Abstract：The canister retrieval test(CRT) was a test of a full-scale copy of a repository carried out from October 2000 to November 2005 at Äspö underground laboratory. Due to the excavation of the deposition hole DD0092G01 and the heating in the canister within the hole，there was a concern for the CRT rock volume if the changed stress around the deposition hole could lead to microfracturing in or other damage to the surrounding rocks. For this purpose，uniaxial compression testing has been performed on 12 core samples taken from different parts of sub-horizontal core boreholes drilled at three depths in DD0092G01 in the directions parallel and perpendicular to that of the major principal stress. The uniaxial compression strength(UCS) and Young¢s modulus，the crack initiation stress(sci)，crack damage stress(scd )，and the maximum crack volumetric strain(evcmax) and maximum total volumetric strain(evmax) have been compiled and analyzed. Comparisons were made according to the sampled direction to the major principal stress and the distance to deposition hole wall. It has been inferred from the slightly higher values of maximum crack volumetric strain that some damages，but only to a small extent and in the form of micro-fracturing，occurred in the rock near the deposition hole wall in the direction perpendicular to the major principal stress. There is no evidence of any damage from other mechanical properties.
