Study On Mechanical Properties Of Fine-grained Coarse-grained Soil Mixed With Loess

With the continuous advancement of science and technology in China and the continuous development of the construction industry,the application of coarse-grained soil in practical engineering has gradually matured,such as building earth-rock dams,railway subgrades,bridge piers and high-rise buildings.The coarse-grained soil has the characteristics of good compaction performance,strong water permeability,high density of filling,high shear strength,small subsidence deformation and high bearing capacity,and the application range of coarse-grained soil in engineering construction is expanding for coarse grains.It is very necessary to conduct experimental research on the mechanical properties of soil.In this paper,the fine-grained coarse-grained soil mixed with the loess loess in Xi'an City,Shaanxi Province is taken as the research object.According to the ratio of earth to stone mass ratio of 3:2,the loess is blended into the artificial coarse aggregate,the Xinjiang coarse aggregate and the Huxian coarse aggregate,and is prepared into fine-grained coarse-grained soil with different particle sizes.,Penetration test,compression test,direct shear test,conventional triaxial test,analyzed different test results,studied its physical and mechanical properties,and discussed the influence of three different fine grain coarse aggregates and grain groups on the parameters of Shenzhujiang model.law.The specific research contents are as fo lows:Firstly,the obtained loess was subjected to a sub-test,and in the case where the gradation of the loess was determined to be good,it was mixed with the coarse aggregate to prepare the desired coarse-grained soil.The grnt analysis of the coarse aggregates under various particle sizes was carried out,and the flatness and roundness of the three coarse aggregates(artificial coarse aggregate,Xinjiang coarse aggregate,and Huxian coarse aggregate)were obtained.Secondly,compaction test,permeation test and compression test were carried out on coarse-grained soil mixed with loess and admixture to study the influence of coarse aggregate content,gravel state and particle size on its maximum dry density,permeability and compression characteristics.Direct shear test and conventional triaxial test were carried out to study the effects of gravel,particle size and coarse aggregate content on shear strength,shear coarse-grained soil mixed with loess and additives were analyzed.The mechanism of influence summarizes the law of change.Finally,through the data of conventional triaxial test data,the parameters of the Shenzhujiang model of coarse-grained soil were determined,and the variation of the parameters of the coarse-grained soil-Pearl River model in three regions was compared.The coarse-grained gravel and the particle size were analyzed.The influence characteristics of the parameters of the Tushen Pearl River model.