3)在静动力有限元分析的基础上,对大坝进行抗震安全评价,分别采用等价节点力法对坝体的地震永久变形进行计算分析,采用Seed法对坝体心墙料、反滤料及坝基砂的动强度安全系数进行判断,针对坝体在地震荷载作用下的危险性情况,提出了相应的抗震加固措施,给出了一些有益的结论,为今后高土石坝的建设提供借鉴和参考。
The construction of high earth-rock dams had developed fast in the recent years.High earth-rock dams had built in the western areas which held rich water resources.But most of western areas located in high earthquake intensity regions.So the anti-seismic safety evaluation for high dams was very important.Specially after wenchuan earthquake the stress and deformation of high earth-rock dams were analyzed in the static condition.And people had paid close attention to the anti-seismic safety evaluation for high earth-rock dams.
This paper regarded actual engineering as an example.This 350m super-high core-wall rockfill dam was researched as follows:
(1) The 3D-FEM model was built based on structure of dam and terrain.The Duncan E-B model was used for 3D-FEM static analysis.
(2) The mathematic model of wetting was introduced in the 3D-FEM static calculation. The change of displacement and stress was analyzed after considering wetting.The effect of wetting with respect to dam was discussed.
(3) The anti-seismic safety evaluation for dam was completed on the foundation of static and dynamic finite element analysis.Analysis of earthquake induced permanent deformation for dam had done by equivalent nodal force method.The safety factor of core-wall material, filter material and sand of dam foundation under seismic loads had been estimated by Seed. According to the dangerous situation of dam under seismic loads the author had provided corresponding anti-seismic and reinforcement measures.At the same time gave some beneficial conclusions.This paper had provided experiences and references for future construction of high earth dams.
本文以实际工程项目为例,对350m级超高心墙堆石坝进行了如下的研究:
(1)根据坝体结构及地形地势特点建立了三维有限元模型,采用邓肯E-B模型对三维坝体进行了静力有限元分析。
(2)将湿化数学模型引入到静力有限元计算中,分析了考虑湿化前后坝体的应力位移变化,阐述了湿化变形对坝体的影响程度。
(3)在静动力有限元分析的基础上,对大坝进行抗震安全评价,分别采用等价节点力法对坝体的地震永久变形进行计算分析,采用Seed法对坝体心墙料、反滤料及坝基砂的动强度安全系数进行判断,针对坝体在地震荷载作用下的危险性情况,提出了相应的抗震加固措施,给出了一些有益的结论,为今后高土石坝的建设提供借鉴和参考。
The construction of high earth-rock dams had developed fast in the recent years.High earth-rock dams had built in the western areas which held rich water resources.But most of western areas located in high earthquake intensity regions.So the anti-seismic safety evaluation for high dams was very important.Specially after wenchuan earthquake the stress and deformation of high earth-rock dams were analyzed in the static condition.And people had paid close attention to the anti-seismic safety evaluation for high earth-rock dams.
This paper regarded actual engineering as an example.This 350m super-high core-wall rockfill dam was researched as follows:
(1) The 3D-FEM model was built based on structure of dam and terrain.The Duncan E-B model was used for 3D-FEM static analysis.
(2) The mathematic model of wetting was introduced in the 3D-FEM static calculation. The change of displacement and stress was analyzed after considering wetting.The effect of wetting with respect to dam was discussed.
(3) The anti-seismic safety evaluation for dam was completed on the foundation of static and dynamic finite element analysis.Analysis of earthquake induced permanent deformation for dam had done by equivalent nodal force method.The safety factor of core-wall material, filter material and sand of dam foundation under seismic loads had been estimated by Seed. According to the dangerous situation of dam under seismic loads the author had provided corresponding anti-seismic and reinforcement measures.At the same time gave some beneficial conclusions.This paper had provided experiences and references for future construction of high earth dams.
引文
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