全风化软岩填料级配对压实与破碎特性的影响

Effect of packing stages on compaction and crushing characteristics of fully weathered argillaceous sandstone

为研究颗粒级配对全风化软岩填料的压实特性及破碎特性的影响,对不同级配的全风化软岩进行击实、筛分及承载比试验。结果表明:全风化软岩最大干密度为1.86~2.05 g/cm^(3),最佳含水率为9.50%~11.23%。最大干密度随粗颗粒质量分数的增大而增大,随有效粒径和限制粒径的增大而增大,随不均匀系数的增大而增大,随曲率系数的增大先减小后增大;最佳含水率随粗颗粒质量分数的增大而减小,随有效粒径和限制粒径的增大而减小,随不均匀系数的增大而减小,随曲率系数的增大先增大后减小;4种级配的全风化软岩填料击实后的平均破碎率为0~30%,击实后级配曲线均向上限偏移,含水率对填料破碎率的影响较小,且粗颗粒质量分数越小破碎率越小;不同级配的加州承载比(california bearing ratio,CBR)为2.90~12.36,填料在压实过程中存在一定破碎,但含石量较大的土体仍能满足路堤填料填筑要求。在路堤填筑过程中提高含石量能取得较好的压实效果,可提高路堤承载比。

In order to study the effect of particle size on the compaction and crushing characteristics of fully weathered soft rock filler,compaction,screening and load-bearing ratio tests are carried out on fully weathered soft rock of different grades.The results show that the maximum dry density of fully weathered soft rock is 1.86-2.05 g/cm^(3),and the optimal water content is 9.5%-11.23%.The maximum dry density increases with the increase of mass fraction of coarse particles,and increases with the increase of effective particle size limited particle size,and increases with the increase of non-uniformity coefficient,and first decreases and then increases with the increase of curvature coefficient.The optimal moisture content decreases with the increase of the mass fraction of coarse particles,decreases with the increase of the effective particle size and the limited particle size,decreases with the increase of the non-uniformity coefficient,and increases first and then decreases with the increase of the curvature coefficient.The average crushing rate of the four kinds of graded soft rock filler is 0-30%after compaction,and the grading curves shift to the upper limit after compaction.The effect of water content on the crushing rate of the filler is small,and the smaller the mass fraction of coarse particles,the smaller the crushing rate.The California bearing ratio(CBR)of different grades is 2.90-12.36.There is some crushing of the filling in the process of compaction,but the soil with large stone content can still meets the requirements of embankment filling.Improving the stone content in the process of embankment filling can achieve better compaction effect and improve the embankment bearing ratio.