某碾压混凝土拱坝混凝土温控防裂措施优化  

Optimization of temperature control and crack prevention measures for the concrete of a roller compacted concrete arch dam

作　　者：张国只 汪娟 王振红[2] 辛建达 李辉[2] ZHANG Guozhi;WANG Juan;WANG Zhenhong;XIN Jianda;LI Hui(Anyang Yindu Zhuquan Water Resources Development&Investment Co.,Ltd.;不详)

机构地区：[1]安阳殷都珠泉水资源开发投资有限公司,河南安阳455000 [2]中国水利水电科学研究院结构材料研究所,北京100038

出　　处：《大坝与安全》2021年第5期15-19,27,共6页Dam & Safety

基　　金：国家重点研发计划项目(2018YFC0406700);国家自然科学基金资助项目(51779277);中国水科院科研专项(SS0145B712017,SS0145B612017,SS0145B392016)。

摘　　要：为保证混凝土坝的施工质量、加快施工进度,需要对大坝的温控措施与标准进行复核和优化。以某碾压混凝土拱坝为例,采用三维有限元分析方法,对大坝不同保温力度、一期冷却和二期冷却流量对混凝土温度应力的影响进行仿真计算。结果显示:在坝面采取保温措施,应力减小8.18%,能显著改善坝面的温度和应力分布,提高安全系数;适当增大一冷流量,可使削峰效果更加明显,应力减小3.0%~5.0%;减小二冷流量,能更好地控制坝体的降温速率和改善应力分布,应力降幅超过20%。在仿真计算的基础上,对温控措施进行复核和优化,对工程建设具有重要指导意义。To ensure the quality and speed up the construction of concrete dam,it is necessary to review and optimize the temperature control measures and standards.Taking a roller compacted concrete arch dam as an example,the three-dimensional finite element analysis method is used to simulate the influence of different heat preservation efforts as well as the cooling flow rate in the first and second cooling stage on the temperature stress of concrete.The results show that:heat preservation on the dam surface can significantly improve the distribution of temperature and stress on dam surface and improve the safety factor;properly increasing the cooling flow rate in the first stage can make the peak cutting effect more obvious;lower cooling flow rate in the second stage can better control the cooling rate of the dam body and improve the stress distribution.Based on the simulation calculation,the temperature control measures are reviewed and optimized,which is of great significance to construction.

关 键 词：碾压混凝土拱坝 温控防裂 温度场 温度应力场 措施优化 

分 类 号：TV315[水利工程—水工结构工程]