| 基于断裂力学和有限元的碾压混凝土坝劈头裂缝扩展的应力计算研究 |
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| 引用本文： | 毛海涛,;王晓菊,;张学林,;姜海波.基于断裂力学和有限元的碾压混凝土坝劈头裂缝扩展的应力计算研究[J].地震学刊,2014(6):764-770. |
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| 作者姓名： | 毛海涛 ;王晓菊 ;张学林 ;姜海波 |
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| 作者单位： | [1]重庆三峡学院土木工程系,重庆万州404100; [2]石河子大学水利与建筑工程学院,新疆石河子832000 |
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| 基金项目： | 国家自然科学基金项目（51309262;51269029）;重庆市教委科学技术项目（KJ121104）;重庆三峡学院重点项目（12ZD20）资助 |
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| 摘 要： | 混凝土坝的劈头裂缝属于断裂力学中描述的张开型（I型）裂缝。劈头裂缝应力计算中,强度因子KI和材料开裂韧度KIC是判断劈头裂缝扩展的关键参数。采用断裂力学的基本理论推导裂缝应力计算的基本公式,并借助有限元来确定强度因子和材料开裂韧度,对寒冷地区实际工程坝体裂缝进行计算,得出运行期4日型寒潮期和不同运行时段的温度裂缝长度和强度因子。通过对比发现,计算结果与大坝运行期不同工况裂缝的实际情况相符合,验证了方法的正确性。
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| 关 键 词： | 断裂力学 混凝土坝 裂缝应力 有限元分析 |
Study on a Method for Calculating the Stresses of Concrete Dam Upstream Vertical Cracks Extending Based on Fracture Mechanics and FEM |
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| Institution: | MAO Hai-tao,WANG Xiao-iu,ZHANG Xue-lin,JIANG Hai-bo(1. Department of Civil Engineering, College of Chongqing Three Gorges, Wanzhou 404100, China 2. College of Water Conservancy and Civil Engineering of Shihezi University, Shihezi 832000, China) |
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| Abstract: | Upstream vertical cracks of concrete dam belong to the open type of fracture mechanics（I）fracture.Cleavage cracks′intensity factor（KI）and fracture toughness（KIC）are the key parameters to judge the vertical cracks′extending.This article uses the basic theory of fracture mechanics to deduce them,and uses finite element to confirm the intensity factors and fracture toughness and calculates them by the actual engineering.Dam construction and operation are consistent with the actual situation.Calculation method of dam abutment crack parameters here can provide scientific basis for the safety evaluation of dams. |
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| Keywords: | fracture mechanics concrete dam cracks stress FEM analysis |
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