Shear-induced Permeability Evolution of Sandstone Fractures

Figure 1

Sample preparation: (a) sandstone block; (b) coring; (c) cylinders with the diameter of 25 mm and the height of 50 mm; (d) halved semicylindrical samples; (e) #120 Grit, #80 Grit, and #36 Grit (a lower value implies a coarser silicon carbide powder, thus implying a rougher surface); (f) grinding the planar surfaces by silicon carbide powder; (g) ground surfaces; (h) combining the specimen by Teflon tape.