Study Of Electrochemical Characterization Of Physical Properties Of Granite Residual Soil And Angle Of Slope Stability

Granite residual soils are widely distributed in Hunan Province.It has special physical and mechanical properties affected by mineral composition,weathering degree,particle size composition and other factors.Continuous heavy rainfall,The slope of granite residual soil is prone to destabilization,and its instability has strong concealment and sudden large deformation.To evaluate and predict the stability of this kind of slope,Enriching Critical Judgment Conditions,In this paper,the stability characteristics of slope morphology are studied.AC impedance measurement based on granite residual soil,Electrochemical characterization of physical and mechanical properties of granite residual soil.on this basis,Test of repose angle of granite residual soil,Exploring the relationship between angle of repose and water content.Model test of slope instability under indoor rainfall,Observation of rainfall duration,slip instability angle and saturation stability angle of slope failure under rainfall.The research results provide scientific basis for stability evaluation and prediction of granite residual soil slope.The main conclusions are as follows:1?The correlation analysis between EIS characteristic values of granite residual soil and water content,density and shear strength was carried out,An equivalent circuit reflecting the change of its physical and mechanical properties is proposed.The increment of virtual impedance and real impedance and high frequency extremum both decrease and converge with the increase of water content and density.The response of shear strength and virtual impedance increment to the change of density and moisture content is basically the same.The characteristic capacitance decreases linearly with the increase of shear strength.The characteristic impedance increases with the increase of shear strength.The impedance coefficients of virtual and real parts of equivalent circuits decrease with the increase of moisture content and density.2?The relationship between grain size,water content and angle of repose of granite residual soil is discussed.The angle of repose increases sharply when the particle size is less than 0.5 mm.The critical particle size of granite residual soil affected by the angle of repose is 0.5mm.The more the content of particle size less than 0.5mm,the greater the angle of repose of soil.Granite Residual Soil Before Saturated Water Content,Increasing water content is beneficial to increasing angle of repose.The water content of granite residual soil increases from 0%to 20%,The angle of repose increases from 33 to 44 degrees.When the water content is close to the saturated water content of soil,The angle of repose will decrease sharply.3?Through rainfall model test,the judgment value of slope morphological stability of granite residual soil is put forward.The initial moisture content of granite residual soil is 10%,The bulk density is 1.5g/cm~3,Rainfall Intensity 82 mm/h Rainstorm Continuous Rainfall 36 Minutes,The slope of granite residual soil larger than 43 degrees has the possibility of instability.When the water content of soil reaches 30%,Water intrusion and slip will occur on slopes,Saturated stability angle of slope after water influx and slip is 25 degrees.