PDF(Pubmed)
Abstract：
The cracking problem of asphalt concrete panels is a crucial consideration in the design of hydraulic asphalt concrete seepage control bodies. Panels experiencing uneven rises or falls of water levels during impoundment may exhibit loading rate effects. Investigating the fracture toughness value of asphalt concrete under varying loading rates is essential. This study employs a statistical method to calculate the fracture index KIC, using the semi-circular bending test (SCB) to examine the effect of loading rates on the Type I fracture mode of hydraulic asphalt concrete. The data are analyzed using the two-parameter Weibull distribution curve, offering insights into the minimum number of KIC test specimens. The results indicate an increase in KIC with loading rate, with greater data dispersion at faster rates. The Weibull distribution curve successfully fits the fracture behavior under different loading rates, providing valuable predictions. This study estimates the minimum number of SCB test specimens to be nine, based on a confidence level of 0.95 and a relative deviation not exceeding 5%.
摘要：
沥青混凝土面板的开裂问题是水工沥青混凝土防渗体设计中的重要考虑因素。蓄水期间水位不均匀上升或下降的面板可能会产生加载率影响。研究沥青混凝土在不同加载速率下的断裂韧性值至关重要。本研究采用统计学方法计算断裂指数KIC,使用半圆形弯曲试验（SCB）来检查加载速率对水工沥青混凝土I型断裂模式的影响。采用双参数威布尔分布曲线对数据进行分析,提供对KIC试样的最小数量的见解。结果表明KIC随加载速率而增加，以更快的速度获得更大的数据分散。Weibull分布曲线成功地拟合了不同加载速率下的断裂行为，提供有价值的预测。这项研究估计SCB测试样本的最小数量为9，基于0.95的置信水平和不超过5%的相对偏差。
