Effect of Different Particle Grading on Shearing Strength of Completely Weathered Granite Backfill Soil
Following slope excavation,completely weathered granite backfill soil is created.It has a loose structure,weak mechanical and physical qualities,and is susceptible to water erosion,which can cause significant slope erosion.Traditional treatment methods have a limited impact;thus,improving the physical and mechanical qualities of the soil as well as its anti-scour ability can be accomplished effectively through soil renovation.The completely weathered granite backfill soil was taken as its primary research object.Indoor particle analysis tests and direct shear testing were used to perform a series of shear strength tests of remolded mixed soil under various mass proportions of red clay and sand particle.The results show that the nonuniformity coefficient and curvature coefficient generally rise when the mass proportions of red clay to sand particle increases.Grading parameters have an impact on the internal friction angle and cohesion by altering the ratio of fine to coarse particles in the soil as well as the way those particles interact with one another.This has an impact on the shear strength of mixed soil.Of these,adding sand particle increases the internal friction angle of mixed soil,but its cohesion is lower than that of backfill soil when the mass proportion exceeds 18％.Red clay,on the other hand,boosts cohesion,which reduces the internal friction angle when the mass proportion exceeds 30％.Furthermore,the red clay can enhance the chemical and physical characteristics,fertility levels,and soil shear strength of backfill soil.Although red clay with a mass proportion of 6％offers the best results,it can be chosen from a range of 6％-30％based on the needs in practical application.The ideal choice for sand particle mass proportion,taking into account the precautionary measures of future work,is 18％.
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