某碾压混凝土重力坝施工温控措施研究

在碾压混凝土坝施工和运行期间防止裂缝的产生是需要考虑和控制的重要问题,对具体温控措施进行研究可为以后提供重要的技术指导。以某碾压混凝土重力坝工程为例,利用大型有限元软件ANSYS进行建模,采用三维有限元浮动网格法模拟碾压混凝土坝的施工过程,根据工程施工进度和碾压混凝土的热力学参数,针对浇筑温度、通水冷却措施,初拟了3个温控方案,对各个方案的温度场和应力场进行计算分析。结果表明:高温季节进行混凝土浇筑对坝体温度和应力影响较大,极容易造成裂缝;通过控制浇筑温度和通水冷却措施,坝体最高温度得到了有效的降低,最大应力基本满足碾压混凝土坝容许应力要求。此研究成果可为类似工程的温控设计提供参考。

Research on temperature control measures in construction of a roller-compacted concrete gravity dam

During the construction and operation of roller-compacted concrete (RCC) gravity dam, to control the generation of cracks is a key problem to consider. The study of specific temperature control measures can provide a important technical guidance for the future. Taking an instance of a RCC gravity dam project, the large-scale software ANSYS was used to establish models, and the three-dimensional finite element relocating mesh method was used to simulate the RCC dam construction process. According to the project construction progress and thermodynamic parameters of the compacted concrete, against the measures of pouring temperature and water cooling, three temperature control schemes were proposed preliminary, and the temperature and stress of each scheme were analyzed. The results showed that, in the high temperature seasons, to pour concrete had greater influences on the temperature and stress of the dam body, which easily induced cracks. By controlling the measures of pouring temperature and cooling with water, the maximum temperature decreased effectively, and the dam maximum stress met the requirement of permitted stress for roller-compacted concrete dam.This research can provide references for the temperature control designs of similar projects.