30 joint-slices with 10 grades of roughness（JRC=1~20）and 3 kinds of thickness (1.5

3.0

5.0 mm) are produced by using 3D printing technology

and then poured into rock-like specimens containing consecutive and filling fracture by moulds. Then the seepage tests are carried out on these specimens with different roughness levels and gap-widths under different confining pressures. The test results show that the permeability of consecutive and filling fracture with different roughness levels and gap-widths decreases with the increase of confining pressure. Moreover

the decrease rate of permeability in the initial stage of confining pressure loading is obviously higher than that in the middle and late periods

and the maximum permeability drop is 78%. In the initial stage of confining pressure loading

when the gap-width is small

the roughness has a great influence on the seepage characteristic of consecutive and filling fracture. While

as the gap-width and confining pressure increase

the effect of the roughness on the fracture permeability rapidly decreases. For all consecutive and filling fracture with 10 grades of roughness

the permeability increases with the increase of the gap-width in the initial and late stages of confining pressure loading. When the confining pressure is small

the larger the roughness is

the greater difference the permeability of consecutive and filling fracture at different gap-widths has. However

with the increase of confining pressure

the difference is gradually reduced. The confining pressure have a dominant influence on the permeability of consecutive and filling fracture

and their relationship can be described by a power function.