Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure.

ABSTRACT: The ultrasonic characteristics of the coal and rock bodies around boreholes during failure are closely related to the crack propagation law. To investigate the ultrasonic characteristics and crack propagation law of coal and rock bodies around boreholes, different grouting samples with boreholes were taken to carry out ultrasonic test during progressive failure. The ultrasonic amplitude, velocity and attenuation coefficient of the samples were analyzed. According to the ultrasonic time difference formula, the equivalent crack width of the sample during the failure process is calculated. The influence of grouting material on the crack propagation law is quantitatively analyzed. The results show that: (1) The peak stress, elastic energy at the peak, ultrasonic parameters and crack propagatio

SUBMITTER: Ji X 

PROVIDER: S-EPMC10212090 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature