Study on improvement of mechanical properties of silt in river channel by loess content
[Objective]In order to explore the law of influence of loess content on physical and mechanical characteristics of river silt and achieve the purpose of improving sandy soil,[Methods]combined with the practical problems faced by road engineering in Taigu District,Jinzhong City,Shanxi Province,a series of laboratory tests were carried out to explore the effects of different lo-ess content and water content on the physical characteristics of river silt,shear strength,permeability and so on.[Results]The results showed that the silt permeability coefficient decreased with the increase of loess content,and the range gradually tended to be gentle,and the critical hydraulic slope gradually increased.The shear strength increases with the increase of loess content and decreases with the increase of water content.A critical value occurs when the loess content is 15%and the water content is 9%.[Conclusion]The results show that the loess content can affect the maximum dry density,pore ratio and relative compactness of silt,which significantly improves the soil compaction index and is conducive to the improvement of soil compaction and bearing capacity.Considering the cost of the project and the actual situation of the local area,it is suggested to set the loess content at 15%,which can achieve the purpose of improving the sandy soil.
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