Shear Mechanical Properties of Residual Soil-concrete Interface Considering the Effect of Roughness Coefficient
To investigate the direct shear behavior of residual soil-concrete interface under different roughness coefficients,oven-dried residual soil samples were prepared at different water contents(13％,19％,25％)to form remolded soil samples,which were then subjected to a series of monotonic direct shear tests using a pneumatic direct shear apparatus against 3D-printed concrete blocks with varying roughness coefficients under normal stresses of 30,60,90 kPa.The effects of different factors on the shear stress-shear displacement characteristics was examined at the residual soil-concrete interface,as well as the vertical displacement-shear displacement patterns and strength indicators.The experimental results indicate that the interface shear strength increases with the increase of contact surface roughness coefficient,initially rises and then decreases with increasing water content,reaching a peak around 19％water content.The interface friction angle shows little variation with increasing roughness coefficient,while it tends to increase initially and then decreases with increasing water content.The interface cohesion increases with the roughness coefficient initially and then stabilizes,while it increases initially and then decreases with increasing water content.The fitting results of the roughness coefficient,water content,and shear strength suggest that the peak values of interface shear strength are achieved at water content ranging from 15％～20％and contact surface roughness coefficients ranging from 16～18.
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