高寒地区粉煤灰混凝土温控动态控制精细模拟  

Precise simulation of fly ash concrete′s temperature dynamic control in high and cold areas

作　　者：李梁[1,2] 周伟[1,2] 常晓林[1,2] 刘杏红[2,3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点试验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点试验室,湖北武汉430072 [3]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《华中科技大学学报（自然科学版）》2015年第7期6-11,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2013BC035900);国家自然科学基金资助项目(51322905)

摘　　要：通过粉煤灰混凝土试验,分析了不同等级粉煤灰对混凝土热力学性质影响.结合西藏高寒地区气温水温边界条件,基于热流管单元法对混凝土施工进行数值仿真模拟,计算混凝土温度场及应力场.根据数值仿真计算结果,确定适合高寒地区的混凝土基础温差及内外温差控制标准.建立通水冷却时空动态控制体系,完善混凝土表面保温及冬季保温措施,以防止混凝土表面裂缝及贯穿裂缝的产生.最后,推荐不同等级粉煤灰混凝土在大坝施工过程中的最优利用方案;根据校核后的温差控制标准,对施工期混凝土温度控制提出合理动态控制措施.Based on concrete tests,the influence of different grades fly ash on thermodynamic properties of concrete was studied.Combined with air temperature and water temperature in Tibet′s highcold and high-altitude areas as boundary conditions,using heat-fluid pipe element method,the process of a concrete dam construction was numerically simulated,and the temperature field and stress field of concrete were calculated.According to the numerical simulation results,the control standards of internal-external temperature difference and dam foundation temperature difference in cold areas could be sure.Meanwhile,a spatial-temporal dynamic cooling down control system was built.Then,surface heat preservation measures and heat preservation measures in winter were improved,which was useful to prevent concrete surface cracks and penetrating cracks.Finally,a best scheme that was about how to allocate the use of different kinds of fly ash concrete in dam construction was proposed.According to the new control standards of temperature difference,reasonable dynamic control measures about how to control concrete temperature during the construction were put forward.

关 键 词：高寒地区 粉煤灰混凝土 热流管单元 动态控制 温差应力 

分 类 号：TV642[水利工程—水利水电工程]