Relationship Between Soil Scaling Parameters And Physical And Mechanical Indexes

Grain size distribution?GSD?is a crucial factor affecting hydraulic conductivity and mechanical strength of soil.Current researches on soil properties are focused on special grains(d₁₀,d₃₀,d₅₀)and its deformation?Cu,Cc?,and the average particle size,sorting coefficient,skewness and kurtosis of parameters in Statistics,but these parameters are highly empirical.In this paper,based on the scale distribution of soil,the scaling parameters of grain size distribution for soil are used to describe characteristics of soil particles.And hydraulic conductivity,cohesive force and angle of internal friction,the permeability tests and direct shear tests for different grain size distribution are conducted.The conclusions are as follows:1.Particle size distribution of wide-graded soils is characterized by single or multi-peak distribution,and it has randomness and non-uniformity.The scale distribution P?D?=CD^-?exp?-D/D_c?is used to characterize the distribution characteristics of soil particles.The scaling distribution parameter?is used to the characteristics and behavior of fine particles in soil,and the scaling distribution parameter Dc is used to characterize the effect of coarse particles in soil.2.Whether"soil"particles or wide-graded soils,there is a logarithmic relationship between the parameter?and the hydraulic conductivity K,and K decreases with increment of?.There is fuzzy relationship between scaling distribution parameter Dc and K,and it has randomness.The relationship between?-K is as follows:K=mln^?+n,m and?affect the attenuation rate of permeability coefficient together,?represents the effect of particle size distribution on hydraulic conductivity,and m may be related to soil compactness.3.Under different water content,the relationship between parameter?and cohesion force is positive power function,and c increases with the increase of?.There is a negative power function relationship between Dc and?,and?decreases with the increase of Dc.The poor fitting relationship between Dc-c and?-?,which indicates there is no interaction between them.4.Cohesion force decreases more rapidly with increasing water content than angle of internal friction under different water content of the same soil.And the power exponent of the relationship between particle size distribution and mechanical strength is different,which indicates that the power exponent reflects the attenuation trend of the influence of water content on mechanical strength,and the power exponent decreases with the increase of water content.