Study on shear characteristics of mudstone soil-rock mixture under acid-alkali environment
[Objective]The distribution of mudstone soil-rock mixtures in the central and western strata of China is common,and its shear strength characteristics determine the safety and stability of mudstone foundation engineering and slope.The shear strength characteristics of mudstone soil-rock mixture are easily affected by the external acid-base environment.In order to explore the influence of acid-base concentration on the shear strength characteristics of mudstone soil-rock mixture,[Methods]in this paper,the samples were soaked in different concentrations of HCl and NaOH solutions,and the indoor triaxial shear tests were carried out under confining pressures of 100,200,300 kPa,respectively.The internal structure characteristics were ob-served and analyzed by scanning electron microscopy.[Results]The result show that the triaxial stress-strain curve of mudstone soil-rock mixture is obviously different from that of pure mudstone and soil.With the increase of acid-base concentration,the peak shear strength and residual strength of mudstone soil-rock mixture decrease,the cohesion decreases linearly,and the internal friction angle does not change significantly.The decrease of peak shear strength,residual strength and cohesion of sam-ples in acidic environment is greater than that in alkaline environment.[Conclusion]The result show that the mudstone blocks constitute a new skeleton system;the shear strength degradation effect of mudstone soil-rock mixture in acidic environment is more significant than that in alkaline environment,which can provide reference for the stability analysis and disaster prevention engineering of mudstone soil-rock mixture foundation and slope.
mudstonesoil-rock mixtureacid and alkali concentrationshear strengthmechanical propertiesdeformationinfluence factor
万方数据
维普
