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Journal of Mining Sciences

2015 year, number 4

Nonlinear Deformation-Wave Processes in Various Rank Coal Specimens Loaded to Failure in Varied Temperature Field

V. N. OPARIN1,2, T. A. KIRYAEVA1, O. M. USOL’TSEVA1, P. A. TSOI1, V. N. SEMENOV1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 4, Novosibirsk, 630091 Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Keywords: связи, температурное поле, деформационно-волновые процессы, стадии метаморфизма, образцы, угольные месторождения Кузбасса, напряженно-деформированное состояние, выход летучих, предельная внутренняя энергия, релаксация метаноносности, connections, temperature field, deformation-wave processes, ranks, specimens, Kuzbass coal deposits, stress-strains state, volatile yield, limit internal energy, methane relaxation

Abstract

Aiming to build up a phenomenological basis for the theory of interaction between geomechanical, thermal and physicochemical processes in methane-bearing coal in Kuzbass, the authors have performed a set of laboratory bench tests on uniaxial stiff loading of various rank coal specimen to failure at a rate of 3.3∙10-6 m/s. The pressure versus temperature dependences are obtained for coal specimens with granite interbeds using high-precision computerized thermal scanner. It is shown that temperature change in coal specimens subjected to loading to failure is connected with volatile yield and internal energy relaxation of methane in Kuzbass coal. Using jointly thermal imaging and laser measuring equipment ALMEC-tv for high-precision and detail control of deformation-wave processes in loaded coal specimens by speckle-method, it has for the first time been proved that nonlinear pendulum-type movements of structural elements are possible in coal specimens under varied temperature field, which is of fundamental importance for actualization of previously ignored mass and gas exchange processes in high-stress different-grade coal seams under mining.