Study On The Effect Of Fine Particle Content Of Sliding Mass And Slip Surface Roughness On Motion Characteristic Of Landslide

The shear strength of sliding material and the friction coefficient of sliding surface have a profound influence on the movement process and characteristics of landslide.In order to further in-depth study on the influence of motion characteristics of landslide by fine particle content of the sliding mass and the slip surface roughness,the direct shear test were used in this thesis to explore the interfacial mechanical behavior with different content of fine particle of mixed fraction specimens and different roughness surfaces,the landslide movements under different conditions were simulated through physical simulation experiment,and 3D scanner and other test equipments were used to extract data of landslide motion characteristics,to study the chang law with different conditions,the characteristics of interfacial mechanical behavior and landslide motion were related,the non-linear regression analysis method was carried on the quantitative research,finally some main research results were obtained as follows:(1)Through the analysis of the results of indoor direct shear test,it was found that with the increase of the normal stress or the roughness of the sliding surface,the interfacial mechanical behavior parameters were basically increased.5%,10% and 20% fine contents were mostly the turning points of change trends of parameters with the fine particle content of the sliding body.(2)The data of the landslide physical simulation test was analyzed,it was found that with the increase of the fine particle content of the sliding mass,the dispersion degree increased gradually,and the non-uniform dispersion of the front edge and main part of sliding mass was more obvious.When the fine paricle content was large,the main sliding body disintegrated with bulks and slid down in batches.(3)With the increase of fine particle content of landslide body,the length of the accumulation body increased first and then decreased,the trend of the width was basically the same as the area,and the average thickness was basically the opposite.With the increase of the surface roughness,the accumulation body length,peak thickness ande average thickness all increased,and the area decreased.(4)The interfacial mechanical behavior parameters and the characteristics of landslide motion could be quantitatively expressed by combining the fine particle content of sliding masses and the roughness of sliding surfaces.With the increase of residual strength and fine particle content,the apparent friction coefficient and the average thickness of deposit body increased first and then decreased,the accumulation body length,width,peak thickness,base area,horizontal and vertical velocity all decreased first and then increased.With the increase of residual strength and sliding surface roughness,the apparent friction coefficient,average thickness and horizontal velocity mostly increased first and then decreased,while the accumulation body length,width,peak thickness,area and vertical velocity mostly decreased first and then increased.