季节水温变化对充水保压蜗壳承载特性的影响
Effect of Seasonal Changes in Water Temperature on Load-bearing Mechanism of P-type Spiral Case Structure
郭冬云 1高晓峰2
作者信息
- 1. 中国电建集团中南勘测设计研究院有限公司,湖南长沙 410014
- 2. 长江科学院工程安全与灾害防治研究所,湖北武汉 430010;长江科学院水利部水工程安全与病害防治工程技术研究中心,湖北武汉 430010;长江科学院国家大坝安全工程技术研究中心,湖北武汉 430010
- 折叠
摘要
抽水蓄能电站钢蜗壳一般均采用充水保压埋入方式,在正常运行过程中,蜗壳内季节水温变化将影响钢蜗壳—混凝土接触关系,继而影响充水保压蜗壳的承载特性.为此,基于运行期钢蜗壳温度监测结果,研究了运行期钢蜗壳实际温度变化情况,并采用有限元方法研究了运行期钢蜗壳—混凝土接触关系的变化规律、结构承载特性及不平衡水推力分载情况.结果表明,在机组投产后正常运行年内,钢蜗壳内季节水温变化对钢蜗壳—混凝土接触闭合时机及空间分布影响显著;夏季水温升高将导致蜗壳外包混凝土承载比显著升高,应确保混凝土配筋满足强度和正常使用要求;而在冬季水温降低时止推环将起到承担不平衡水推力的主要作用,与此同时,座环也承担了约30％～40％的不平衡水推力,说明充水保压蜗壳设置止推环和加强座环锚固非常必要.
Abstract
P-type spiral case structure(SCS)is generally adopted in pumped-storage power plants.Under normal op-erating conditions,the contact status of steel spiral case(SSC)and surrounding concrete is subject to seasonal changes in water temperature of SSC.Accordingly,it will affect the load-bearing mechanism of the SCS.Based on in-situ measured data of the temperature,seasonal changes in temperature of SSC were analyzed.Furthermore,the contact behavior,load-bearing mechanism of SCS and share of unbalanced hydraulic thrust were studied with FEA.The results show that the seasonal changes in water temperature of SSC will affect the gap-closing behavior of the SSC-concrete contact.In sum-mer,the rise in water temperature will increase the bearing ratio of the surrounding concrete.Moreover,the thrust ring is more prominent in winter,and the stay ring actually shares about 30％-40％of the unbalanced hydraulic thrust.Ac-cordingly,the design of the thrust ring and the anchoring of the stay ring are necessary.
关键词
抽水蓄能电站/充水保压蜗壳/季节水温变化/钢蜗壳—混凝土接触关系/不平衡水推力Key words
pumped storage power plant/P-type spiral case structure/seasonal changes in water temperature/SSC-concrete contact/unbalanced hydraulic thrust引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据