石漫滩碾压混凝土重力坝温度效应分析

温度是混凝土坝的主要荷载之一,不利的温度荷载导致坝体产生裂缝,特别在运行期,不利水压荷载与温度荷载的组合使得裂缝进一步扩展,严重危害大坝安全运行。石漫滩碾压混凝土重力坝裂缝严重,尤其是部分坝段存在有规律的横向裂缝。现采用大型通用有限元软件ANSYS,依据石漫滩水库的水温和气温等监测资料,分析了大坝运行期的温度场和温度应力场,从温度效应角度揭示了该坝横向裂缝产生和发展的主要原因及其危害,为大坝加固处理提供技术支撑。

Analysis of Temperature Effects of Shimantan RCC Gravity Dam

Temperature is one of the main loads of concrete dam, and the adverse temperature load can cause cracks in the dam, especially during the operation period, the combination of unfavorable hydraulic pressure load and temperature load can expand the cracks, resulting in the damage for the dam safety operation. The Shimantan RCC gravity dam has serious cracks, and regular transverse cracks occur in several sections of the dam. Based on the observed water temperature and air temperature data of the Shimantan reservoir, the large general finite element software ANSYS was used to analyze the temperature field and temperature stress field of the dam during the operation period, and to illustrate the main reasons of the occurrence and development of the transverse cracks in aspect of temperature effects, which can provide technical support for reinforcement of the dam.