A Novel Disturbance Stress Direction Identification Method of Rock Mass Using Acoustic Parameters.

The identification of the disturbance stress direction of rock mass is crucial for safe and efficient production in underground engineering. This paper proposes a novel disturbance stress direction identification method of rock mass using acoustic parameters, which can provide precise disaster protection in underground engineering. First, monitoring sensors are arranged in the target rock mass area for environmental preparation and data acquisition. Second, the acquired data are cleaned and the parameter weight is carefully balanced. Third, the objective function is constructed and the disturbance stress direction is identified. To verify the validity of the proposed method, the uniaxial and biaxial compression tests on granite specimens were carried out to simulate the engineering disturbances on the rock mass under equal and non-equal confining pressure conditions, respectively. The results showed that the average direction error of the novel method is 12.74°. The accuracy of the proposed method could be enhanced by dealing with rock mass in isobaric conditions and a larger dataset. This study not only achieves effective identification of disturbance stress direction but also contributes to preventing and controlling engineering disasters. Highlights: A novel disturbance stress direction identification method (DSDI) using acoustic parameters is proposed. The structural change of rock masse induced by disturbance stress is the inherent cause of anisotropy in acoustic parameter variations. The accuracy of DSDI was verified by the indoor experiment under equal confining pressure and non-equal confining pressure. [ABSTRACT FROM AUTHOR]