Acoustic Emission Characteristics and Damage Evolution Analysis of Sandstone under Three-Point Bending Test
نویسندگان
چکیده
In order to study the prevention of roadway roof bending, sinking, and breaking dynamic disasters such as appearance rock bursts, three-point bending experiments sandstone under different spans were carried out. By using stress loading system acoustic emission technology, characteristic parameters fracture process analyzed, precursory information was explored, evolution law damage based on characteristics obtained. The results showed that according variation ringing count, load-time curve divided into four typical stages: first stage an overall increasing trend; second obvious third accelerated growth count reached maximum at moment rupture. fourth stage, amplitude frequency are large high. With increase in span, cumulative counts AE decreased, rate change gradually decreased. can reflect precursor from time domain, R value (ratio energy count). II be used predict sandstone. peak shows a linear after spike then rupture, boundary point between nonlinear decrease indicate main crack is growing specimen. According rate, variables five stationary low, increasing, decreasing, coalescence, complete fracture. decreasing trend. residual fluctuates 0.38 0.40 due difference propagation trajectory. It has theoretical research for revealing internal mechanism engineering guiding significance mine pressure strata control disaster prevention.
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ژورنال
عنوان ژورنال: Advances in Materials Science and Engineering
سال: 2023
ISSN: ['1687-8434', '1687-8442']
DOI: https://doi.org/10.1155/2023/9030449