Tunnel primary lining-secondary lining concrete interface direct shear sample as well as preparation method and application thereof

The invention discloses a tunnel primary lining-secondary lining concrete interface direct shear sample as well as a preparation method and application thereof, and belongs to the technical field of tunnel engineering. According to the method, the surface roughness morphology of primary lining sprayed concrete on site is collected through a three-dimensional scanner, a model partition plate with the surface roughness of the sprayed concrete is manufactured through 3D printing, the partition plate is fixed in the middle of a concrete mold through water-based glue, primary lining concrete is poured on the two sides of the partition plate and cured to be hard, and the primary lining sprayed concrete is obtained. A waterproof layer material is pasted on a primary lining concrete sample consistent with the primary lining sprayed concrete in surface appearance, secondary lining concrete is poured on the other side of a waterproof layer, and a primary lining-secondary lining concrete interface direct shear sample is