陕西水利Issue(2)：144-147,150,5.
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
王亚军 1罗志祥 2党方森 1强晟2
作者信息
- 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
- 折叠
摘要
Abstract
The concrete grade of the spillway section of a concrete gravity dam is generally relatively high,and the minimum 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 10m,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 similar projects.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Key words
Concrete gravity dam/High hydration hot concrete/Temperature stress/Temperature control and crack prevention/Simulation calculation分类
水利科学引用本文复制引用
王亚军,罗志祥,党方森,强晟..高热超宽复杂重力坝段温控防裂方案优化与应用[J].陕西水利,2025,(2):144-147,150,5.
