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

Zhang He, Sun Qiang, Zhenlong Ge

Acta Geophysica

2020

Vol. 68, no. 2

289--302

It is difcult to observe changes in the internal structure of natural rocks when under certain pressure ranges. However, such rocks have specifc 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 feld intensity can be established. Based on the stress–strain and magnetic feld 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 diferent 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.