严寒干旱地区RCC重力坝的保温防裂措施

针对某严寒干旱地区RCC重力坝所在地"冷、热、风、干"的气候特点,分析了温度裂缝产生的原因,并主要从加强混凝土的表面保温着手,结合工程实际,利用有限元法进行坝体表面温度和温度应力的仿真分析。研究表明:表面保温是防止混凝土产生裂缝的有效措施之一;根据现场施工条件,采取对已浇筑的坝体表面粘贴5 cm厚XPS板并回填土进行保温的综合表面保温措施。

Research on the heat preservation and crack-prevention measures for RCC gravity dam in severly cold and dry area

The reason for the temperature crack of the RCC gravity dam sited in a high,cold area with a cold,hot,windy and dry climate is analyzed in this study.Combined with practical engineering,a finite element simulation analysis of surface temperature and temperature stress of the RCC dam with strengthening surface heat preservation is made.The results show that the surface thermal isolation can be considered as one of the best methods of concrete cracks prevention.According to on-site construction condition,the poured dam body is plastered with 5 centimeter-thick XPS boards and backfilled with soil on the surface to achieve comprehensive surface thermal isolation.