超粒径土石混合料最大干密度的试验研究

采用自行研制的大型击实仪对超粒径土石混合料进行击实试验,同时对土石混合料超粒径部分采用剔除法、相似级配法及等量替换法处理后进行中型击实试验,根据试验结果,提出采用等量替换法可间接求出超粒径土石混合料最大干密度的结论。其次,对于连续级配的土石混合料,采用剔除法处理其超粒径部分,得出不同最大粒径下的松装密度、干燥密度、最大干密度和最佳含水量,从而提出剔除法处理超粒径土石混合料的最大干密度确定方法。最后综合比较等量替换法和剔除法的优缺点及适用条件,提出超粒径土石混合料最大干密度的确定方法。

A Study on Maximum Dry Density Test of Oversized Earth-Rock Mixture

The oversized earth-rock mixtures are compacted by use of the large-scale compaction device manufactured independently,and the middle-compacting tests are conducted when the parts out of the normal range are handled by use of the elimination method,the method of equal-weight replacement,and the method of similar grading.According to the results of the tests,the maximum dry density of the oversized earth-rock mixtures can be put forward indirectly by use of the method of equal-weight replacement.When the grading is consecutive,the parts out of the normal range are handled by use of the elimination method,the loose density,dry density, the maximum dry density and the optimum water content are obtained,the maximum dry density can be determined in terms of test results of elimination method.Last,evaluating the merits and drawbacks,conditions of application of the elimination method and the method of equal-weight replacement,the determined method for the maximum dry density of oversized earth-rock mixtures is presented.