挤压边墙对面板堆石坝结构性态的影响分析
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摘要
为深入了解挤压边墙施工对面板及堆石体应力和变形的影响,以柬埔寨某混凝土面板堆石坝为例,采用三维非线性有限元法建立了坝体三维有限元模型,对比分析了采用传统施工法与挤压边墙施工法时大坝应力和变形的变化规律,研究了挤压边墙对堆石体和面板应力和变形的影响。结果表明,正常蓄水位工况下采用挤压边墙施工对堆石体的应力和变形影响不明显;混凝土面板的顺坡向压应力减少约400kPa,拉应力区明显减小,拉应力值减少约800kPa,面板挠度减少约20mm,可见面板的受力状态和挠度有较大改善。
In order to analyze the influence of extrusion side wall construction on stress and deformation of concrete facing rockfill dam(CFRD),three-dimensional nonlinear finite element method(FEM) is applied to establish FEM model of the dam body by taking a certain CFRD in Cambodia for an example.Stress and deformation of the dam are investigated with traditional construction method and extrusion side wall method.The results show that under normal water level condition,the extrusion side wall technology almost has no impact on the stress and deformation of the dam body;the compressive stress of the face slab reduced by about 400 kPa;and the tensile stress zone reduced significantly;tensile stress reduced by about 800 kPa and the deformation of the face slab reduced by about 20 mm.So,the working status and deflection of the face slab are improved obviously.
In order to analyze the influence of extrusion side wall construction on stress and deformation of concrete facing rockfill dam(CFRD),three-dimensional nonlinear finite element method(FEM) is applied to establish FEM model of the dam body by taking a certain CFRD in Cambodia for an example.Stress and deformation of the dam are investigated with traditional construction method and extrusion side wall method.The results show that under normal water level condition,the extrusion side wall technology almost has no impact on the stress and deformation of the dam body;the compressive stress of the face slab reduced by about 400 kPa;and the tensile stress zone reduced significantly;tensile stress reduced by about 800 kPa and the deformation of the face slab reduced by about 20 mm.So,the working status and deflection of the face slab are improved obviously.
引文
[1]周厚贵.水布垭堆石坝混凝土面板施工技术创新[J].水电能源科学,2010,29(1):54-56,11.
[2]仵义平,李宜田.黄河公伯峡面板堆石坝工程施工新技术的应用[J].水电能源科学,2008,26(2):94-96.
[3]潘文学,孙淑侠.挤压式混凝土边墙固坡施工法在黄河公伯峡水利工程中的应用[J].水利与建筑工程学报,2005,3(2):44-47,51.
[4]梁向峰.混凝土挤压式边墙技术在黄河公伯峡水电站工程中应用[J].西北水力发电,2006,22(4):87-89.
[5]肖化文.水布垭面板坝挤压边墙技术有限元计算分析[J].大坝与安全,2004(3):3-8.
[6]吕玉峰,周庆瑜.挤压边墙施工方法对面板受力的影响[J].东北水利水电,2007,25(6):8-10.
[7]马明,沈振中,吕生玺.九甸峡混凝土面板堆石坝挤压边墙施工有限元仿真分析[J].水利水电技术,2008,39(9):59-62,70.
[8]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1988.
[2]仵义平,李宜田.黄河公伯峡面板堆石坝工程施工新技术的应用[J].水电能源科学,2008,26(2):94-96.
[3]潘文学,孙淑侠.挤压式混凝土边墙固坡施工法在黄河公伯峡水利工程中的应用[J].水利与建筑工程学报,2005,3(2):44-47,51.
[4]梁向峰.混凝土挤压式边墙技术在黄河公伯峡水电站工程中应用[J].西北水力发电,2006,22(4):87-89.
[5]肖化文.水布垭面板坝挤压边墙技术有限元计算分析[J].大坝与安全,2004(3):3-8.
[6]吕玉峰,周庆瑜.挤压边墙施工方法对面板受力的影响[J].东北水利水电,2007,25(6):8-10.
[7]马明,沈振中,吕生玺.九甸峡混凝土面板堆石坝挤压边墙施工有限元仿真分析[J].水利水电技术,2008,39(9):59-62,70.
[8]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1988.
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