摘要
高寒地区气候变化复杂,对混凝土大坝的施工和运行极为不利,特别是在极端温度运行水、冰拔荷载的作用下,极易产生开裂渗漏、冻胀、损伤等破坏,表面防护是目前解决这一问题的有效手段。针对上述问题,为提高大坝结构耐久性及安全性,研究了适应高寒环境的脲基聚合物表面防护材料体系,包括SPUA-SKJ-Ⅱ脲基聚合物涂层材料、SKJ-001和SKJ-002水工专用底漆材料、SKJ-OS抗冰拔材料等。室内试验及现场实践的结果表明,研发的脲基聚合物体系在复杂的施工环境下粘接性能均大于2.5 MPa,能够适应低温、潮湿、灰尘等恶劣的水利工程施工环境,解决了传统防渗材料对基面及施工环境要求高的问题;体系材料具有抗拉强度高、裂缝追随性强、防渗抗冻融效果好、耐老化、施工工艺简单等优点。该表面防护体系技术在高寒高纬度地区黑龙江奋斗水库的应用,弱化了施工期温控及保温措施,降低了施工成本,经3 a运行效果良好,为类似工程提供成功案例。
Climate change in alpine region is complicated,which is quite unfavorable to the construction and operation of concrete dam,and then the damages,i.e.,cracking,leakage,frost-heaving,etc.are quite prone to be caused especially under the effects of the operation water with extreme temperature and ice pulling load;for which the surface protection is the effective means to solve this problem at present.Aiming at the problems mentioned above,an urea-based polymer surface protection material system adaptable to the high-cold environment is studied herein,which includes SPUA-SKJ-Ⅱ urea-based polymer coating materials,SKJ-001 and SKJ-002 special primer material for hydraulic engineering,SKJ-OS anti-ice-pulling material,etc.,so as to enhance the durability and safety of the dam structure.The results from indoor experiment and in situ practice show that the adhesive properties of the developed urea-based polymer system in complex construction environment are more than 2.5 MPa,which can adapt to the construction environment of low temperature,humidity,dust and other harsh water conservancy projects,and solve the problem of high requirements for the base surface and construction environment of traditional anti-seepage materials.The materials of this system have the merits of high tensile strength,strong crack-followability,better effects of anti-seepage and anti-freeze-thaw,aging resistance,simple construction technology,etc.The application of this surface protection system to Fendou Reservoir in Heilongjiang Province within alpine high altitude region does not only weakens the temperature control and insulation measures during the construction period,but also reduces the construction cost concerned.The effect of the system is demonstrated to be better after the operation of three years,thus provides a successful case for the similar project concerned.
作者
刘小楠
李炳奇
冯明伟
刘顺萍
裴成元
赵向波
LIU Xiaonan;LI Bingqi;FENG Mingwei;LIU Shunping;PEI Chengyuan;ZHAO Xiangbo(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;China Gezhouba Group No.2 Engineering Co.,Ltd.,Chengdu 610091,Sichuan,China;China Water Resources Beifang Investigation,Design and Research Co.Ltd.,Tianjin 300222,China;Xinjiang Irtysh River Basin Development Administrative Bureau,Urumchi 830002,Xinjiang,China)
出处
《水利水电技术（中英文）》
北大核心
2021年第8期27-37,共11页
Water Resources and Hydropower Engineering
基金
国家重点研发计划(2018YFC0406700)
中国水科院专项(SS0145B492019)。
关键词
高寒地区
奋斗水库
防渗防护
脲基聚合物体系
混凝土
水利工程
抗冻性能
alpine region
Fendou Reservoir
anti-seepage protection
urea-based polymer system
concrete
water conservancy project
frost resistance
