Division Of Energy Scale And Analysis Of Engineering Properties For Soil Granular Group

The engineering properties(like plasticity,strength,permeability,etc.)of soil come from the basic characteristics of particles and structure of soil,and are generally affected both by the grain size and composition.According to related specifications,clay particles are particles in soil whose diameters are less than 2?m,and Clay granulation is the main component that determines the plasticity and hydrological properties in soil.However,if dividing the grains according to their geometric size completely,it is difficult to evaluate the soil engineering properties according to the composition(proportion)of the particle fraction.Hence,on the basis of the energy scale criterion of particle fraction,this paper adopts the ration of interaction force between particles and gravity and defines the unified micro-weight ratio as the classification principle.In addition,the use of plastic index as grouping basis is also investigated.This research provides great convenience for the engineering application.The main research work and findings in this paper are as follows:(1)Due to the differences between surface energy and surface activity of particles,the engineering properties,like plastic properties,strength and permeability characteristics vary largely for several mineral particles with same particle radius and geometric scale clay particles(d = 1.9 ?m)(2)This paper defined the unified micro weight ratio of several mineral particles as Fe/W = 10,and this formula could be adopted as the standard of dividing particle set called energy scale particle set.The dividing boundaries calculated from this criterion for different mineral particles are: quartz d < 1.14 ?m,feldspar d < 1.27 ?m,montmorillonite d < 13.66 ?m,illite d < 4.54 ?m and kaolinite d < 2.23 ?m.(3)The experiments aiming at investigating the plastic properties for the energy scale clay particles were performed and results show that the plastic properties of different clay particles with same micro weight ratio are nearly identical.Based on experimental and analytical results,the partition standards about energy scale particles can reflect that the engineering properties under the influence of particle size and mineral properties,which is reasonable.(4)By adopting the method of “dividing particle set according to some index of plasticity” and setting the unified index of plasticity Ip = 30 as the dividing standard,experiments were performed and the dividing limit for different clay particles are: montmorillonite d < 26 ?m,illite d < 14 ?m,kaolinite d < 4 ?m.