| 特高心墙堆石坝基础混凝土垫层受力特性研究 |
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| 引用本文： | 苗君,曹学兴,邱焕峰,程瑞林.特高心墙堆石坝基础混凝土垫层受力特性研究[J].中国农村水利水电,2021(4):182-187. |
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| 作者姓名： | 苗君 曹学兴 邱焕峰 程瑞林 |
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| 作者单位： | 中国电建集团贵阳勘测设计研究院有限公司;华能澜沧江水电股份有限公司 |
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| 基金项目： | 贵州省科技计划项目(黔科合基础[2016]1154);贵州省科技计划项目(黔科合支撑[2018]2809)。 |
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| 摘 要： | 目前我国已规划设计的200 m级以上特高心墙堆石坝,除深厚覆盖层上240 m高的长河坝外,其余工程均清除心墙基础部位全部覆盖层和软弱岩层,并浇筑混凝土垫层找平。混凝土垫层作为防渗心墙与基岩的连接部位,其受力情况复杂且影响因素较多。通过有限元数值计算,研究某315 m特高心墙堆石坝基础混凝土垫层的应力变形状态。计算结果表明:对于“V”形深切峡谷的特高心墙堆石坝,上覆坝体压力大部分传至岸坡,混凝土垫层在左、右岸中下部变形较大,将导致河床中部混凝土垫层横河向拉应力增大;上覆坝体压力以及防渗心墙拱效应等原因将导致混凝土垫层在心墙与反滤交界位置顺河向拉应力增大;合理设置垫层结构纵缝、适当增加垫层厚度等措施可有效降低混凝土垫层拉应力。
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| 关 键 词： | 特高心墙堆石坝 混凝土垫层 应力变形特性 结构设计 |
Research on the Stress Characteristics of Concrete Cushion of Ultra-high Core Wall Rockfill Dam |
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| MIAO Jun,CAO Xue-xing,QIU Huan-feng,CHENG Rui-lin.Research on the Stress Characteristics of Concrete Cushion of Ultra-high Core Wall Rockfill Dam[J].China Rural Water and Hydropower,2021(4):182-187. |
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| Authors: | MIAO Jun CAO Xue-xing QIU Huan-feng CHENG Rui-lin |
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| Institution: | (PowerChina Guiyang Engineering Corporation Limited,Guiyang 550081,China;Huaneng Lancang River Hydropower Co.,Ltd,Kunming 650214,China) |
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| Abstract: | Among ultra-high core wall rockfill dams,planned and designed in China at present,except for 240 m Changhe Dam with deep overburden,the other projects remove the entire overburden and weak rock and pour the concrete cushion to fill it up.As the connection part of impervious core and bedrock,the force of the concrete cushion is complicated and influenced by many factors.The stress and deformation behaviors of concrete cushion of 315 m ultra-high core wall rockfill dam are studied by finite element calculation.The numerical results show that for high core wall rockfill dam with the“V”shaped deep canyon,most of the dam pressure spreads to the band slope.The concrete cushion experiences a large deformation in the middle and lower part of the bank slope,which will lead to the excessive transverse tensile stress of the concrete cushion in the middle of the riverbed.The dam pressure and the core wall arch effect will lead to the excessive longitudinal tensile stress of concrete cushion between the boundary of core wall and inverted filter.Reasonable setting of the joint and increasing the thickness can effectively reduce the tensile stress of concrete cushion. |
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| Keywords: | ultra-high core wall rockfill dam concrete cushion stress and deformation behaviors structural design |
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