砒砂岩与沙复配成土后最大干密度的研究

Study of Maximum Dry Density of Composited Soil with Feldspathic Sandstone and Sand

针对沙漠地区缺乏筑路材料的问题,选用当地砒砂岩与沙复配成土作为路基填料,以复配土为研究对象,制备质量比分别为1∶5、1∶2、1∶1、2∶1、3∶1、4∶1、5∶1的7种样品,运用室内重型击实试验,测得最大干密度和最佳含水率,分析压实特性,确定用作路基填料的最佳质量比.试验结果表明：当砒砂岩与沙的质量比为2∶1,含水率在7%-9%时最大干密度接近最大值,压实特性最好,适合用作路基填料.

For the problem of desert regions lack of road-building materials,the composited soil with local feldspathic sandstone and sand are chosen as subgrade filling,which is the main study object.This paper researches the maximum dry density and optimum water content of composited soil under seven different proportions 1∶5,1∶2,1∶1,2∶1,3∶1,4∶1,5∶1,through the indoor heavy compaction test.Then we can analyse the compaction and determine the suitable proportion of composited soil for subgrade filling.The results show that the proportion of 2∶1and the moisture content of 7%-9%are suitable for subgrade filling,because of the close maximum dry density and the best compaction.