白鹤滩水电站导流洞衬砌混凝土温控限裂技术研究

发布时间：2018-05-08 09:42

本文选题：导流洞 + 衬砌混凝土　；参考：《水电能源科学》2017年05期

【摘要】：温度裂缝严重影响水工衬砌结构的耐久性和安全性。白鹤滩水电站导流洞导流任务重、使用时间长、尾水段与尾水洞结合为永久结构。为限制温度裂缝,使用低热水泥、预冷混凝土、通水冷却、冬季挂帘等综合温控措施,使混凝土裂缝大幅减少。通过统计现场监测数据及裂缝特征,论证了温控措施的合理性,分析了裂缝的一般规律。利用有限元法分析裂缝影响因素的敏感性,结果表明,大量裂缝出现在冬季昼夜温差变化较大时;低温季节当气温变化幅度较小,选择自然入仓也能满足温控要求;断面尺寸越小、分仓长度越短、分期施工对限制混凝土裂缝有利;围岩越完整,约束作用越强,衬砌混凝土开裂风险越大。研究成果可为类似工程提供参考和借鉴。
[Abstract]:Temperature cracks seriously affect the durability and safety of hydraulic lining structure. The diversion tunnel of Baihetan Hydropower Station has a heavy diversion task and a long service time, and the tail water section is combined with the tail water tunnel to form a permanent structure. In order to limit the temperature crack, low heat cement, precooling concrete, cooling through water, hanging curtain in winter and other comprehensive temperature control measures are used to reduce the cracks of concrete. The rationality of the temperature control measures and the general rules of the cracks are demonstrated through the statistics of the field monitoring data and the fracture characteristics. The sensitivity of influencing factors of cracks is analyzed by finite element method. The results show that a large number of cracks occur when the temperature difference between day and night is large in winter, and when the temperature changes are small in the low temperature season, the choice of natural silo can also meet the requirements of temperature control. The smaller the section size, the shorter the length of the storehouse, the more favorable to restrict the concrete crack by stages construction; the more complete the surrounding rock, the stronger the restraint action, the bigger the risk of cracking of lining concrete. The research results can provide reference for similar projects.
【作者单位】：中国三峡建设管理有限公司;
【分类号】：TV551.1+2

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