高热超宽复杂重力坝段温控防裂方案优化与应用  

Optimization and Application of Temperature Control and Crack Prevention Scheme for High-Temperature Ultra-Wide Complex Gravity Dam Sections

作　　者：王亚军 罗志祥 党方森 强晟 Wang Yajun;Luo Zhixiang;Dang Fangsen;Qiang Sheng(Henan Water Conservancy Engineering First Group Co.,Ltd.,Zhengzhou 450016,Henan;College of Water Conservancy&Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu)

机构地区：[1]河南省水利第一工程局集团有限公司,河南郑州450016 [2]河海大学水利水电学院,江苏南京210098

出　　处：《陕西水利》2025年第2期144-147,150,共5页Shaanxi Water Resources

摘　　要：混凝土重力坝泄水坝段的混凝土标号一般相对较高、最低水泥用量较大,导致混凝土施工期产生大量的水化热,且不同结构部位混凝土标号差异较大,物理力学性能差异大,相互约束强。由于各浇筑块的尺寸较大,混凝土内部的热量难以释放,在约束的作用下,易产生较大的温度应力,不利于施工期温控防裂工作。为研究这种情况下合理的温控方法 ,以某在建重力坝为依托,建立三维有限元计算模型,分析高热超宽复杂重力坝温度场及应力场的特点,模拟分不同温控防裂方案对约束区、非约束区浇筑块温度和应力场的影响。结果表明,通水冷却削峰力度越大,温降速率越小,浇筑块内部拉应力增幅越小;设施工缝分块,减小浇筑块长边尺寸至10 m是最有效措施,可将拉应力控制在2.7 MPa。在以上措施的综合作用下,仅坝体表面部分区域拉应力略超过3 MPa,总体可以避免内部裂缝,研究成果可为类似工程施工期温控方法提供参考。The concrete grade of the spillway section of a concrete gravity dam is generally relatively high,and the ninimum cement dosage is large,which leads to a large amount of hydration heat generated during the construction period of the concrete.In addition,the concrete grades of different structural parts vary greatly,and the physical and mechanical properties vary greatly,with strong mutual constraints.Due to the large size of each casting block,the heat inside the concrete is difficult to release.Under the action of constraints,it is easy to generate large temperature stress,which is not conducive to temperature control and crack prevention during the construction period.In order to study the reasonable temperature control method under this situation,a three-dimensional finite element calculation model was established based on a gravity dam under construction.The characteristics of the temperature field and stress field of the high-temperature ultra-wide complex gravity dam were analyzed and studied,and the influence of different temperature control and crack prevention schemes on the temperature and stress field of the casting blocks in the constraint area and the non-constrained area was simulated.The results show that the greater the peak cutting force of water cooling,the smaller the temperature drop rate,and the smaller the increase in tensile stress inside the casting block;the most effective measure is to divide the construction joints and reduce the long side size of the casting block to 1Om,which can control the tensile stress at 2.7 MPa.Under the combined effect of the above measures,the tensile stress in only some areas of the dam surface slightly exceeds 3 MPa,and internal cracks can be avoided overall.The research results can provide a reference for temperature control methods during the construction period of similarprojects.

关 键 词：混凝土重力坝 高水化热混凝土 温度应力 温控防裂 仿真计算 

分 类 号：TV642.3[水利工程—水利水电工程]