Experimental Study On Compressive Deformation And Strength Characteristics Of New Geo-filler

In order to find a reasonable,economic,fast and effective treatment method of soft ground and to solve recycled using of industrial solid wastes,a kind of new geo-filler was formed which was made of rubber particles and waste steel slag.The new geo-filler has many advantages of convenient construction,short construction period,massive accumulation of wastes on the land,environmental protecting,and it can form some geo-fillers with low density,light-weight and high compressive strength.In order to understand engineering characteristics of the new geo-filler,some compressive deformation characteristics and strength characteristics of the new geo-filler were studied by unidirectional consolidation compression tests,direct shear tests and tri-axial tests.The specific research contents included the following four aspects:Firstly,the physical and mechanical properties of pure steel slag were studied.The compressive deformation characteristics and shear strength characteristics of steel slag were studied by unidirectional compression tests and direct shear tests.Some change rules were analyzed on densities,compression modulus,cohesions and internal friction angles of steel slag under different water contents,and which were compared with the physical and mechanical properties of traditional soils.The highest water content was obtained and would be prepared for determining mass ratios of the new geo-filler.Secondly,the compressive deformation characteristics of the new geo-filler were studied.Considering the influences of rubber particle incorporation ratios,rubber particle sizes and clay incorporation ratios,the compressive deformation characteristics of new geo-filler were studied by unidirectional consolidation compression tests.And the compression modulus indexes of the new geo-filler were obtained and compared with compression characteristics of traditional soils.The advantages and disadvantages of the new geo-filler were analyzed in the engineering applications and would provide the basis for its application in practical engineering.Then,the shear strength characteristics of the new geo-filler were studied.Based on the proportion schemes of previous studies on deformation compression characteristics,the shear strength characteristics of the new geo-filler were studied by tri-axial tests Considering the influences of rubber particle incorporation ratios,rubber particle sizes and clay incorporation ratios.The change rules of shear strength indexes of the new geo-filler were analyzed and compared with the shear strength characteristics of traditional soils.They would provide some references for the application of new geo-filler in geotechnical engineering.Finally,the constitutive model of the new geo-filler was studied.Based on the results of tri-axial tests on the shear strength characteristics of the new geo-filler,one of the nonlinear elastic models named Duncan-Chang model was applied to simulate the constitutive model of the new geo-filler.The parameters of Duncan-Chang model were briefly analyzed,and the advantages and disadvantages of the simulated model for the new geo-filler were evaluated,which would provide some theoretical basis for the application of new geo-filler in geotechnical engineering.