Abstract: Based on the theory of fracture mechanism applied in finite element method, friction characteristics of the horizontal cracks in concrete gravity dam body were simulated and analyzed, and the mechanical properties of crack tip and variation laws of dam displacement and stress state with different friction coefficients were concluded in detail. The results showed that, regardless of dam crack or the whole dam, there were abrupt changes of the mechanical properties of dam and crack in some interval, and it was important to pay attention to the phenomena in dam safety monitoring. The study in this paper can provide guide in the monitoring of concrete dams with some cracks during operation, and provide a basis for dam rehabilitation.

摘要： 基于断裂力学理论并结合有限元方法，对混凝土重力坝坝身水平裂缝的摩擦特性进行了数值模拟及分析，得到了不同摩擦水平下裂缝尖端力学特性及坝体位移、应力状态的变化规律。计算结果表明，无论是对裂缝本身还是对整体大坝，裂缝摩擦系数在某个区间上的变化都使得裂缝和坝体的力学特性存在着突变，这在坝体安全监测上值得关注。本文研究成果可为带缝混凝土坝运行期间的监测提供方向，为坝体裂缝加固提供依据。