狭窄河谷深覆盖层地基高面板堆石坝应力变形特性研究
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摘要
为研究狭窄河谷深覆盖层上高面板堆石坝的应力变形特性,本文基于邓肯-张E-B非线性本构模型,采用中点增量法,结合九甸峡高面板堆石坝工程实例,对其施工期和运行期的应力变形进行了三维有限元仿真分析。结果表明:与一般建基于宽浅河谷及基岩坝基情况的面板堆石坝相比,在狭窄河道深覆盖层地基上建设高面板堆石坝,竣工期和蓄水期的坝体水平位移分布受覆盖层的影响较大,坝体应力分布也呈现出与岩石坝基有所不同的分布特征,面板的应力变形基本均在正常范围内,但蓄水期面板接缝尤其是周边缝位移相对较大,因此建议设计应对接缝止水采取相应的防护措施。
In order to research the stress and deformation properties of high concrete-faced rockfill dam under the conditions of narrow valley and deep overburden layer foundation,this article applied the mid-point increment method and took Jiudianxia high rockfill dam as an example to analyse stress and deformation of 3-D finite element numerical simulation in construction period and operation period,which are based on Duncan-Chang E-B non-linear constitutive model.The results showed that compared with the rockfill dam under the conditions of wide and shallow valley in the completion period and the storage period,the distribution of horizontal displacement of the high rockfill under the the conditions of narrow valley and deep overburden layer foundation is more greater influenced by cover,the stress distribution of dam also appears to have different distribution characteristics,stress and deformation of the panel in the normal range.However,in storage period,panel joints,especially the displacement of peripheral joint is more larger.Therefore,we suggest that we should take appropriate protective measures to respond to joint sealing.
In order to research the stress and deformation properties of high concrete-faced rockfill dam under the conditions of narrow valley and deep overburden layer foundation,this article applied the mid-point increment method and took Jiudianxia high rockfill dam as an example to analyse stress and deformation of 3-D finite element numerical simulation in construction period and operation period,which are based on Duncan-Chang E-B non-linear constitutive model.The results showed that compared with the rockfill dam under the conditions of wide and shallow valley in the completion period and the storage period,the distribution of horizontal displacement of the high rockfill under the the conditions of narrow valley and deep overburden layer foundation is more greater influenced by cover,the stress distribution of dam also appears to have different distribution characteristics,stress and deformation of the panel in the normal range.However,in storage period,panel joints,especially the displacement of peripheral joint is more larger.Therefore,we suggest that we should take appropriate protective measures to respond to joint sealing.
引文
[1]Duncan J.M.Chang C Y.Nonlinear analysis of stress and strain[J].Journal of Soil Mechanics and Foundation Divi-sion.1970,96(5):1629-1653.
[2]司洪祥.论土石坝应力应变计算中的邓肯模型[M].南京:水利水运科学研究.1985.89-97.
[3]陈慧远.土石坝有限元分析[M].南京:河海大学出版社.1988:55-83.
[4]钱家欢.土工原理与计算第二版[M].北京:中国水利水电出版社.1996:10-56.
[5]王世夏.水工设计的理论和方法[M].北京:中国水利水电出版社.2000:343-383.
[6]中国水利水电科学研究院.九甸峡水利枢纽工程大坝地震反应分析与安全评价[R].北京:中国水利水电科学研究院.2005.
[7]《水布垭面板堆石坝前期关键技术研究》编写委员会.水布垭面板堆石坝前期关键技术研究[M].北京:中国水利水电出版社,2005:68-137,164-199.
[2]司洪祥.论土石坝应力应变计算中的邓肯模型[M].南京:水利水运科学研究.1985.89-97.
[3]陈慧远.土石坝有限元分析[M].南京:河海大学出版社.1988:55-83.
[4]钱家欢.土工原理与计算第二版[M].北京:中国水利水电出版社.1996:10-56.
[5]王世夏.水工设计的理论和方法[M].北京:中国水利水电出版社.2000:343-383.
[6]中国水利水电科学研究院.九甸峡水利枢纽工程大坝地震反应分析与安全评价[R].北京:中国水利水电科学研究院.2005.
[7]《水布垭面板堆石坝前期关键技术研究》编写委员会.水布垭面板堆石坝前期关键技术研究[M].北京:中国水利水电出版社,2005:68-137,164-199.
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