Quantitative calculation model for internal water film tension action of indoor direct shear granular medium

The invention discloses an indoor direct shear granular medium internal water film tension effect quantitative calculation model, which comprises the following steps: S1, adopting a laser particle analyzer to pass through granular media with different mesh numbers to obtain a mesh number and volume density conversion table of the granular media, and calculating the apparent density under different particle sizes and different water contents; s2, shearing the granular media by adopting a direct shear apparatus to obtain the shear strength of the granular media with different particle sizes in different water content states; and S3, defining that a water film exists on the surface of the granular medium, and from the starting point of stable increase of the shear strength, depicting the influence of the water film tension on the shear strength through the shear strength increment of unit water film thickness. According to the quantitative calculation model for the tension action of the internal water film of th