Mechanism and Prevention Practice of Coal Burst in Deep Gradual Residual Coal Pillar Area: A Case Study

Xue, Chengchun; Cao, Anye; Liu, Yaoqi; Guo, Wenhao; Wen, Yuezhong; Hu, Yang; Gao, Xiaopeng

doi:10.1007/s12517-022-09527-z

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The layout of the roof blast holes is shown in Figure 17, and the blast hole parameters are shown in 14 Geofluids inversion evaluation index can make a dynamic evaluation of the impact hazard of the working face [41][42][43]. The higher the P-wave velocity (VP) of the coal-rock layer of the working face, the larger the positive anomaly coefficient A n of the wave velocity, indicating that the higher the stress level of the surrounding rock in the area, the more serious the risk of coal burst [44][45][46]. In abnormal stress areas of thick coal seams with large dip angles, coal burst risk is primarily dominated by static stress.…”

Section: Prevention and Control Of Coal Burst Inmentioning

confidence: 99%

Mechanism and Energy Evolution Characteristics of Coal Burst in Mining Thick, Deep, and Large Inclined Coal Seams: A Case Study from a Chinese Coal Mine

et al. 2022

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Coal burst is a severe and dynamic hazard, and understanding its mechanism is crucial in preventing such incidents. Strong tremors during the working face mining in the stress anomaly zone of the pinch-out coal seam are frequent. Theoretical analysis, numerical simulation, and field measurement methods are used to analyze the energy evolution law for mining at the working face and mechanism of coal burst. Mechanical models of the inclined and strike overhang structures are established, and the theoretical analysis of the strike and inclined energy distribution characteristics of the working face roof is carried out. The two key areas with a high overhang bending deformation energy accumulation are identified at the lower end and middle-upper part of the working face. The simulation results show that the energy accumulation area of the roof in the inclined coal seam has prominent asymmetric distribution characteristics. The roof energy accumulates in the lower end and middle-upper area of the working face. The floor energy accumulates in the lower end area of the working face, and the peak position of the overhead energy of the working face in the direction shifts toward the coal-wall side. Influenced by the local absence of the No. 8 coal seam, the vertical stress of the surrounding rock at the working face of the massive, inclined coal seam increased by 12.7%; the peak of roof energy at the working face inclination and strike increased by 46.2% and 32.2%; and the range of roof energy accumulation expanded. A deep directional hole blasting plan to prevent the phenomenon at the working face roof is developed, which effectively reduces the stress and energy level of the inclined hanging roof and avoids the occurrence of coal bursts in the abnormal stress area of the working face.

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Section: Prevention and Control Of Coal Burst Inmentioning

confidence: 99%

Mechanism and Energy Evolution Characteristics of Coal Burst in Mining Thick, Deep, and Large Inclined Coal Seams: A Case Study from a Chinese Coal Mine

et al. 2022

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“…The occurrence of rockbursts is influenced by various factors and is characterized by a regional distribution (Wang et al, 2021a;Cao et al, 2021;Chen et al, 2021). As the depth of mining deepens, the number and frequency of rockbursts in mines increase (Yu et al, 2021;Xue et al, 2022). There are distinctive rockburst modes under different conditions of mining areas, mines, coal seams, structures, and stresses.…”

Section: Introductionmentioning

confidence: 99%

Regional prediction and prevention analysis of rockburst hazard based on the Gaussian process for binary classification

et al. 2022

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Rockburst is a complex dynamic disaster in coal mining and affected by many factors. To accurately predict the rockburst hazard among complex influencing factors, a prediction model of rockburst hazard based on the Gaussian process for binary classification (GPC) was proposed after the identification of the intrinsic relationship between multiple factors of coal mines and rockburst. Through computerized machine learning and integrated intelligent analysis, the non-linear mapping of rockburst hazard and its influencing factors was established. The multi-factor pattern recognition model was constructed using artificial intelligence. The prediction criteria of the rockburst hazard probability and the hazard probability value of the prediction area unit were determined by applying neural network and fuzzy inference methods. In addition, the rockburst hazardous zone was classified, and the corresponding technical scheme for the prevention was put forward. The validity and feasibility of the regional prediction of rockburst hazard based on GPC were verified in the engineering practice. This method is highly targeted and can improve the accuracy and precision of rockburst prediction, thus contributing to the safe and efficient production of coal mines.

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“…Jiang et al, [25] studied the destabilization mechanism of an isolated island working face in combination with dynamic change process of irregular goaf structure on both sides of the coal pillar working face. Xue et al, [26] studied the rock burst mechanism in a deep irregular isolated island coal pillar area and formulated a pressure relief scheme under dynamic and static load. Du et al, [27] simulated and analyzed the stress distribution rule of coal rock mass with different structural forms in the context of goaf roadway beneath the residual coal seam of hard roof.…”

Section: Introductionmentioning

confidence: 99%

Study on Occurrence Mechanism and Prevention Technology of Rock Burst in Narrow Coal Pillar Working Face under Large Mining Depth

Chen

et al. 2022

Sustainability

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This paper presents a collaborative control scheme involving “unloading-solidifying” to prevent rock bursts during narrow pillar recovery at large mining depths. In this study, the stress distribution rule of coal rock mass during the excavation and mining process is studied, and the energy accumulation characteristics of the overlying hard and thick roof structure are investigated. In this way, the rock burst inducing mechanism of the narrow coal pillar working face under complex conditions is investigated. The results show that the peak lateral bearing pressure of the goaf and the maximum horizontal principal stress provide the static load condition for the occurrence of rock burst during roadway excavation. Affected by the superposition of “near-field high static load + far-field dynamic load”, it is extremely easy to reach the critical destabilization value during the mining period at the narrow coal pillar working face. According to the monitoring results, the developed coordinated control scheme, which focuses on the strong pressure relief and strong support in near-field high-bearing pressure coal mass and the pressure relief in far-field high-level hard roof with an advanced pre-cracking roof, can effectively avoid the occurrence of rock burst accidents on narrow coal pillar working face.

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Mechanism and Prevention Practice of Coal Burst in Deep Gradual Residual Coal Pillar Area: A Case Study

Cited by 5 publications

References 24 publications

Mechanism and Energy Evolution Characteristics of Coal Burst in Mining Thick, Deep, and Large Inclined Coal Seams: A Case Study from a Chinese Coal Mine

Mechanism and Energy Evolution Characteristics of Coal Burst in Mining Thick, Deep, and Large Inclined Coal Seams: A Case Study from a Chinese Coal Mine

Regional prediction and prevention analysis of rockburst hazard based on the Gaussian process for binary classification

Study on Occurrence Mechanism and Prevention Technology of Rock Burst in Narrow Coal Pillar Working Face under Large Mining Depth

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