Experimental study on the acoustic emission characteristics and damage evolution laws of salt rock under different confining pressures and temperatures

The sample is selected from salt rock extracted from a salt mine in Pakistan, and the rock sample is light orange in color. The equipment used in the experiment includes the GCTS high-temperature and high-pressure dynamic rock triaxial loading system and the matching AE-8 acoustic emission monitoring system, as shown in Figure 3. The maximum output value of the axial pressure of the loading system is 4000 KN, the maximum applied value of the confining pressure is 140 MPa, the axial pressure resolution is 0.01 MPa, the axial deformation measurement range is 0-5 mm, and the circumferential deformation measurement range is 0-5 mm. The monitoring system is configured with 8 channels as the core, using a 16 bit high-resolution analog-to-digital converter with a signal acquisition bandwidth of 400 kHz. The core consists of components such as an acoustic emission processing card and a preamplifier, and is equipped with dedicated data acquisition software to achieve real-time acquisition and data recording of acoustic emission signals during the test process.