Contact friction included in the problem on rock failure under compression

Vasil'ev, L.M.; Vasil’ev, D. L.

doi:10.1134/s1062739115030060

Cited by 1 publication

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“…Energy transformation is the essential characteristic of various physical changes and the cause of the damage and destruction of rocks. The energy transformation of a rock load-carrying process is dynamic and includes an input, accumulation, dissipation, and release of energy, as well as the evolution of microcracks to macrocracks inside the rock [1][2][3][4][5][6][7][8][9][10]. Studying the deformation and failure laws of coalrock combined bodies from the perspective of energy is closer to its failure essence, enriching and deepening people's understanding of the mechanical behavior of loaded coal-rock combined bodies.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Transmission and Deformation Characteristics of Coal-Rock Combined Bodies

Wang

Chang

2022

Geofluids

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A coal-rock system is a common combination form in coal mines. In order to explore the energy interchange law of a coal-rock combined body and the interaction relationship between the two bodies, loading tests of coal-rock combined bodies with different height ratios were carried out. The loading path of rock in coal-rock combined bodies was demonstrated by means of a single loading and unloading test of the same-sized rock sample. Furthermore, a method to calculate rock energy was proposed based on the area of the loading and unloading curve. The experimental results show that the greater the surrounding rock pressure is, the smaller increase rate of lateral and volumetric strain in the postpeak stage will be when the same height ratio is present. An increase in the surrounding rock pressure causes an increase in the total strain energy density of small-sized rock samples. However, the total strain energy density is always greater than the elastic strain energy density. And the elastic and dissipated strain energy densities also increase, along with the energy dissipation with unloading. When the proportion of coal bodies increases, the energy accumulation also shows an increasing trend. When the height of the coal is greater than half the height of the complete specimen, the coal energy proportion is greater than 60%. After reaching the yield load, the energy in the coal body is dissipated in forms such as plastic deformation, internal damage, block friction, radiation energy, and kinetic energy. Therefore, the energy released is, in part, reflected in the rock body.

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