Study on Particle Size Effect of the Compaction Characteristic of Soil-Rock Mixture
Particle size effect exists in the compaction characteristics of soil-rock mixture.In this paper,laboratory compaction tests are carried out under the conditions of fixed stone content,different maximum particle size and wa-ter content of loess and stone mixture,to obtain the optimal water content and maximum dry density of soil-rock mixture samples with different particle sizes.The impact of particle size on the compaction effect of soil-rock mixture are analyzed.The results show that the soil sample gradually changes from collapse to complete state and the dry den-sity increases gradually with the increase of water content.When the water content exceeds the optimal water con-tent,the water molecules play a lubricating role.The surrounding soil is extruded so that the overall volume is no longer decreases,showing a soft plastic flow state,and the sample has a large deformation from complete demould-ing to demoulding.With the addition of stone,the maximum dry density of the mixture is significantly increased.Under the condition that the stone content is 70％,the maximum dry density of the sample with the largest particle size of 20 mm,30 mm and 40 mm increase by 24.9％,28.1％and 29.7％,respectively.The larger the maximum par-ticle size,the more obvious the dry density improvement effect.The optimal water content decreases with the in-crease of the maximum particle size.When the maximum particle size is 20～40 mm,the corresponding optimal wa-ter content is 5.2％～5.9％.With the increase of the maximum particle size,the optimal water content changes by 0.2％and 0.5％,respectively.It shows that with the increase of the maximum grain size,the decrease rate of the op-timal water content increases in the range of 20～40 mm under the condition of 70％stone content.
soil-rock mixtureparticle size effectcompaction testthe maximum dry densitythe optimal water content
万方数据
维普
