Progressive mitigation method of rock bursts under complicated geological conditions

Guo, Wei‐yao; Zhao, Tianfeng; Tan, Yunliang; Yu, Fenghai; Hu, Shengmin; Yang, Fuqiang

doi:10.1016/j.ijrmms.2017.04.011

Cited by 130 publications

(57 citation statements)

References 30 publications

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“…Rock burst is essentially a dynamic failure of coal-rock combined body under the mining disturbance [2][3][4][5]. In order to investigate the mechanical properties and failure modes of coal-rock combined body, many researchers have done a lot of experimental researches [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of High Loading Rate on the Behaviour and Mechanical Properties of Coal‐Rock Combined Body

Gong

Hao

Luo

2018

Shock and Vibration

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In order to investigate the high loading rate effect on the behaviour and mechanical properties of coal-rock combined body, the dynamic compressive tests were conducted by using the Split-Hopkinson Pressure Bar (SHPB) device under the loading rate range from 2.7×10 5 MPa/s to 4.0×10 5 MPa/s. The stress-strain curves, dynamic peak stress and strain, elastic modulus, and energy distribution law of coal-rock combined body under different loading rates were analyzed and discussed. The results show that the dynamic stress-strain curves of coal-rock combined body have a double-peak feature under high loading rate range, which can be divided into the initial bearing stage, the bearing decline stage, the bearing enhance stage, and the unstable stage. The first peak stress of the coal-rock combined body is independent of the loading rate, while the dynamic compressive strength (the second peak stress) and dynamic peak strain (the second peak strain) have a strong loading rate effect and will generally increase linearly with the loading rate. The first and second elastic moduli of coal-rock combined body are not sensitive to the loading rate. With the increase of the loading rate, the incident energy and reflective energy of coal-rock combined body increase rapidly, while the change of transmitted energy is very small. The absorption energy ratio of the coal-rock combined body shows a good linear law with the incident energy under different loading rates.

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Section: Introductionmentioning

confidence: 99%

The Effect of High Loading Rate on the Behaviour and Mechanical Properties of Coal‐Rock Combined Body

Gong

Hao

Luo

2018

Shock and Vibration

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“…The effect of shear stress/displacement on nonlinear flow characteristics was not taken into account. Rock fractures are often subject to shear resulting from various natural and human activities . During fracture shearing, the shear‐induced dilation and mismatching of fracture surfaces cause contact spot changes and aperture distributions, which influence the flow and transport behaviors in rough‐walled fractures.…”

Section: Introductionmentioning

confidence: 99%

“…Rock fractures are often subject to shear resulting from various natural and human activities. [40][41][42][43][44][45][46] During fracture shearing, the shear-induced dilation and mismatching of fracture surfaces cause contact spot changes and aperture distributions, which influence the flow and transport behaviors in rough-walled fractures. Therefore, studying the effect of shear process on nonlinear flow behavior in rough-walled fractures is highly important.…”

Section: Introductionmentioning

confidence: 99%

Effect of shearing on hydraulic properties of rough‐walled fractures under different boundary conditions

Wang

Jiang

Luan

et al. 2019

Energy Science & Engineering

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This study experimentally investigated nonlinear flow characteristics of rough‐walled fractures during shear process under different boundary conditions, using the servo‐controlled shear‐flow apparatus. A series of shear‐flow tests were conducted on two types of rough fractures with different shear displacements under various boundary conditions. The effects of shear process, fracture surface roughness, boundary normal stiffness, and initial normal stress on nonlinear flow behaviors are analyzed. The results show that Forchheimer equation provides a good description of the nonlinear relationship between flow rate and pressure gradient in rough‐walled fractures. The linear and nonlinear coefficients decrease by 1‐2 and 2‐3 orders of magnitude during shear, respectively. Both the mechanical aperture and the hydraulic aperture increase with increasing shear displacement. The mechanical aperture is always larger than the hydraulic aperture, and their difference gradually increases with the increment of shear displacement. The contact area ratio exhibits a fast decrease as shear displacement ranges between 1 and 3 mm and then decreases gradually with the decreasing rate generally diminishes. With the increase in shear displacement, the critical Reynolds number shows an increasing trend. The critical Reynolds number is in range 3.22‐35.41 for fracture G1 and 1.23‐12.35 for fracture G3. As the boundary normal stiffness and initial normal stress increase, the critical Reynolds number decreases.

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“…Coal burst in an underground coal mine is mainly expressed in the form of sudden coal pillar yield, instantaneous vibration, and causes massive destruction of macroscopic characteristics [1][2][3][4]. It has been a long-term objective of the mining community to pursue safety, while maintaining high productivity and efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…According to bursting liability theory, the mechanisms of rock burst exhibit differences even under the same condition [4,12]. To evaluate the rock burst liability properly, the so-called bursting liability indicators are employed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Assessment of the Influences of Gas Pressure on Coal Burst Liability

Zhao

Kaunda

2018

Energies

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When coal mines exploit deep seams with high-gas content, risks are encountered due to the additional high likelihood of rock bursting potential problems. The bursts of coal pillars usually lead to severe fatalities, injuries, and destruction of property, including impeding access to active mine workings underground. The danger exists given that conditions in the already highly brittle coal material can be exacerbated by high stress and high gas pressure conditions. It is thus critical to develop methods that improve current understanding about bursting liability, and techniques to forecast or prevent coal bursting in underground coal mines. This study uses field data from a deep coal mine, and numerical modeling to investigate the effects of gas pressure and mechanical compressive stresses on coal bursting liability in high gas content coal seams. The bursting energy index is adopted to determine the coal bursting liability under high gas pressure conditions. The adopted methodology uses a two-staged approach comprising investigating the influence of gas pressure on the bursting liability of coal pillar, and the influence of the gas pressure on the resulting pillar failure mode. Based on numerical simulations of coal pillars, correlations are observed between the magnitudes of gas pressures and the bursting energy index. Irrespective of pillar size, failure time is shortest when the gas pressure achieves a threshold value between 50 kPa to 70 kPa. At 50 kPa, the value of the BEI increases by 50% going from the 4 m pillar to the 6 m pillar. The value of the BEI increases by 43% going from the 6 m high pillar to the 8 m high pillar at 50 kPa. When pillars fail there is a degree of stress relief leading to a reduction in bursting liability. The results suggest that before 50 kPa, pillar failure is largely due to mechanical loading. After 50 kPa, pillar failure is largely due to excessive gas pressures.

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Progressive mitigation method of rock bursts under complicated geological conditions

Cited by 130 publications

References 30 publications

The Effect of High Loading Rate on the Behaviour and Mechanical Properties of Coal‐Rock Combined Body

The Effect of High Loading Rate on the Behaviour and Mechanical Properties of Coal‐Rock Combined Body

Effect of shearing on hydraulic properties of rough‐walled fractures under different boundary conditions

Numerical Assessment of the Influences of Gas Pressure on Coal Burst Liability

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