Creep Characteristics Of Acid-etched Granite Residual Soil And Time-varying Characteristics Of Saturated Water Content

Acid pollution from natural and human engineering activities can significantly affect the physical and mechanical properties of rock and soil bodies.Granite residual soil(GRS)is widely distributed in the southeastern region of my country.When the slope is subjected to acid erosion,its long-term stability is mainly affected by the timevarying physical and mechanical properties of the soil in the slide zone.In the current research on GRS,the theory and laws obtained from the study of the constitutive model,deformation characteristics,damage mechanical properties,and physical parameters for the influence of the hydrochemical environment on its physical and mechanical properties still cannot fully evaluate the acid corrosion in actual projects.Deformation characteristics and stability of slopes.In order to clarify and quantify the effect of acid corrosion on GRS physical and mechanical indicators,improve the accuracy of slope stability assessment.This paper synthesizes GRS with the main mineral proportions,and tests the creep characteristics and saturation moisture content of acid-etched GRS.The following research conclusions are obtained:1.This article reveals the differences in the creep,long-term strength,and parameters of the creep characteristics of acid-etched and non-acid-etched GRS.The size of this difference depends on the acidity and duration of acidification,and shows certain critical characteristics.The specific performance is that the long-term strength of GRS is closely related to the acidity limit value(p H = 4).In the short term,the strain after no or weak acid(p H = 7?5)is stronger than that of medium-strong acid(p H = 4?3).Adding will increase the strength of GRS.When the acidification time t?15d,the strain under the action of moderately strong acid is generally stronger than that of no acid or weak acid,that is,the acid will reduce the strength of GRS after the acidification time reaches several weeks.2.The characteristics of the saturated water content of acid etched GRS were explored by the way of sample destruction,and it was found that the saturated water content is non-constant,and the correlation function with acidity and acidification time is: = (6 7)9)()+ (7,and revealed the relationship between the saturated water content and creep characteristics during the creep of acid-etched GRS.The change law of saturated water content,specifically manifested in p H = 4 is the characteristic value of acidity that affects the characteristics of the change of saturated water content.When p H> 4,the saturated water content has a peak at t = 15d;The saturation water content of the post-GRS decreases linearly with the increase of vertical pressure,and ? = 300 k Pa is the turning point of the nonlinear relationship.3.The application and analysis of the acid-etched GRS model test were carried out to obtain the difference between the stability of the acid-etched GRS slope and the nonacid corrosion.The stability analysis of the acid-etched GRS slope and the saturated moisture content was carried out.The GRS slope after acid etching The instability startslip time is prolonged,and the rainfall landslide process is more than 20% lower than the total strain of the non-etched slope.After the shallow layer is unstable,the slope will enter the constant velocity creep stage again,and under the action of subsequent rainfall Sudden landslides are more likely to occur,and the risk of slope instability is relatively higher.