丹达河水电站拱坝混凝土垫座温控方案比较研究

Comparative Study of Temperature Control Schemes for Concrete Pedestal of Arch Dam at Dandahe River Hydropower Station

西南地区某水电站拟修建拱坝,为改善地基质量,保证拱坝结构安全,在3号坝段和4号坝段底部设置了混凝土垫座结构.针对该水电站混凝土垫座结构,基于有限元方法,利用ANSYS软件建立混凝土垫座计算模型,使用ANSYS二次开发程序,对垫座混凝土进行了多组温控参数敏感性分析,并结合规范规定的温度控制标准,最终确定最优温控措施.仿真分析结果表明,采取最优温控措施能有效降低施工期混凝土内部的温度应力,减少混凝土开裂的风险,提高结构的安全性.为相似工程温控方案的选择提供参考.

An arch dam is planned to be built in Southwest China. A concrete pedestal should be set under the bottom of dam sections 3 and 4 to improve the quality of the foundation as well as ensure the structural safety of dam. Based on the finite element method, ANSYS software is used to establish a concrete pedestal model. Using ANSYS secondary development program, sensitivity analysis of multiple temperature controlling parameters of concrete pedestal is done. The optimal temperature control measures are also decided according to the corresponding specification. Simulation results show that the optimal temperature control measures can effectively reduce the temperature stress in concrete and reduce risks of concrete cracking and improve safety of the structure, so as to provide reference for similar engineering in temperature control scheme selection.