严寒地区碾压混凝土坝温控防裂中期通水影响因素分析

Analysis of influence factors on RCC dam metaphase water-cooling of temperature control and crack prevention in cold regions

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,this article explores the first wintering temperature and stress distribution of cold regions,which determines the focus area and the area that need to flow water.At the same time,it analyzes the influence of metaphase watercooling to the dam temperature field and thermal stress field,which also focuses on the temperature and the stress decrease of RCC dam in the winter.On this basis,through changing the start time and the water cooling rate and comparing different conditions,it arrives at a more rational and efficient plan of metaphase water-cooling,which can be taken as a reference for the similar projects.