Structural surface has an important influence on rock creep characteristics.Using self-made creep experimental device,uniaxial creep experiment was carried out for mudstone specimens with flat closed structural surface.Experimental results show that when axial stress is 8~12 MPa,the ratio of creep strain to total strain of mudstone with structural surface increases linearly.With the increase of axial stress,the ratio of creep strain to total strain varies nonlinearly,exhibiting concave first convex later pa...