Study on Failure Characteristics and Acoustic Emission Parameters of Coal Rock under Uniaxial Loading
In order to explore the mechanism of coal rock mass failure evolution under acoustic emis-sion monitoring,parameters such as amplitude,ringing count,and event number of acoustic emission dur-ing uniaxial compression were collected through experiments.The characteristics of coal rock mass failure and acoustic emission signals were used to reflect its evolution stage.The research results indicate that dur-ing the initial compaction stage and elastic stage,the acoustic emission signal parameters are relatively small,and the sample hardly produces new cracks;During the yielding stage,the signal parameters begin to increase and new cracks gradually appear in the sample;The peak intensity point acoustic emission signal parameters are active,and the energy storage of the sample reaches its maximum,indicating imminent de-struction;After the peak intensity,the sample begins to release a large amount of energy,and the acoustic emission signal parameters explode.A multimodal information collaborative monitoring device of"sound light electricity"is developed to obtain vibration signals,stress change trends,and internal crack develop-ment of surrounding rock caused by mining disturbance and comprehensively evaluate the state of surround-ing rock,which provides guarantees for on-site safety production.
万方数据
维普
