Common Precursor Characteristics of Uniaxial Compression Failure of Rocks with Different Lithology

doi:10.12068/j.issn.1005-3026.2023.09.012

Abstract

Abstract: The strata in coal mines are often distributed in layers with coexisting lithologies. The precursory indicators obtained from the study of the rock instability of a single lithology can often be challenging to apply in practical engineering. Therefore， it is important to explore the relationship between the fracture process of different lithologic rocks in a coal mine and acoustic emission(AE)parameters and establish various lithologic rock stability evaluation mechanisms based on AE parameters. In view of this， an acoustic emission monitoring system was used to measure three sequential types of lithology rocks(fine sandstone， sandy mudstone and siltstone)taken from coal seams. Through examining the correlation of AE parameters， five AE parameters with low correlation， such as energy， b-value， dominant frequency， apparent stress and apparent volume， are selected as the precursor indexes of the rock failure， and a stability evaluation system suitable for these three lithology rocks is established. The research results provide a basis for coal mine disaster early warning and prediction based on microseismic monitoring in practical engineering.

Key words: acoustic emission parameters; precursory characteristic; high energy event; stability evaluation; dynamic b-value

CLC Number:

TD76

ZHAO Yong， GU Xu-sheng， WANG Shu-hong， GAO Yang. Common Precursor Characteristics of Uniaxial Compression Failure of Rocks with Different Lithology[J]. Journal of Northeastern University(Natural Science), 2023, 44(9): 1309-1317.

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