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根据分形理论,推导了堆石料级配的分形分布公式。利用6座心墙坝和5座200 m级面板坝工程的现场级配检测资料进行验证,相关系数基本在0.95以上,吻合较好;相对于不均匀系数Cu和曲率系数C_c指标,粒度分形维数可以更客观地反映堆石料填筑级配平均特性;对英安岩、凝灰岩和混合岩等不同母岩特性的缩尺堆石料进行了室内干密度试验研究,同时结合水布垭等4座大坝原级配堆石料的检测资料,研究了级配(粒度分形维数)与压实干密度的关系,认为级配是影响堆石料压实性能的主要因素;利用粗粒土级配的Cu,C_c与分形维数的关系,首次提出了堆石料、过渡料等大粒径筑坝材料的良好级配范围,其粒度分形维数在2.22~2.63之间。研究结论可为堆石料的级配设计与优化提供依据。
According to fractal theory, the fractal distribution formula of rockfill material gradation is deduced. The test data of 6 core wall dams and 5 200 m panel dams are verified by on-site grading test. The correlation coefficient is basically above 0.95, which is in good agreement. Compared with the coefficient of nonuniformity Cu and curvature coefficient C_c, the particle size fractal dimension Can reflect the average characteristics of grading of the rockfill more objectively. The indoor dry density test of the scale-shrinkable rockfill material with different characteristics of the parent rock, such as dacite, tuff and mixed rock, is conducted. At the same time, Based on the test data of the original graded rockfill dam, the relationship between grading (granularity fractal dimension) and compacted dry density was studied. The grading was the main factor that affected the compaction performance of the rockfill material. , C_c and fractal dimension, the grading range of large-sized dam materials such as rockfill material and transition material is proposed for the first time with the fractal dimension of 2.22-2.63. The research conclusion can provide the basis for the grading design and optimization of rockfill materials.