论文部分内容阅读
结合呼和浩特抽水蓄能电站拦沙坝的三维有限元分析,探究严寒地区碾压混凝土坝第一个越冬期温度场和温度应力场分布规律,确定坝体中期通水重点关注区域和需要通水区域;分析中期通水对碾压混凝土坝体温度场和温度应力场的影响规律,确定对坝体的几个重要影响因素,并重点探讨中期通水对坝体冬季表层混凝土温度应力的改善情况;在此基础上,改变中期通水初始时间和通水降温速率,对比各种工况下中期通水对碾压混凝土坝表层混凝土以及内部碾压混凝土的影响作用,从而得出一套较为合理高效的中期通水方案,对其他严寒地区碾压混凝土坝越冬期温控防裂提供一定的借鉴作用.
Combined with the three-dimensional finite element analysis of Hohhot pumped storage power station dam, the distribution law of temperature field and temperature stress field of RCC dam during the first wintering period in severe cold area is explored, and the key areas of attention and the area needing water flow The influences of medium-term water flow on the temperature field and temperature stress field of RCC dam were analyzed, and several important influencing factors on the dam body were determined. The improvement of temperature stress of surface concrete in winter by medium-term flood control was also discussed emphatically. On this basis, changing the initial time of medium-term water flow and cooling rate of water through water, compared the effect of medium-term water supply under various operating conditions on the surface concrete and internal roller compacted concrete of RCC dam, then obtained a set of more reasonable and efficient Of the medium-term water program, on the other RCC dam over winter temperature control cracking provide a reference.