Study On The Change Of Characteristics Of Laterite Under Acid Erosion And Its Influence On The Stability Of Earth-rock Dam Slope

Industrial pollution and chemical fertilizers,pesticides and others' long-term invasion,resulting in the mineral composition of red soil has changed,with the gradual increase in pollution,its influence on physical properties of red clay has been highlighted.Combined with domestic and foreign research on the status of contaminated soil,this paper focused on the change of water environment in the red soil covering area of Yunnan,the effects of acid pollution on the mineral composition of laterite were studied.This paper analyzed the degradation process of the affected red soil,discussed the relationship between the pollution degree and the red soil engineering index,and then studied the influence of mineral composition and water environment on the shear strength of the laterite.The threat of the acid reservoir water environment to the safe operation of the red soil dam was studied in order to establish the relevant quantitative relationship.In the course of the study,the author used the conventional geotechnical test to obtain the relevant engineering indexes of the laterite,and applied the ion detection to obtain the change data of the chemical composition in the soil,and established the relationship between the chemical composition and the slope safety through the correlation between the two formula.As the erosion rate of pollutants on the red soil is very slow,in order to reach a sufficient chemical reaction in the study period,based on the accelerated life test principle,the author used the method of concentration for time to analyze the evolution trend of the affected red soil.Using the numerical simulation combined with the multiple linear regression theory,the author discussed the relationship between the ion effluent and the slope stability of the active constituents in the eroded red soil,and applied the results to the engineering examples of the safety identification of the red soil dam slope.Research indicated that Montmorillonite due to the special lattice structure,with water swelling characteristics,its content on the soil shear strength has an important impact;The effect of water mineralization on the strength of cohesive soil is mainly achieved by the composition of minerals and the ions in the water;If the salinity of the water is high,the content of the montmorillonite in the soil is larger,then the effect on the shear strength of the clay is larger.The author also found that Clay minerals in the active ingredient chemical reaction,so that the cementation of the destruction of the material,which is the main reason for the reduction of red soil strength;As the sesquioxane reacts with the acidic substance,the amount of iron and aluminum ions precipitates as the acid concentration increases;Silica and titanium oxide does not react with acid,so the precipitation of silicon and titanium ions is very small.The seepage safety and stability of the wading slope are closely related to the content of active constituents in the soil.The quantitative relationship between the ion loss and the seepage and slope stability of the four main components in the red soil is established.The related traditional techniques focused on the physical mechanics analysis of the soil to determine whether the seepage state and stability of the slope meet the specifications and fill or mechanically reinforce the missing parts.On the basis of studying the long-term erosion of red soil in acidic water environment,this paper puts forward the idea of "active ingredient" which is closely related to engineering index,and clarifies the important effect of the loss of active ingredients on seepage safety and slope stability.To further study or develop it as a complementary method of traditional technology,so as to add the effective components of red soil loss,so that the prevention and reduction of geological hazards to do more with less.