Initiation and Propagation of Compaction Bands in Dry and Wet Bentheim Sandstone

We investigated initiation and propagation of compaction bands (CB) in six wet and four dry Bentheim sandstone samples deformed in axial compression tests with strain rates ranging from 3.2 9 10 -8 s -1 to 3.2 9 10 -4 s -1 . Circumferential notches with 0.8-mm width and 5-mm depth served to initiate CB at mid- sample length. Wet samples were saturated with distilled water and deformed at 195 MPa confining pressure and 10 MPa pore pressure. Dry...