Loading rates dependency of strength anisotropy in coal: Based on the three‐dimensional reconstruction modeling technology

Song, Honghua; Zhao, Yixin; Wang, Jiehao; Jiang, Yaodong; Wang, Xinzhong

doi:10.1002/ese3.862

Energy Science & Engineering

2021

DOI: 10.1002/ese3.862

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Loading rates dependency of strength anisotropy in coal: Based on the three‐dimensional reconstruction modeling technology

Honghua Song

Yixin Zhao

Jiehao Wang

et al.

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Cited by 5 publications

References 56 publications

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Mechanical properties and energy evolution of outburst coal seams under different load regimes

Tianjun,

Jiaokun,

Gang

et al. 2024

Energy Science & Engineering

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Coal elasticity and gas expansion are important factors for coal and gas outburst. During the outburst process, the elastic strain energy of coal is mainly released from the stress region, and the gas expansion energy near the working face is larger, and it is not a continuous release process. To reveal the mechanical characteristics and energy evolution of outburst coal seam, uniaxial and triaxial compression tests were carried out on outburst coal seam samples under different loading methods. The experimental results show that the elastic characteristics become more obvious with the increase of loading rate, the peak strain increases, the elastic modulus is linearly related with the loading rate，and the overall degree of fragmentation increases with the increase of loading rate, which is consistent with the severity of macroscopic coal failure. The failure mode of coal under uniaxial compression conditions is often manifest as brittle failure. The strength characteristics of coal under different loading rates comply with the Mohr‐Coulomb criterion, and the peak strength is linearly related to the failure time and loading rate. With the increasing confining pressure causes the failure of coal samples to transition from ductile to brittle, and the failure mode develops from local shear to overall splitting. The elastic energy evolution curve is consistent with its stress‐strain curve. With the increase of confining pressure, the limiting elastic energy and peak total energy increase in a quasi‐linear manner. The accumulated limit elastic energy plays an important role in the failure of coal samples, and the macroscopic manifestation thereof is that the coal samples fail more severely under high confining pressure conditions than under low confining pressure conditions. The research results are of great significance for the comprehensive prevention and control of coal and gas outburst.

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Mechanical properties and energy evolution of outburst coal seams under different load regimes

Tianjun,

Jiaokun,

Gang

et al. 2024

Energy Science & Engineering

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Effect of Pore Pressure on Strain Rate-Dependency of Coal

Su¹,

Siddiqui²,

Roshan³

2023

Rock Mech Rock Eng

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Viscoelastic strain rate-dependent behaviour of coal is critical in several subsurface engineering applications especially coal seams gas production. Such rate dependency is controlled by the interaction between coal bulk and gas sorption (a sorbing gas) or gas pressure (a non-sorbing gas). Despite the research conducted to date, the gas pressure effect (non-sorbing) on the viscous behaviour of sediments in particular coal remains unexplored. We, therefore, investigate the strain rate-dependent mechanical behaviour of coal under isotropic loading to specifically explore the effect of gas pressure (Helium) on its rate dependency eliminating the sorption effect. We perform a set of triaxial experiments on coal specimens at dry and pressurised gas (Helium) conditions under different strain rates under isotropic loading. The experimental results show that all coal specimens have viscoelastic strain rate dependency at a dry condition where viscous effect increases with strain rate. As a result, the bulk modulus of the specimens increases with the increase in strain rates. This strain rate dependency response, however, reduces with an increase in pore pressure and vanishes at a certain pore pressure under the same effective stress to that of dry specimens. We further employ X-ray micro-Computed Tomography (XRCT) to 3D scan a coal specimen saturated with Krypton gas undergoing different loading rates to shed light on the micro-mechanisms of gas pressure effect on specimens’ rate dependency. The XRCT results show that gas can be trapped in small-scale fractures and pores during the loading process leading to a localised undrained response that can stiffen the specimen and reduce its ability to show viscous rate dependency. The obtained results are significant in optimizing coal seam gas production and coal seam gas drainage applications.

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Study on unified strength approach of asphalt mixture under different stress conditions

Yang

Qian

et al. 2022

Construction and Building Materials

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Loading rates dependency of strength anisotropy in coal: Based on the three‐dimensional reconstruction modeling technology

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 5 publications

References 56 publications

Mechanical properties and energy evolution of outburst coal seams under different load regimes

Mechanical properties and energy evolution of outburst coal seams under different load regimes

Effect of Pore Pressure on Strain Rate-Dependency of Coal

Study on unified strength approach of asphalt mixture under different stress conditions

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