Stress Dependence of Elastic P-Wave Velocity and Amplitude in Coal Specimens under Varied Loading Conditions
V. L. SHKURATNIK1, P. V. NIKOLENKO1, A. E. KOSHELEV2
1Institute of Integrated Mineral Development-IPKON, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
2Gazprom Geotechnology, ul. Stroitelei 8, Bld. 1, Moscow, 119311 Russia
Keywords: каменный уголь, упругие волны, образец, лабораторный эксперимент, ультразвук, одно- и двухосное нагружение, Кузнецкий угольный бассейн, black coal, elastic waves, specimen, laboratory test, ultrasound, one- and bi-axial loading, Kuznetsk Coal Basin
Abstract
Experiments allowed finding regular patterns in propagation of supersonic elastic P-waves in specimens of black coal exposed to uniaxial compression and tiaxial compression by von Karman. It is shown that in case of uniaxial compression, the largest information content is ensured by translucence in perpendicular to bedding and loading axis of coal specimens. Such translucence exhibits four stages of deformation of a specimen. The information content of translucence under triaxial compression reduces with the increase in the lateral pressure that prevents from disintegration of a coal specimen. Four deformation stages are best identified with the lateral pressure of 2.5 MPa, while only stages of specimen consolidation and failure are traced at the pressure of 10 MPa.
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