Breaking and mining-induced stress evolution of overlying strata in the working face of a steeply dipping coal seam

Chi, Xiaolou; Yang, Ke; Wei, Zhen

doi:10.1007/s40789-020-00392-3

Cited by 45 publications

(23 citation statements)

References 15 publications

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“…Laboratory tests can visually reflect the mechanical properties, deformation, and failure evolution and stability characteristics of rock mass, and obtain visual knowledge that cannot be obtained by numerical simulation and verify the numerical simulation results [150][151][152][153][154][155]. Therefore, many scholars have investigated the dynamic failure characteristics of the surrounding rock based on laboratory tests.…”

Section: Dynamic Failure Characteristics Of Surrounding Rock Of Deep ...mentioning

confidence: 99%

Rockburst Precursors and the Dynamic Failure Mechanism of the Deep Tunnel: A Review

Chen

Zhang

et al. 2021

Energies

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With the rapid development of underground caverns in the fields of hydraulic engineering, mining, railway and highway, the frequency, and intensity of rockburst and dynamic instability have gradually increased, which has become a bottleneck restricting the safe construction of deep caverns. This paper presents a review of the current understanding of rockburst precursors and the dynamic failure mechanism of the deep tunnel. Emphasis is placed on the stability of the surrounding rock of the deep tunnel, the rockburst prediction method, and the dynamic failure characteristics of the surrounding rock of the deep tunnel. Throughout the presentation, the current overall gaps in understanding rockburst precursors and the dynamic failure mechanism of deep tunnels are identified in an attempt to stimulate further research in these promising directions by the research community.

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Section: Dynamic Failure Characteristics Of Surrounding Rock Of Deep ...mentioning

confidence: 99%

Rockburst Precursors and the Dynamic Failure Mechanism of the Deep Tunnel: A Review

Chen

Zhang

et al. 2021

Energies

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“…After mining, the caving rock mass rolls to the lower part of the working face due to gravity, forming nonuniform filling in the inclined direction. The working face's caving and compaction characteristics differ from those of the flat and gently inclined working faces [3,4]. The rib spalling of coal wall and roof caving in front of working face in large-dip-angle working face are urgent problems to be solved in the safe and efficient mining of large dip angle working face.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

Liu

et al. 2023

Geofluids

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The caving characteristics of the goaf significantly impact the mining stability of the working face. The coal-forming environment of the steeply dipping coal seam is complex. After mining, the caving rock mass rolls to the lower part of the working face due to gravity, and the caving compaction characteristics of the working face are different from those of the flat and gently inclined working face, taking Huainan Xinji No. 2 Mine 211112 high-angle composite roof working face large-area gang roof fall area as the engineering background. To safely pass through a large roof fall area, a FLAC3D numerical simulation method considering the goaf’s compaction effect and the excavation’s additional damage is proposed. The Weibull distribution function is introduced to modify the elastic modulus parameters of the rock mass after excavation, which more accurately reflects the damage process of the rock mass after hole. Based on the goaf compaction theory, the elastic model is developed for the second time, and the accurate simulation of the caving rock mass is realized. On this basis, the proposed numerical simulation method is used to simulate the large-area roof caving of the large-angle working face, a scheme to control the stability of the working face by using the paste filling technology is proposed, and the material parameters of the filling body are determined. The research results show that when the water-cement ratio of the backfill is 3 : 1, the simulation and field trial results are good, and the safe and efficient mining of the large-angle composite roof working face is realized, which verifies the feasibility and correctness of the coupled simulation method. At the same time, the research results can provide a reference for controlling the roof fall area of the working face with a large inclination angle.

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“…Steeply inclined coal seams have special characteristics due to their geological deposition structure that is prone to roof deformation, energy accumulation, and stress evolution with asymmetric characteristics during working face mining [27][28][29]. Most of the existing research results focus on roof stability and roof energy distribution during the mining of large inclination coal seams, while studies on the coal burst mechanism are relatively few [30][31][32].…”

Section: Introductionmentioning

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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Breaking and mining-induced stress evolution of overlying strata in the working face of a steeply dipping coal seam

Cited by 45 publications

References 15 publications

Rockburst Precursors and the Dynamic Failure Mechanism of the Deep Tunnel: A Review

Rockburst Precursors and the Dynamic Failure Mechanism of the Deep Tunnel: A Review

Numerical Simulation Study on Stability Control Technology of Large-Area Wall Caving Area (LAWCA) in Large-Inclined Face

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

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