千枚岩路基填料级配对路基性能研究

Study on Subgrade Performance of Phyllite Subgrade Filler Gradation

通过室内击实试验,改变千枚岩含石量,模拟现场千枚岩填料级配变化,采用水泥改良千枚岩,对其路用性能进行研究.结果表明:千枚岩随风化程度加强,其密度、强度,以及水稳性逐渐降低;随含石量增加,千枚岩最大干密度逐渐提高、最佳含水率逐渐降低,含石量70%的千枚岩二次击实最大干密度最大,级配良好;击实次数与含石量一定时,水泥改良千枚岩随水泥剂量增加CBR值逐渐提高;含石量不变时,水泥改良千枚岩7 d无侧限抗压强度随水泥剂量的增加呈现递增趋势.

In this paper,through indoor compaction test,the stone content of phyllite was changed,and the gradation change of phyllite filler was simulated.Cement was used to improve phyllite,and its road performance was studied.The results show that the density,strength and water stability of phyllite gradually decrease with the increase of weathering degree.With the increase of stone content,the maximum dry density of phyllite gradually increases and the optimum water content gradually decreases.The phyllite with stone content of 70%has the highest dry density after secondary compaction and good gradation.When compaction times and stone content are constant,CBR value of cement-modified phyllite increases gradually with the increase of cement dosage.When the stone content is constant,the 7-day unconfined compressive strength of cement-modified phyllite increases with the increase of cement dosage.