论文部分内容阅读
红河二级拱坝是建在寒冷地区宽Ｕ型河谷上的一座无底缝薄拱坝，采用单曲三心圆拱布置，最大坝高３１ｍ，厚高比０．１９，弧高比７．５３。由于大坝地处高寒山区，温度荷载作用引起的坝体应力占总荷载作用的７８％，是寒冷地区薄拱坝设计的主要荷载，因此在拱坝设计中采取在大坝下游面粘贴苯板对坝体进行长期保温和负温封拱灌浆，同时在基础混凝土中用内掺法掺１５％的ＦＮ－Ｍ型混凝土膨胀剂，有效地降低了作用于坝体的温度荷载。
The Honghe II arch dam is a bottomless thin-seam thin-arch dam built in a wide U-shaped river valley in the cold region. The single arch center-arc arch is used. The maximum dam height is 31m, the height-to-thickness ratio is 0.19, and the arc-height ratio is 7. 53. As the dam is located in the alpine mountainous area, the dam stress caused by temperature load accounts for 78% of the total load. It is the main load of the thin arch dam design in cold area. Therefore, in the dam design, the benzene board Long-term thermal insulation of the dam and closed arch grouting at negative temperature are carried out. Meanwhile, the FN-M type concrete expansion agent doped with 15% of the internal concrete is used in the foundation concrete, which effectively reduces the temperature load acting on the dam.