极端天气对于溢流坝段温度与应力影响分析  

Influence of extreme weather on temperature and stress field of overflow dam section

作　　者：郑峥 ZHENG Zheng(Anhui Survey And Design Institute of Water Resource and Hydropower Company Limited,Hefei 230088,China)

机构地区：[1]安徽省水利水电勘测设计研究总院有限公司,合肥230088

出　　处：《水科学与工程技术》2024年第1期40-43,共4页Water Sciences and Engineering Technology

摘　　要：以某水电站为对象,采用数值模拟的方式,模拟了大坝在常规运行期和极端天气下的温度场和应力场分布。研究表明:在常规运行期中主要是夏季大坝温度应力较大,其中变电洞左侧顶部区域的拉应力最大,达2.64 MPa,超过混凝土抗拉强度。在极端天气影响下,高温和泄水的条件下,此处的拉应力将进一步提高,达2.93 MPa,极易产生裂缝。冬季寒潮对于大坝表面混凝土的温度和应力影响较大,其中反弧段附近的混凝土拉应力从1.6 MPa增至4.0 MPa,超过抗拉强度。因此极端天气加剧了温度变化对于大坝的影响,主要改变大坝表面温度场的分布,形成更大的温度应力,危害结构安全,需得到足够重视。The distribution of temperature and stress field of a hydropower station is simulated by numerical simulation during normal operation and extreme weather condition.The research results show that the thermal stress of the dam is greater in the normal operation period,especially in the summer,and the tensile stress in the top area on the left side of the substation tunnel is the largest,reaching 2.64 MPa,which exceeds the tensile strength of concrete.Under the influence of extreme weather,under the conditions of high temperature and water discharge,the tensile stress here will be further increased,reaching 2.93 MPa,which is easy to produce cracks.The cold wave in winter has a great influence on the dam surface,and the tensile stress of concrete near the anti-arc section increases from 1.6 MPa to 4.0 MPa,which exceeds the tensile strength.Therefore,extreme weather exacerbates the effect of temperature change on the dam,mainly changing the distribution of the surface temperature field of the dam,and forming larger temperature stress,which endangers the safety of the structure and needs sufficient attention.

关 键 词：数值模拟 温度应力 极端天气 溢流坝 

分 类 号：TV652.1[水利工程—水利水电工程]