Effects of height/diameter ratio on failure and damage properties of granite under coupled bending and splitting deformation

In underground mining, rock roofs with different thicknesses have distinct failure patterns under the complex stress. To understand the height/diameter ratio (H/D) on failure properties and damage characteristics under the coupled bending and splitting deformation, a series of point-bending tests were conducted on granite disc samples with the same diameter but different heights. The micro-crack evolution during the test was measured and...