Study on Mechanism of Rock Burst in Horizontal Section Mining of a Steeply Inclined Extra-Thick Coal Seam

Wang, Songwei; Cao, Anye; Wang, Zhengyi; Cao, Jinrong; Liu, Yaoqi; Xue, Chengchun; Guo, Wenhao

doi:10.2113/2022/7058797

Cited by 10 publications

(7 citation statements)

References 44 publications

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“…When coal is close to a fault structure, coal stress increases, and a rock burst is easily induced [9][10][11]. In Central and Western China, coal mining is characterized by thick roofs, large mining depths, high ground stresses, and complex structural conditions which may lead to rock burst disasters.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rock Burst Mechanism in Extra-Thick Coal Seam Controlled by Thrust Fault under Mining Disturbance

Yang,

Wei,

Chen

et al. 2024

Processes

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A fault is a common geological structure encountered in underground coal mining. Interactions between the discontinuous structure of a fault and mining activities are the key factors in controlling the rock bursts induced by the fault. It is of great importance to study the rock burst mechanism of an extra-thick coal seam under the combined influence of reverse faults and coal mining for the prediction and prevention of rock burst. In this study, we establish a sliding dynamics model of rock mass in a fault zone and analyze the mechanical distribution of fault-induced rock bursts under the combined action of mining disturbances. Additionally, we utilize theoretical calculation and a 3D numerical simulation method to clarify the rockburst mechanism in an extra-thick coal seam controlled by a thrust fault under mining disturbance and a fault. The results showed that the distribution range of the shear stress increment in the fault footwall was larger than that in the hanging wall, revealing a skewed distribution. The fault dip angle and mining thickness exhibit significant influence on the structure around the fault. With increases in the dip angle of the fault and mining thickness, the maximum vertical stress and peak stress first increase and then decrease. A position 80 m away from the fault is the dividing line between the fault-non-affected area and the fault-affected area. The 13,200 working face of the Gengcun coal mine is used as a case study to study the influence of mining disturbances on microseismic events. The results of this study are in good agreement with the theoretical calculations and numerical simulation results.

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Section: Introductionmentioning

confidence: 99%

Analysis of Rock Burst Mechanism in Extra-Thick Coal Seam Controlled by Thrust Fault under Mining Disturbance

Yang,

Wei,

Chen

et al. 2024

Processes

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“…analyzed the temporal-spatial evolution characteristics of dynamic failure in SIETCS and identified the stress concentration areas around the roadway. Wang et al (2022) studied the stress redistribution caused by horizontal section mining in SIETCS, and found that there is high shear stress in the bottom coal under the effect of "shear-clamping". Dynamic stress plays a critical role in MSTCBs (He et al, 2012;Dou et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism and control of coal bursts triggered by mining induced seismicity in steeply inclined and extra thick coal seam

Cao

et al. 2023

Front. Earth Sci.

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With the increase in mining depth, coal bursts have become a major challenge in the safe mining of steeply inclined and extra thick coal seams (SIETCSs). Based on a typical mining induced seismicity triggered coal burst (MSTCB) in SIETCS, a large-scale numerical model was developed using the Universal Distinct Element Code. The numerical model was calibrated and validated by laboratory results and field observations. The stress evolution, crack development and ejection velocity patterns in the MSTCB were analysed, and the effect of mining induced seismicity vibration velocity on the MSTCB was discussed. The results show that a triangular static stress concentration zone is formed in the coal on the roof side. And the high-energy mining induced seismicity leads to high dynamic stresses in the coal at the roof side rib and top of the headentry. Coal bursts occur under the superposition of static and dynamic stresses. The MSTCB results in tensile failure near the headentry surface and shear failure in the depth. The vibration velocity has a significant effect on the roof side rib and top of the headentry, while it has only a slight effect on the working face rib and bottom of the headentry. The dynamic stress and ejection velocity in the roof side rib and top of the headentry are positively correlated with the vibration velocity. Finally, measures for MSTCB prevention were proposed. The findings presented in this study can provide guidance for the prevention and control of MSTCBs in SIETCSs.

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“…The strength theory holds that as long as the stress on the material exceeds its strength limit, the material begins to damage. According to this principle, the early strength theory holds that stress concentration occurs around the roadway and stope [11]. The stiffness theory is derived from the test theory of the rigid testing machine, which holds that if the stiffness of the testing machine is less than the later deformation stiffness of the specimen, sudden instability failure will occur [12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Impact Resistance Tendency of Coal Mass with Different Water Content

Liu

Han

2022

Geofluids

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As a major hidden danger of mine safety production, the impact resistance tendency of rock seriously restricts the safety and high yield of coal mine. At the same time, as one of the puzzles of rock mechanics, it has been perplexing many domestic and foreign scholars since the recorded rock burst in South Stafford coal mine in 1738. At present, this research is relatively weak; so, it is different for economic and social benefits. The study of the impact resistance law and the antishock measures of water-bearing rocks are extremely meaningful. In order to deeply explore the impact resistance law of rock with different water content and the antishock support measures after roadway excavation, based on the previous research results of the previous research, the impact tendency of different coal samples was firstly tested by coal uniaxial compression experiment, judging and then calculating the damage characteristics of rock with different water content according to the obtained data, as one of the judgment basis of the impact law of coal mine. Secondly, according to the experimental data, the energy evolution characteristics are calculated and analyzed with the graph. Finally, the impact tendency of the rock under different moisture conditions is obtained.

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Study on Mechanism of Rock Burst in Horizontal Section Mining of a Steeply Inclined Extra-Thick Coal Seam

Cited by 10 publications

References 44 publications

Analysis of Rock Burst Mechanism in Extra-Thick Coal Seam Controlled by Thrust Fault under Mining Disturbance

Analysis of Rock Burst Mechanism in Extra-Thick Coal Seam Controlled by Thrust Fault under Mining Disturbance

Failure mechanism and control of coal bursts triggered by mining induced seismicity in steeply inclined and extra thick coal seam

Mechanical Behavior and Impact Resistance Tendency of Coal Mass with Different Water Content

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