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研究了碎石散粒体材料极限二次松散系数的测定方法并设计了测试装置。试验分析了不同粒径、颗粒形状、不同含水率、含泥量及级配对散粒体材料极限二次松散系数的影响。试验表明,随着碎石散粒体材料粒径的增大,极限二次松散系数呈现先增大后减小的趋势,且相同粒径的碎石相比卵石具有更好的松散能力。随着含水率的增大,碎石散粒体材料的极限二次松散系数先下降后增加。含泥量对碎石散粒体材料的影响很大,尤其是对于小粒径的碎石散粒体材料。级配碎石散粒体材料的松散性较单一粒径的松散性差。
The method of measuring the limit quadratic relaxation coefficient of crushed granular materials was studied and the testing device was designed. The influence of different particle size, particle shape, different water content, clay content and gradation on the ultimate quadratic loosening coefficient of the material was analyzed experimentally. The experimental results show that with the increase of particle size of the gravel, the limiting quadratic loosening coefficient increases firstly and then decreases, and the gravel with the same particle size has better looseness than the pebble. With the increase of water cut, the limiting quadratic loosening coefficient of gravel material first decreases and then increases. Mud content on the gravel bulk material impact, especially for the small size of the gravel bulk material. Loose graded granular material than the looseness of a single particle size.