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为进一步了解混凝土的抗冻耐久性,分析了基于Loland混凝土损伤模型推导的混凝土冻融损伤模型,并结合试验数据拟合得到了混凝土弹性模量、泊松比与冻融循环次数的关系,利用ABAQUS分析混凝土重力坝渗流场、温度场,并以此确定了混凝土大坝发生冻融损伤的区域,最终采用场变量模拟重力坝随冻融次数增加的稳定性。结果表明,混凝土大坝并非所有区域均发生冻融损伤,且试验得到材料抗冻耐久性并不等同于混凝土重力坝抗冻耐久性。
In order to further understand the freeze-thaw durability of concrete, the model of freeze-thaw damage in concrete based on Loland concrete damage model was analyzed and the relationship between elastic modulus and Poisson’s ratio of concrete was obtained by fitting the test data. ABAQUS analyzes the seepage field and temperature field of the concrete gravity dam and determines the freeze-thaw damage area of the concrete dam. Finally, field variables are used to simulate the stability of the gravity dam with increasing number of freeze-thaw cycles. The results show that not all regions of the concrete dam freeze-thaw damage, and the durability of the material obtained by the freezing resistance is not the same as the concrete gravity dam anti-freeze durability.