Experimental Study On The Influence Of Clay Minerals On The Mechanical Properties Of Loess

The particle skeleton of natural loess forms a primary structure with certain arrangement and connection characteristics,and has a certain initial structural strength.The research on the structure of natural Huangshi under the initial stress level state is in line with the actual situation of the project site.In this paper,through unconfined compressive strength test and triaxial compression test of undisturbed loess,remolded loess and saturated undisturbed loess,on the basis of comprehensive structural potential,combined with structural index,stress structural parameter,stress Compared with structural parameters,the law of structural change of loess is studied.A generalized structure degree is proposed to describe the structural changes of loess under natural conditions.The relationship between mechanical properties and structural parameters of loess under natural stress is studied.(1)Based on the unconfined compressive strength test,the stress-strain curve of three different depths of loess is studied.The structure degree is used as a parameter to describe the initial structure of the loess,and the structure degree varies with water content and uniaxial resistance.Changes in compressive strength.(2)Through the triaxial compression test of loess at three different depths,the stress-strain relationship of loess under different confining pressure and water content is obtained,and the relationship between structural parameters of stress and stress ratio with confining pressure and water content is summarized.Change characteristics.(3)Use the compound power-exponential model to fit the measured loess stress-strain curve,and use the compound power-exponential model to predict the stress-strain curve of the undisturbed loess,remolded loess,and saturated undisturbed loess under natural conditions,and compare them with the measured ones.Comparison of stress-strain curves.(4)The generalized structural parameters describing the structural changes of loess under natural stress state are proposed,combined with the stress-strain curve of loess under natural state predicted by the composite power-exponential model,and the water content and confining pressure are analyzed with the structural characteristics of natural loess.The relationship of change,discusses the structural change characteristics of natural loess.