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为研究冻融对胶凝砂砾石坝正常运行造成的影响,以守口堡胶凝砂砾石坝为研究对象,结合胶凝砂砾石结构冻融损伤特性,建立三维有限元冻融损伤模型,对坝体运行期不同工况下的温度、应力及损伤状况进行仿真分析。结果表明,普通胶凝砂砾石除易冻融破坏外,还易发生拉裂破坏;添加外加剂后抗冻性提高,但还不足以抵抗冻融;“金包银”措施能够有效改善坝内胶凝砂砾石的温度、应力状况,使其免受冻融影响,保证永久性水工建筑物运行期安全稳定。
In order to study the effect of freeze-thaw on the normal operation of the cement-sand gravel dam, this paper studied the effect of freeze-thaw on the freeze-thaw damage characteristics of the cement-gravel gravel structure, Body operating conditions under different conditions of temperature, stress and damage status simulation analysis. The results show that ordinary gelling gravel is not only easy to freeze-thaw damage, but also prone to fracture and rupture; frost resistance is increased after addition of additives, but not enough to resist freezing and thawing; The temperature and stress of the inner gelling gravel will be protected from freezing and thawing so as to ensure the safe and stable operation of the permanent hydraulic structures.