冷却水管位置对碾压混凝土拱坝温度场的影响

Influencc of differ pipe cooling scheme for temperature distribution in RCC arch dams

依据碾压混凝土坝的材料特性,考虑混凝土的绝热温升随龄期的变化和分层浇筑、夏季停工、外界气温变化、表面保温及蓄水等因素,采用三维有限元浮动网格法对碾压混凝土拱坝在不同部位布置冷却水管的方案进行了施工期至运行期温度场全过程仿真分析。计算结果证明:冷却水管布置范围从 1299m～ 1327m变为 1275m～ 1293m,冷却水管的布置范围减小,坝中心所出现的最大温度值明显降低,冷却作用显著。

Based on the physical properties of rolled compacted concrete arch dam,three-dimensional finite element relocating mesh method is used to simulate the temperature distribution for differ pipe cooling scheme in the RCC arch dam during construction and operation period in this paper.Many factors also have been considered,such as thermal adiabatic rise of temperature with age,the progress of pouring by layer,work suspension in summer,the change of air temperature,heat preservation and water storage on temperature field.The calculating results show that the cooling effect is notable and the maximum temperature is decreasing greatly in the center of the dam when the pipe cooling laid in the range changed from 1 299 m～1 327 m to 1 275 m～1 293 m.