摘要
碾压混凝土是一种干硬性混凝土,施工时是薄层碾压、连续浇筑,温度应力是其产生裂缝的一个主要荷载。不同于常规的碾压混凝土重力坝,抽水蓄能电站大坝典型的特点是水位变幅大,变水位区混凝土表面会经常出现不同的温度边界条件交替现象,表面应力情况更加复杂。针对这一问题,以周宁抽水蓄能电站为例,结合三维有限单元法,研究大坝碾压混凝土施工期的温控方案和运行期变化水位下的温度应力。计算结果表明,在合理的浇筑温度、浇筑季节和通水冷却措施下,施工期温控方案可以满足工程要求,运行期的水位变化也不会在水位变化区引起较大的应力变化。研究成果可以指导现场施工,并对类似工程建设提供一定参考依据。
Roller compacted concrete(RCC)is a kind of dry hard concrete,which is rolled in thin layers and continuously poured during construction.Temperature stress is one of the main loads that cause cracks.Different from conventional RCC gravity dams,the typical feature of pumped storage power station dams is that the water level changes greatly.The alternating phenomenon of different temperature boundary conditions often occurs on the concrete surface in the variable water level area,and the surface stress is more complex.In view of above mentioned condition,taking Zhouning Pumped Storage Power Station as an example,combined with the three-dimensional finite element method,the temperature control plan during the construction period of the dam's RCC and the temperature stress under the changing water level during the operation period are studied.The calculation results show that under reasonable pouring temperature,pouring season and water cooling measures,the temperature control scheme during the construction period can meet the engineering requirements,and the water level change during the operation period will not cause large stress changes in the water level change area.The research results can guide the on-site construction and provide a certain reference basis for the construction of similar projects.
作者
康志亮
李龙龙
刘东旭
王振红
汪娟
KANG Zhiliang;LI Longlong;LIU Dongxu;WANG Zhenhong;WANG Juan(Fujian Branch of China Huadian Group Co.,Ltd.Fuzhou,Fujian 350013,China;Huadian Fuxin Zhou Ning Pumped Storage Co.,Ltd.Ningde,Fujian 352100,China;Department of Structures and Materials,China Institute of Water resources and Hydropower Research,Beijing 100038,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2021年第4期92-98,共7页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家重点研发计划项目(2018YFC0406700)
国家自然科学基金项目(51779277)
中国水科院科研专项(SS0145B712017,SS0145B612017,SS0145B392016)。
关键词
碾压混凝土重力坝
抽水蓄能
变化水位
施工期
运行期
温度应力
RCC gravity dam
pumped storage
changing water level
construction period
operation period
temperature stress
