The Study Of The Damage And Infrasonic Characteristics In Uniaxial Compressive Of The Cemented Tailings Backfill

This paper researches and analyzes the failure mechanism,the characteristics of damage and infrasound signals of the cemented tailings backfill in uniaxial compression from theory aspect.This paper analyzes the failure characteristics by uniaxial compression test,analyzes damage mechanics of cemented tailings backfill by the application of damage mechanics theory on this basis of the test.Through the analysis of the infrasonic characteristics of the cemented tailings,monitors the damage of the backfill according to detect abnormal changes of infrasound signals when tailings backfill damages.The study achieves great significance for an effective real-time monitoring system of underground backfill damage.The main contents include the following aspects:(1)Through uniaxial compressive strength test of the cemented tailing backfill,analyzes failure characteristics,researches failure characteristics and failure mechanism in uniaxial compressive process.(2)Through uniaxial compressive strength test of the cemented tailing backfill,analyzes damage mechanics in uniaxial compressive process,researches damage constitutive equations,damage characteristics and energy variation under damage characteristics.(3)In accordance with infrasound signals data which are collected by tailing backfill infrasound test in uniaxial compressive process of the cemented tailing backfill,analyzes the ARDC,the energy rate and time-frequency of infrasound signals,researches the infrasonic characteristics in uniaxial compressive process of the cemented tailings backfill.The study indicates that the infrasound frequency range of this filling body under uniaxial loading damage is irrelevant to the concentration of the filling,is 1~4Hz.(4)Through comparative Results of damage analysis and infrasound parameters in uniaxial compressive process of the cemented tailings backfill,analyze the relationship between damage parameters and infrasound parameters.The analysis indicates that the infrasound peak energy rate is proportional to peak damage value.(5)According to the infrasound signal characteristics which were collected from infrasound test experiment,infrasound can predict instability destruction of the cemented tailings backfill,have a great significance to the instability warning and monitoring of mine filling.