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碾压混凝土开裂破坏是一个“损伤——开裂——裂缝扩展——断裂失稳”动态演变过程,为摸清其损伤断裂理与规,本文完成了12根实际坝体材料碾压混凝土三点弯曲梁试验,分析了强度等级、缝高比对碾压混凝土断裂特性影响.以材料静态断裂试验为础,通过研究声发射信号参量与动态荷载下裂缝扩展关系,到了动静态断裂韧度转化关系.最后利用有限元对武都重力坝裂缝在地震作用下开裂破坏进行分析,为实际坝体混凝土裂缝安全评价提供科学依据.
Crack damage of RCC is a dynamic evolution process of “damage-crack-crack extension-fracture instability”. In order to find out the rules and rules of damage and fracture, the paper has completed 12 examples of actual dam body material of roller compacted concrete Three-point bending beam test was used to analyze the influence of strength grade and seam height ratio on the fracture characteristics of RCC. Based on the static fracture test of material, the relationship between acoustic emission parameters and crack propagation under dynamic load was studied. The dynamic and static fracture toughness Finally, the finite element method is used to analyze the cracking of the cracks of the Wudu gravity dam under the action of the earthquake, which provides a scientific basis for the actual dam concrete crack safety assessment.