严寒地区某碾压混凝土坝稳定温度场仿真计算

Simulation and Calculation of Stability Temperature Field of a Roller Compacted Concrete Dam in Cold Region

某碾压混凝土坝地处北方寒冷地区,冬季温度低,夏季温度高,气温年内变幅大,日气温变幅大,寒潮频繁且降温大,对大坝的温控防裂极为不利。为了研究混凝土坝温度应力的分布规律,进而提出满足温控防裂的温控标准和相应的防裂措施,选择主河床最高典型挡水坝段、典型溢流坝段、典型发电引水坝段以及典型底孔坝段混凝土作为重点研究对象,根据热传导理论和有限元方法,采用水温统计的成果进行温度场仿真计算,结果表明大坝的稳定温度为7~9℃。

There is a roller compacted concrete dam in north cold area, in which the winter temperature is low, the summer temperature is high, the amplitude of temperature within a year is large, the amplitude of temperature within a day is large too, the cold is frequently and the cooling amplitude is large. The dam temperature control and crack prevention is extreme- ly unfavorable. In order to study the distribution of concrete dam temperature stress and then put forward to the temperature control standards meeting the temperature control and crack prevention and the corresponding prevention measures, the concrete of typical dam section, typical overflow dam section, typical power diversion dam and typical dam section is selected as the research object. With the heat conduction theory and finite element method, the temperature field is simulated using the results of water temperature statistics. The results show that the stability of the dam temperature is about 7 to 9 ℃.