Experimental Study On The Effect Of Particle Size On Mechanical Properties Of Artificial Cemented Samples

Micromorphology is necessary to study structural from a microscopic perspective.Making artificially controllable samples is an important step in studying soil mechanics at a microscopic level.In this paper,steel balls of varying diameters(diameters 1mm,2mm and 3mm)were used as the framework grains of artificially controllable samples,and cementing materials were mixed with bentonite and wax in a ratio of 0 to 1,1 to 2,1 to 1,and 2 to 1,respectively.Triaxial tests were carried out under different confining pressures to study the physical parameters of prepared samples such as different pore filling ratio,void ratio and wax content.The stress-strain relationship,shear strength index and Duncan-Chang E-v model parameters of artificial cemented samples.influences.In addition,this paper explores the influence of particle size and other parameters on the macroscopic mechanical properties of soil,and classifies the influence of various physical parameters on the shear strength of artificial cemented samples to study the microscopic(granular)structure of soils.The impact of nature.Through the test results,the following rules and conclusions can be obtained:(1)Under the same pore ratio,pore filling rate and wax content,the artificial samples of three different particle sizes increased with confining pressure,the stress strain peak increased,Et and E50 increased,vi decreased,and confining pressure and The axial strain has a quadratic function relationship.(2)When confining pressure increases from 50 kPa to 200 kPa,the anisotropy of deformation modulus and shear strength of artificial specimens with different particle sizes decreases simultaneously,and the variation trend of anisotropy is generally the same,so the artificial cemented specimens belong to low anisotropy.(3)Under the same confining pressure,particle size,wax content and void ratio,the larger the pore filling rate is,the higher the strength of the sample is.The pore filling rate determines the content of the cementing material in the sample,which can directly affect the sample.Cohesion,which in turn affects the strength of the sample.(4)The particle size only has a combined effect with the cement materials with different wax content.The other conditions are the same.When the wax content is 33.3%,the internal friction angle of the sample decreases and the strength decreases with the increase of the particle size.When the wax content is 100%,the internal friction angle of the sample increases and the strength increases as the particle size increases.(5)Other conditions are the same,the wax content or particle size increases,the k value increases,and the n value decreases.There is no inevitable regularity between wax content and particle size and G,F and D.The true void ratio has a direct effect on Ei,but it does not show a certain law with k,n,G,F,and D.