Structural health monitoring of building rock based on stress drop and acoustic-electric energy release

The process of building rock failure is often accompanied by stress drop and energy release, which seriously threaten the safety of building structures. To reveal the law of energy release and transformation in the process of rock stress drop and establish a rock structural health monitoring index based on stress drop energy, the relationship between the stress drop and acoustic-electrical (acoustic emission and electromagnetic radiation) energy of the shale and limestone failure process is studied in this paper. The results show that, in the early stage of rock loading, there is almost no stress drop dissipated energy, and the change in acoustic-electric signals is not obvious. In contrast, in the later stage of deformation and failure of rock, the generation process of stress drop is accompanied by significant stress drop dissipated energy and acoustic-electric energy release. With the increase in stress drop dissipated energy, the released acoustic-electric energy gradually increases, and there is a good linear positive correlation. The release mechanism of the acoustic-electric energy in the process of stress drop is mainly related to the crack propagation effect. The more significant the stress drop is, the faster the crack unstable propagation, the more intense the charging and discharging processes are on the crack faces, and the more acoustic-electrical energy is released. Finally, a new indicator of rock structure health monitoring based on stress drop energy is established by a statistical method, and the health status of the rock mass structure is divided into weak, medium and strong danger, thus reflecting the stress distribution state and structural stability of rock.

Automated summary

This study investigates the relationship between stress drop and acoustic-electrical energy during rock failure processes, finding that with the increase in stress drop dissipated energy, the released acoustic-electric energy gradually increases with a good linear positive correlation. A new indicator for monitoring rock structure health based on stress drop energy is established, allowing for the assessment of rock structure's health status.