Fine detection device and method for crack initiation and propagation of rock specimen during loading process

A fine detection device for crack initiation and propagation of a rock specimen during loading process, comprising an organic glass skeleton, a plurality of sensor support skeletons, an electrical parameter acquisition system, a sound emission signal acquisition system, a distributed optical fiber sound wave acquisition system, a servo press bearing platform and a computer, wherein the organic glass skeleton is placed in the middle of the servo press bearing platform, the sensor support skeletons are arranged inside the organic glass skeleton, the rock specimen is arranged inside the sensor support skeleton, the electrical parameter acquisition system and the sound emission signal acquisition system are fixedly arranged on the sensor support skeleton, the distributed optical fiber sound wave acquisition system is fixedly arranged on the inner wall of the organic glass skeleton, the electrical parameter acquisition system, the sound emission signal acquisition system and the distributed optical fiber sound wave acquisition system are in contact with the rock specimen, and the electrical parameter acquisition system, the sound emission signal acquisition system and the distributed optical fiber sound wave acquisition system are electrically connected to the computer;

• the electrical parameter acquisition system is used for collecting the parameter variation characteristics of the rock specimen in the loading and fracturing process;
• the sound emission signal acquisition system is used for acquiring the spatial position generated by the internal fracture of the loaded rock specimen;
• and
• the distributed optical fiber sound wave acquisition system is used for determining the intensity of vibration and the three-dimensional spatial position.