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级配是粗颗粒材料最基本特征,根据大量试验结果和长期积累的试验经验,总结出了试验级配缩制的具体原则,并基于粗颗粒材料中小于等于5 mm粒径含量变化,分析了级配优劣对其充填关系的影响,级配越优,粗颗粒材料的充填关系越好,粗颗粒材料能达到较大的干密度,反之则越差,粗颗粒材料也难以获得较大的干密度。级配的优劣对堆石料动力特性的影响在低围压状态下并不明显,随着围压的升高,级配优的堆石料动力特性指标明显变优;砂砾料由于颗粒浑圆度较好,级配的优劣对其动力特性的影响逐渐减弱。针对上述级配对粗颗粒材料动力特性的影响规律,对于高土石坝来说有必要采用级配优的粗颗粒材料作为坝体的填筑料,通过其在高应力条件下力学性能的优势来控制坝体整体变形和提高其抗震性能。
Gradation is the most basic feature of coarse particle materials. Based on a large number of experimental results and long-term accumulated experimental experience, the specific principles of experimental grading are summarized. Based on the change of particle size of less than or equal to 5 mm in coarse particles, Gradation with its filling relationship, the better the grading, the better the filling relationship between coarse particles, coarse particles can achieve greater dry density, and vice versa, the worse, it is difficult to get coarse particles of larger Dry density. The effect of grading on the dynamic characteristics of rockfill materials is not obvious under the low confining pressure condition. With the increase of confining pressure, the dynamic property index of graded rockfill material becomes obviously better. Well, the advantages and disadvantages of grading on its dynamic characteristics gradually weakened. In view of the influence of above gradation on the dynamic characteristics of coarse granular materials, it is necessary for coarse rock embankments to use coarse-grained material with good gradation as the filling material of the dam, which is controlled by its superiority in mechanical properties under high stress conditions The overall dam deformation and improve its seismic performance.