Analysis of the characteristics of magnetic properties change in the rock failure process

It is difficult to observe changes in the internal structure of natural rocks when under certain pressure ranges. However, such rocks have specific magnetic properties that are established during their formation process. Through studying changes in their magnetic properties while under pressure, which are readily observed and analyzed, as combined and contrasted with their associated structural changes, the relationship between the stress-strain and the magnetic field intensity can be established. Based on the stress-strain and magnetic field strength data obtained from the relevant literature, the process of rock and rock-like mechanical failure can be divided into three stages: elastic, plastic, and rupture. The performances of different rocks during these stages were analyzed, and there was an obvious transition point between any two adjacent stages. Thus, this study provides theoretical support to establish the relationship between structure and magnetic variations of rocks and rock-like bodies.