doi:10.16186/j.cnki.1673-9787.2019080040

Received:2019/08/12

Revised:2019/10/09

Published:2021/01/15

Study on the precursory identification and the evolution law ofthe failure of filling body

LIANG Xuejian1,2, SUN Guanghua1,2, XU Xiaodong1,2

1.College of Mining Engineering,North China University of Science and Technology,Tangshan  063210 ，Hebei,China;2.Hebei Province Key Laboratory of Mining Development and Safety Technique,Tangshan  063210 ,Hebei,China

Abstract:In order to explore the time-frequency characteristics of acoustic emission signals and failure modes in the process of instability failure of filling body,uniaxial loading acoustic emission tests were carried out on filling body with different cement-sand ratios.With spectrum analysis technology,the experimental results were analyzed in depth by means of time-frequency domain analysis.The research results showed that ： In the process of instability of filling body with different lime-sand ratios,the low frequency band signals took the largest proportion ，the high frequency band signals took the second place,and the medium frequency ones took the least.Before the peak stress,the low -frequency signals decreased obviously,and the medium and high-frequency signals increased obviously,which could be used as the precursor information of instability and failure of filling body.The distribution characteristics of acoustic emission parameters RA and AF eigenvalues at different times revealed the evolution process of failure modes.Tensile failure is the main failure mode in compaction and elasticity stage of filling body with the lime-sand ratio of 1:6.Shear failure is the main failure stage in plastic deformation and post-peak failure stage.Tensile failure was the main failure stage in the whole process of filling body with the lime-sand ratio of 1 : 10 ,and shear was the auxiliary one.Tensile failure was the main failure stage in the whole process of filling body with a lime-sand ratio of 1:15.The test results were of great significance to the study of the failure mechanism of filling body and the prediction of the instability of stope filling body from the mesoscopic perspective.

Key words:filling body with different lime-sand ratio;acoustic emission time-frequency;precursor of instability;failure mode

 充填体失稳破坏前兆识别及破坏形式演化规律研究_梁学健.pdf