卡洛特水电站闸墩混凝土绝热温升反演及温控优化

Adiabatic temperature rise inversion and temperature control measures optimization of spillway pier in Karot Hydropower Station

巴基斯坦卡洛特水电站溢洪道混凝土采用普通硅酸盐水泥配制,现场实测资料表明,实际施工配合比条件下闸墩混凝土的自身发热量偏高偏快,对抗裂安全不利。考虑到当地现场不具备混凝土绝热温升试验条件,为充分掌握闸墩混凝土实际发热特点,采用三维有限单元法实际模拟溢洪道混凝土施工浇筑过程,进行施工期温度场仿真分析。采取自适应遗传算法根据现场实际条件和监测数据反演真实的混凝土绝热温升参数,并以此为依据对闸墩混凝土温控措施进行了优化和调整。三维有限元温度场仿真计算结果表明,采用优化调整过的温控措施以后,混凝土发热量得到控制,闸墩部位最高温度可满足设计允许最高温度控制标准。

Spillway concrete of Karot Hydropower Station in Pakistan was formulated with ordinary Portland cement.According to the concrete temperature monitoring data,the concrete is characterized by quick heating and the heating value is high under the actual construction mix proportion,which is adverse to crack prevention.Considering the lack of test conditions for in-situ concrete adiabatic temperature rise and tin order to master the actual heating characteristics of the pier concrete,three-dimensional finite element method was used to simulate the concrete pouring process and the temperature field of the Karot spillway.The adaptive genetic algorithm was adopted to retrieve the actual adiabatic temperature rise parameters of the concrete based on the actual conditions and monitoring data.Based on this,the temperature control measures of the pier concrete were optimized and adjusted.The simulation results showed that the maximum temperature of the pier can meet the design maximum temperature control standard after using the optimized temperature control measures,which provides a reference for construction.