摘要
金沙水电站攀钢尾矿骨料和拌制的混凝土各项性能均能满足工程要求,但相同标号的尾矿骨料混凝土胶凝材料用量较原开挖料方案多10~20 kg/m^3,混凝土绝热温升高出1.0℃~2.0℃。通过不同施工方案的对比分析提出了适用于金沙水电站大坝尾矿骨料混凝土的温控防裂方案,并采用三维有限单元法对大坝施工期温度场和温度应力场进行仿真计算。结果表明:采用推荐的温控措施,各部位最高温度均满足设计允许最高温度,混凝土抗裂安全系数可达到1.8以上,满足混凝土坝温度控制设计规范中抗裂安全系数需达到1.5~1.8的要求;尾矿料用作大坝混凝土骨料在施工和温控上是可行的,具有巨大的环境和经济效益。
Concrete laboratory test results have indicated that the concrete performance with tailings aggregate of Panzihua steel plant can meet all the requirements of Jinsha Hydropower Station. While using tailings aggregate makes the concrete cementing material content increase by 10~20 kg/m^3, and therefore the concrete adiabatic temperature increases by 1℃~2℃. According to the temperature sensitivity analysis aiming at different construction schemes, a temperature control and crack prevention scheme for tailing aggregate concrete of the gravity dam was proposed. The 3 D finite element method was used to simulate the transient temperature and the thermal stress field. The result showed that by using recommended temperature control measures, the maximum temperature in entire region of the gravity dam could meet the design standards, and the concrete crack resistance safety coefficient could reach more than 1.8. The research proved the feasibility of using steel factory tailings as concrete aggregate for dam construction and temperature control, which has tremendous benefits of economics and environment.
作者
段寅
李勤军
梁仁强
DUAN Yin;LI Qinjun;LIANG Renqiang(Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd,Wuhan 430010,China)
出处
《人民长江》
北大核心
2019年第11期217-220,236,共5页
Yangtze River
基金
长江科学院开放研究基金资助项目(CKWV2015224/KY)
长江勘测规划设计研究院自主创新项目(CX2017Z26)
关键词
尾矿骨料
混凝土
温控措施
温度应力
有限单元法
tailings aggregate
concrete
temperature control measures
thermal stress
finite element method
