Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

He, Zhi-Long; Lu, Cai‐Ping; Zhang, Xiufeng; Guo, Ying; Meng, Zhao-He; Xia, L.

doi:10.1007/s00603-022-03002-7

Cited by 27 publications

(7 citation statements)

References 32 publications

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“…Additionally, the mechanical properties of deep-buried rock mass are evidently different from that of superficial rock mass [7,8]. High-intensity deep coal mining inevitably causes disasters, e.g., rockbursts, water inrush, coal and gas outbursts, and roof-fall accidents [9][10][11][12][13][14][15][16]. Mining-induced disasters destroy underground structures and equipment and threaten the safety of underground workers.…”

Section: Introductionmentioning

confidence: 99%

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Liu,

Wang,

Kou

et al. 2024

Applied Sciences

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China’s coal mines have to extend to greater depths for the exploitation of more mineral resources, and they have suffered catastrophic mining-induced disasters, such as rockbursts, water inrushes, coal and gas outbursts, and roof fall accidents. The microseismic monitoring technique is a practical tool for mine safety management, which is extensively utilized in many Chinese coal mines. Microcracks of coal/rock masses are recorded as microseismicities in the field, and the potential mining-induced instabilities can be assessed by in-depth analysis of the microseismic parameters. This study provides a state-of-the-art review of the achievements and developments of the microseismic monitoring technique in coal mines. It also presents some prospects for improving the location accuracy of microseismicity, efficient and intelligent processing of the microseismic data, comprehensive assessment of coal/rock instabilities, and development of new microseismic monitoring equipment. This study is valuable for mine safety management and may contribute to improving the deep mining production.

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Section: Introductionmentioning

confidence: 99%

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Liu,

Wang,

Kou

et al. 2024

Applied Sciences

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“…Du et al 27 used multiple coupling methods of theoretical analysis, field monitoring, numerical simulation, and engineering verification to explore the mechanism of rockburst in a fully mechanized caving face under the condition of coal seam left behind by a hard roof. He et al 28 simulated the complete process of rockburst induced by mine tremors using UDEC discrete element numerical simulation, revealing the entire dynamic process from generation and propagation to triggering of rockbursts caused by mine tremors and exploring the rockburst risks under different geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact Failure Rules of Roadway Floor Induced by Dynamic Load Disturbance under Extremely Thick Conglomerate

Xu,

Dai,

2024

ACS Omega

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The dynamic load resulting from the fracture of extremely thick rock layers directly influences the surrounding rock layers within stopes and roadways, thereby inducing rockburst disasters. Hence, studying the tunnel floor's impact and ground pressure induced by dynamic load disturbance under extremely thick conglomerates is crucial. This study focuses on the 23130 working face of Yuejin Coal Mine as its engineering background. Initially, through similar simulation experiments, the impact characteristics of dynamic load disturbance positions under thick conglomerates on tunnel bottom damage are investigated. Building upon this foundation, finite element numerical simulation is employed to explore the further conglomerate thickness' impact on tunnel floor damage under dynamic load disturbance. Lastly, the accuracy of similar and numerical simulation results is validated by incorporating field examples. Findings reveal that dynamic load disturbance leads to an instantaneous increase in coal and rock mass acceleration in the roof and floor of roadways, followed by a decrease to an equilibrium state, thereby subjecting the interior to high static load conditions. The thickness of conglomerate in the overlying rock layer emerges as a crucial factor affecting tunnel floor rockburst incidents. With dynamic load disturbance, as conglomerate thickness increases, the stress concentration area of the tunnel floor gradually shifts to deeper rock strata. Effective control of tunnel floor rockbursts can be achieved by implementing support measures like anchor rods and cables and managing tunnel deformation and damage under dynamic loads. Dynamic load disturbance under extremely thick conglomerates emerges as a pivotal condition for inducing tunnel floor impact damage. This study provides a theoretical foundation for the safe excavation of similar mine tunnels and for implementing rockburst prevention and control measures.

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“…Strong mining tremors cause roadway rock burst [1][2][3][4], leading to instability and deformation of the roadway roadway-surrounding rock and failure of in the support, affecting production safety, and causing casualties and substantial economic losses [5][6][7]. He et al [8] studied hard thick roof-inducing coal bursts in coal mines and proposed that the seismic events occurring when roof breaking acts on the roadway surrounding rock in the form of stress waves, which play a significant role in the deformation and instability.…”

Section: Introductionmentioning

confidence: 99%

Seismic Mitigation Effect of Overlying Weakening Strata in Underground Coal Mines

et al. 2023

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Artificial construction of a weakening zone over the roadway is an essential method for preventing coal bursts and rock bursts caused by strong mining tremors. However, concerning the seismic absorption and load reduction capabilities of an artificial structural weakening zone, the degree of rock mass damage to the roadway under weakening zone protection remains unclear. This study employed principles of elasticity and UDEC (Universal Distinct Element Code) to explore the seismic attenuation and load reduction capabilities of the weakening zone. The results indicate that the absorbing ability of the weakening zone increases exponentially with its weakening coefficient. Under the same dynamic load disturbance, when the weakening coefficient rises from 0.00 to 0.99, the sidewall displacement from the elastic wave source side changes from 0.400 m to 0.228 m. The total number of cracks in the roadway-surrounding rock, and the ranges of overstressed zones decreased linearly. The critical threshold of the roadway resisting the mining tremor disturbance increased. In particular, when the mining tremor is located directly above the roadway, the initial deformation of the roof is the largest, and the cumulative deformation of the rib is greater than the roof. By creating a weakening zone with a coefficient exceeding 0.95, the roadway remains unaffected by the 20 MPa dynamic loading. The study provides a theoretical basis for controlling coal burst that is triggered by mining tremors.

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Numerical and Field Investigations of Rockburst Mechanisms Triggered by Thick-Hard Roof Fracturing

Cited by 27 publications

References 32 publications

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Study on the Impact Failure Rules of Roadway Floor Induced by Dynamic Load Disturbance under Extremely Thick Conglomerate

Seismic Mitigation Effect of Overlying Weakening Strata in Underground Coal Mines

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