Meso-structural permeability of S-RM based on numerical tests

For the extreme difference in characteristics between and which compose soil-rock mixture(S-RM),the physical and mechanical characteristics of S-RM are more complex than those of the general soil or rock.And for the insufficient recognition of S-RM,different degree problems will be met in many engineering projects.Especially in the southwest of China,with the building of large scale hydropower stations,the S-RM is usually the main geomaterials for slopes,landslides and dam basements in the reservoir area.Permeability is one of the important study contents of the physical characteristics of geomaterials.There is a close relationship between the permeability of S-RM and its meso-structure,and it is of great value to study the S-RM if we can build this relationship.The statistics,geometry,random simulation technique and so on are employed,and a software(R-SRM2D) is developed for the generation of random meso-structure of S-RM based on arbitrary convex polygon blocks and elliptic blocks.Using R-SRM2D,many samples with different rock block proportions,spacial distributions,and rock block size distribution,etc.are generated,and based on the numerical tests,the characteristics of the meso-seepage field,the mechanism of seepage failure and the quantitative relationship between the maro-permeability coefficient of S-RM and its meso-structural characteristics are studied.