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针对建筑渣土这种粒径分布广,并可发生二次破碎的特殊混合料,为了评价其作为路基填料的潜在性,首次对这种材料的工程特性进行较系统的室内试验研究。根据该材料的颗粒组成、组分特性确定其工程类别,接着对这种以粗颗粒为主的材料的试验要点进行总结,并对该材料的击实特性,振动压实特性和室内CBR强度等性质进行分析。结果表明:混合料的最大干密度并非随粗颗粒掺量的增大而增大,而是存在一最优掺量;击实法得到最大干密度明高低于振动台法,主要原因是该性质材料在击实过程中破碎率高,原来不良的级配得到显著改善所致,这与试验路填筑中的现象相似;该材料室内CBR强度高,水稳定性好,能满足路基填料对该指标的要求。
In order to evaluate the potential of subgrade as a kind of special mixture with wide particle size distribution and secondary crushing, it is the first time to study the engineering characteristics of this kind of material systematically in laboratory. According to the particle composition of the material, component properties to determine the type of engineering, and then the coarse particles of the main test materials summarized, and the compaction of the material properties, vibration compaction properties and indoor CBR strength Nature of the analysis. The results show that the maximum dry density of the mixture does not increase with the increase of the coarse particles, but there is an optimal content. The maximum dry density obtained by the compaction method is lower than that of the shaker method, mainly due to the nature The material has high crushing rate during the compaction process, and the originally poor gradation is significantly improved, which is similar to the phenomenon of filling in the test road. The indoor CBR has high strength and good water stability and can satisfy the requirements of the subgrade filling Indicator requirements.