The CT scanning technology based on the X-Ray

which can scan a rock specimen through multilayer continuously and nondestructively

has been introduced into the study of the rock mechanics and engineering widely. It is one of the important content of rock mechanics research

to monitor the failure processing of rock sample under uniaxial compression loading by CT technology. During the 3D microscope CT real-time monitoring of rock condition under uniaxial compression loading

there will be some error caused by the imprecise positioning of the CT scanner device. Aiming at this imperfection

a new CT slice image processing method based on image retrieval (IR) technology

is proposed. Coal and rock sample under uniaxial compression loading

is monitored during its failure process

and with the similarity computing method based on the Manhattan distance measure introduced

the rock sample’s CT image and its similar-slices of different stress stages are retrieved. The results show that: The IR technology may effectively reduce the error due to the displacement during the coal and rock failure process; with the help of CT slice image

microcrack distribution and evolution rule of the coal and rock samples in different stress stages

can be preferably described; moreover

at mesoscopic level

the basic law of coal and rock failure process under the uniaxial compression loading

get further revealed.