Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Zhao, Yichao; Gao, Mingshi; He, Yongliang; Xu, Dan

doi:10.1155/2019/3735427

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…Zhao et al 9 studied and analyzed the peak strength, strain, and failure mode of the coal‐rock structural body with the different structural plane inclination angles and established the energy evolution computational model of the structural body. Dong et al 10 obtained the relationship between loading rate and peak strain, strength, and crack number.…”

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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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 influence of rock-to-coal strength ratio and height ratio on the impact trend, failure mode, and ultimate compressive strength characteristics of the composite sample have been analyzed thoroughly from a mesoscopic perspective [22]. Zhao et al analyzed the failure characteristics of CR (Coal Rock association) assemblies with various inclination angles (0 °, 15 °, 30 °, and 45 °), analyzed their failure mechanisms [23]. Wu et al conducted experiments on RCB specimens with different angles under different stress states, and found that the fracture tendency of RCB specimens increased with the increase of angle [24].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Rock–Coal–Rock Composites at Different Inclined Coal Seam Thicknesses

Wang

et al. 2022

Front. Phys.

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A comprehensive understanding of the mechanical properties of coal and rock sections is necessary for interpreting the deformation and failure modes of such underground sections and for evaluating the potential dynamic hazards. However, most studies have focused on horizontal coal–rock composites and the mechanical properties of inclined coal–rock composites have not been considered. To explore the influence of different confining pressures and inclined coal seam thicknesses on the mechanical properties and failure characteristics of rock–coal–rock (RCR) composites, a numerical model based on the particle flow code was used to perform simulations on five inclined RCR composites at different confining pressures. The results show that the mechanical properties and failure characteristics of the RCR composites are affected considerably by the inclined coal seam thickness and the confining pressure. (1) When the inclined coal seam thickness is constant, the elasticity modulus of the inclined RCR composite increases nonlinearly with the confining pressure at first, and then remains constant. At the same confining pressure, the elasticity modulus of the inclined RCR composite decreases nonlinearly with the inclined coal seam thickness. (2) When the confining pressure is constant, the peak stress of the inclined RCR composite decreases with the increase of the inclined coal seam thickness. When the inclined coal seam thickness is constant, the peak stress increases with the confining pressure. (3) As the inclined coal seam thickness increases, the peak strain of the inclined RCR composite first decreases rapidly, and then remains constant when there is no confining pressure. When the confining pressure is between 5 and 20 MPa, the peak strain of the inclined RCR composite gradually increases. (4) In the absence of confining pressure, there are few microcracks in the rock at an inclined coal seam thickness of 10 mm, whereas all the other cracks are in the coal section. When the confining pressure ranges between 5 and 20 MPa, the failure modes of the RCR composite can be divided into Y- and X-types.

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Mechanical Properties and Damage Characteristics of Coal-Rock Combination with Different Dip Angles

et al. 2021

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Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Cited by 4 publications

References 47 publications

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

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

Mechanical Properties of Rock–Coal–Rock Composites at Different Inclined Coal Seam Thicknesses

Mechanical Properties and Damage Characteristics of Coal-Rock Combination with Different Dip Angles

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