Experimental Study on Engineering Characteristics of Aeolian Sand in Taklimakan Desert
In response to the shortage of high-quality railway subgrade filling materials in Northwest desert areas,experiments such as scanning electron microscopy,compaction,and direct shear tests were conducted to study the technical performance of aeolian sand from both micro and macro perspectives.The results show that the structure of aeolian sand is loose,the surface edges of the particles are relatively smooth,and the main particle size is 0.075～0.250 mm.There are fewer silt and clay particles,and the particle size is uniform.The grading is poor,and it is classified as an intermittent graded C3 filler.The compaction curve of aeolian sand shows a unimodal shape,with maximum dry density and optimal moisture content of 1.61 g/cm3 and 12.5%,respectively.The maximum dry density and optimal moisture content of cement mixed aeolian sand increase with the increase of cement content.The theoretical cohesion of aeolian sand is 0,the theoretical internal friction angle is 27.4°,and the shear resistance is poor.Aeolian sand has poor physical and mechanical properties and cannot be directly used as a filling material for railway subgrade.Therefore,aeolian sand should be improved.
railway subgradedesert areaaeolian sandscanning electron microscopyx-ray diffractioncompactiondirect shear test
万方数据
维普
