高寒地区高拱坝外掺MgO混凝土的温度应力补偿效果研究  

Study on Effect of Thermal Stress Compensation for MgO Concrete of High Arch Dam in Cold Area

作　　者：张续[1] 刘杏红[2] 井向阳[1] 王琼[1] 常晓林[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《水电能源科学》2013年第11期82-85,共4页Water Resources and Power

基　　金：中央高校基本科研业务费专项资金资助项目(201120602020010)

摘　　要：鉴于外掺MgO微膨胀混凝土筑坝技术对提高高寒地区混凝土坝的施工速度和经济效益的意义,对高寒地区高拱坝外掺MgO混凝土的温度应力进行了仿真计算,分析了不同MgO掺量对温度应力补偿效果的影响及坝体不同部位掺MgO的膨胀补偿效果。结果表明,在大坝内部,掺MgO对混凝土能起到较好的温度应力补偿作用,且在一定范围内MgO掺量越大,应力补偿作用越明显;对大坝表面混凝土,掺MgO可能使混凝土表面拉应力增大,可通过加强表面保温来有效控制表面拉应力,且宜采用长期保温的温控措施。Study of concrete mixed with MgO micro-expansion dam construction technology has great significance to increase the speed of concrete dam construction in cold area and raise economic benefits. Thermal stress of concrete mixed with MgO high arch dam in cold area is simulated. It analyzes the influence of different MgO content on stress compensa- tion effect as well as different parts of the dam expansion compensation effect of MgO concrete. The results show that in- side the dam, mixed with MgO is better for compensate of thermal stress; within a certain range, the MgO content is lar- ger, the stress compensation is more obvious; hut on the surface concrete of the dam, mixed with MgO increases tensile stress of surface concrete; through strengthening thermal preservation can effectively control tensile stresses on the sur- face, and long-term thermal preservation is preferable.

关 键 词：高寒地区 高拱坝 外掺MGO混凝土 温度应力补偿 

分 类 号：TV431[水利工程—水工结构工程] TV315