高碾压混凝土重力坝通水冷却优化设计与工程实践

Optimization Design of Pipe Cooling of High Roller-compacted Concrete Gravity Dam and Its Engineering Practice

在归纳总结大体积碾压混凝土温控防裂技术要点的基础上,从放宽基础温差、增加间歇式中期冷却、施工期水管冷却五参数控制、冷却结束标准确定四个方面出发,阐述了高碾压混凝土重力坝通水冷却设计的优化方法。以官地水电站为例,对水管冷却方案做了改进,并基于跟踪监测数据与数值计算结果,实时调整设计参数。结果表明,官地水电站大坝混凝土的温控效果较好,各项应力指标满足蓄水安全要求,且整个施工期至运行初期未出现危害性的裂缝,为类似工程提供了借鉴。

Some temperature control and crack prevention technologies of the mass roller-compacted concrete are summarized in this paper.The optimization analysis method of the pipe cooling of high roller-compacted concrete gravity dams is analyzed on the basis of the four aspects：relaxing the foundation temperature difference,increasing the middle-stage cooling,five parameters control of pipe cooling in construction,the determination of ending standards for pipe cooling.The Guandi hydropower station is selected for this study,and the cooling schemes are improved.According to the monitoring data and numerical calculation results,the design parameters are adjusted in time.The results show that the temperature control effect of Guandi dam is good;all stress indicators could meet the safety requirements of the reservoir impoundment,and there is no harmful crack during the whole construction period and the initial operating period,which could provide references for the similar projects.