Energy Evolution Characteristics of Coal–Rock Composite Bodies Based on Unidirectional Load

Du, Xuanhong; Xue, Jianyang; Ma, Qian; Chen, Zhiheng; Zhan, Keliang

doi:10.1007/s11053-022-10039-6

Cited by 15 publications

(7 citation statements)

References 46 publications

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“…Using Equation (12) and the convolution theorem from Equation ( 13), the analytical solution of the stress distribution in the bottom plate subjected to a non-uniform load semi-infinite body can be obtained, that is, the protective seam after mining, as follows.…”

Section: ( ) ( )mentioning

confidence: 99%

“…Protective seam mining can realize both the stress unloading of the coal body of the protected seam, which reduces the possibility of high-energy disasters, and the resolution of the original adsorbed state gas in the coal body of the protected seam [12], which provides conditions for the extraction of gas from the protected seam. Gas threatens the safe production of coal mines [13][14][15], but it is also a clean energy source [16].…”

Section: Introductionmentioning

confidence: 99%

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The Physical Behavior of Protected Coal Seams Based on Triaxial Unloading Conditions

Chen,

Xue,

Guo

et al. 2024

Sustainability

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Protective seam mining is the most economical and effective measure for eliminating coal and gas herniation. To study the unloading effect of the mining of a protective seam on the protected layer, and to better grasp the effect of the protective layer on the abatement, conventional triaxial tests were conducted on coal samples with the unloading of the axial pressure and the peripheral pressure. The results showed that, under the unloading path, the bias stress–axial strain curve showed a sudden upward trend upon unloading, and the slope of the curve increased suddenly, which was more obvious after the peripheral pressure exceeded 10 MPa; stress unloading before the peak accelerated the yielding of the specimen. Under the unloading test path, the deformation modulus of the coal samples decreased with the decrease in the perimeter pressure, while the damage factor and Poisson’s ratio increased with the decrease in the perimeter pressure. Compared to the conventional triaxial test, under the unloading condition, the cohesion of the coal samples at peak stress decreased by 93.41% and the angle of internal friction increased by 37.41%, while the cohesion at the moment of residual strength decreased by 89.60% and the angle of internal friction increased by 37.44°. The brittleness index of the coal samples under unloading conditions with a peripheral pressure of 5 MPa, 10 MPa, 15 MPa, and 20 MPa increased by 178.83%, 159.18%, 87.93%, and 63.89%, respectively, compared to the conventional triaxial test. It can be seen that the greater the enclosing pressure, the smaller the difference in the brittleness index of the coal body.

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Section: ( ) ( )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Physical Behavior of Protected Coal Seams Based on Triaxial Unloading Conditions

Chen,

Xue,

Guo

et al. 2024

Sustainability

Self Cite

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“…30 Mechanical properties of coal and rock material are loading approaches dependent. [31][32][33][34][35][36] Due to the roadway excavation and the rupture of the overlying rock layer occurring during the real coal mining process, 37,38 coal mass around mining areas is usually subject to various loading conditions, for instance, the stress impact, 39,40 stress concentration, 41,42 or stress relief. 43,44 This complicates the various instability and failure mechanisms of coal mass.…”

Section: Introductionmentioning

confidence: 99%

Effect of water on the damage and energy dissipation feature of coal under uniaxial cyclic loading–unloading condition

Song,

Zhao,

et al. 2023

Energy Science & Engineering

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To gain insight into the reduction mechanism of water on the dynamic destabilization failure character of coal under mining disturbance conditions, the effect of water on the damage and energy dissipation feature of coal was investigated via cyclic uniaxial compressive loading–unloading test, acoustic emission (AE) monitoring technology, and theoretical analysis. It manifests that the softening effect of water on the mechanical properties of coal is still remarkable, lower uniaxial compressive strength and elastic modulus, while greater axial strain and higher Poisson's ratio are observed under the cyclic loading–unloading condition. Water‐saturated specimens dissipate more energy during the cyclic loading–unloading process, which reduces the proportion of input energy accumulated in the coal mass, thus lowering the burst proneness of coal. A greater amount of damage generates in air‐dried specimens than that in water‐saturated specimens at the first cyclic loading–unloading cycle, while lower damage increments are observed in the following cycles. This may be the reason for the minimal energy dissipation of air‐dried specimens in the following cycles. The elastic modulus behaves logarithmically versus the increasing cyclic loading–unloading cycle counts. The energy dissipated due to the damage evolution and plastic deformation of coal specimens positively correlates with the energy released by AE activities, the AE energy in air‐dried specimens has a greater concentration around the peak axial stress and a stronger correlation with the dissipated energy. The cumulative AE energy and energy dissipation density are linearly correlated during the cyclic loading–unloading process, which indicates a possibility in estimating the damage evolution and the dynamic failure risk of coal via cumulative AE energy, under the cyclic loading–unloading condition.

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“…Ma et al 12 obtained the functional relationship between the coal thickness and the peak strength, energy index, and failure modes of the coal‐rock structural body. Du et al 13 analyzed the damage process of structural bodies with different coal thicknesses from the energy conversion perspective based on coal mine dynamic disasters. They analyzed the damage process from the energy conversion perspective of the coal‐rock structural body.…”

Section: Introductionmentioning

confidence: 99%

Effect of confining pressure strength on the characteristics of energy evolution and fatigue fracture of the coal‐rock structural body

Li,

Yue,

et al. 2023

Fatigue Fract Eng Mat Struct

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The stability of coal seam‐overlying strata is significant to the safety of coal mines. The coal‐rock height ratio and confining pressure strength affect the stability of coal seam‐overlying strata. The research purpose of this paper is to obtain the effects of confining pressure and coal‐rock height ratio on the mechanical properties, energy evolution characteristics, and damage variables of structural body through the uniaxial loading, uniaxial cyclic loading, and triaxial cyclic loading experiment. Based on the evolution characteristics of the energy, the concept of energy dissipation ratio is put forward, and the effect of height ratio and confining strength on the energy dissipation ratio are compared and analyzed. The research results of this paper can provide theoretical reference for exploring the stress and energy evolution of coal seam‐overlying strata during chamber excavation and working face mining.

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Energy Evolution Characteristics of Coal–Rock Composite Bodies Based on Unidirectional Load

Cited by 15 publications

References 46 publications

The Physical Behavior of Protected Coal Seams Based on Triaxial Unloading Conditions

The Physical Behavior of Protected Coal Seams Based on Triaxial Unloading Conditions

Effect of water on the damage and energy dissipation feature of coal under uniaxial cyclic loading–unloading condition

Effect of confining pressure strength on the characteristics of energy evolution and fatigue fracture of the coal‐rock structural body

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