Influence of stress distribution in coal seams of non-uniform extremely thick key stratum and disaster-causing mechanisms

Ning, Shan; Zhu, Weiren; Xie, Jianlin; Song, Shikang; Wang, Xiaozhen; Yu, Dan; Lou, Jinfu; Xu, Jialin

doi:10.1038/s41598-022-18641-7

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…With a thickness of 400 m (Figure 14a), the deflection is minimal at a span of 800 m. This theoretical analysis result is consistent with the experimental results shown in Section 4.2. It also agrees with the field survey data that have suggested a maximum surface subsidence of only 0.44 m after Panels 201-204 were mined out (the total excavation width is 720 m) [36].…”

Section: Further Analysis With Analytical Models 61 Influence Of Utks...supporting

confidence: 90%

A Carbon Nanocomposite Material Used in the Physical Modelling of the Overburden Subsidence Process

Xie,

Ning,

et al. 2023

Nanomaterials

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Carbon nanomaterial is widely used in structural health monitoring due to the advantage of sensitivity and good mechanical properties. This study presents a novel approach employing carbon nanocomposite materials (CNMs) to characterize deformation and damage evolution in physical modelling. As the primary measurement method, the CNM is used to investigate the deformation characteristics of a 200–400 m thick sandstone bed at a 1 km deep longwall mine. The sandstone unit is identified as an ultra-thick key stratum (UTKS), with its thicknesses varying across different mining panels of the UTKS. The results of CNM monitoring show that the UTKS remains stable even after a consecutive excavation of 900 m in width. This stability impedes the upward propagation of overlying strata failure, leading to minimal surface subsidence. The study demonstrates the huge potential of CNM in the mining area, which can be useful for investigating material damage in physical modelling studies. The findings suggest that the cumulative extraction width in individual mining areas of the mine should be controlled to avoid a sudden collapse of the UTKS, and that special attention should be paid to where the UTKS’s thickness changes substantially. The substantial variation in UTKS thickness significantly impacts the pattern of overburden subsidence.

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Section: Further Analysis With Analytical Models 61 Influence Of Utks...supporting

confidence: 90%

A Carbon Nanocomposite Material Used in the Physical Modelling of the Overburden Subsidence Process

Xie,

Ning,

et al. 2023

Nanomaterials

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“…Rock burst is a dynamic disaster phenomenon caused by sudden release of elastic deformation energy gathered in underground engineering surrounding rocks resulting from excavation or other external disturbances, which is extremely destructive and seriously threatens the safe and efficient production of coal mines. And it is one of the important disasters faced by coal mining at home and abroad [1][2][3][4]. For deep mining [5], the ground stress is always at a high level due to the high elastic energy stored in the rock.…”

Section: Introductionmentioning

confidence: 99%

Study on Bursting Liability of Coal-like Material with Pores and Anchors Based on Impact Kinetic Energy Characteristics

Jiang

Jia

Wang³

et al. 2023

Sustainability

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Drilling unloading, and bolt support are widely used in the practice of coal mine roadway engineering as the means of impact prevention and support. However, the evaluation index of intact coal body is still used in bursting liability evaluation, and the evaluation results obtained do not match with the actual dynamic phenomena in the field, resulting in inaccurate evaluation results and even bringing serious impact accidents. In this paper, uniaxial compression and uniaxial loading/unloading tests are conducted on specimens in different states, and common evaluation indexes are used to evaluate the bursting liability of specimens in different states, and the impact kinetic energy of crushed blocks during uniaxial compression is calculated. Based on this, the bursting liability criterion based on the impact kinetic energy of the crushed block is established and the common bursting liability evaluation index is modified. The bursting liability obtained by the bursting liability discrimination criterion based on the impact kinetic energy of the crushed block is more consistent with the laboratory dynamic phenomena. Therefore, the bursting liability evaluation results based on the impact kinetic energy of the crushed block are more consistent with the actual engineering. And the numerical simulation results verify the correctness of the bursting liability criterion based on the impact kinetic energy of the crushed block.

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“…Strata movement and stress evolution when mining two overlapping panels affected by hard stratum have been studied [10]. An analysis of the distribution characteristics of the primary key stratum in the coal mine revealed the bow-shaped structural characteristics of the overlying thick primary key stratum [11]. The mechanism, prevention measures, and control methods for earthquake disasters typically occurring in mines with thick and hard rock strata were investigated [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

et al. 2023

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When there are multiple key strata in the overburden of a deep coal seam and the surface subsidence coefficient after mining is small, this indicates that the overlying key strata fail to break completely after mining. On this occasion, stress is easily concentrated in the working face, which in turn leads to the occurrence of dynamic disasters such as rock bursts. This study adopted a comprehensive analysis method of field monitoring and numerical simulations to explore the influence of the key stratum on the evolution law of mining-induced stress in the working face. A distributed optical fiber sensor (DOFS) and a surface subsidence GNSS monitoring system were arranged inside and at the mouth of the ground observation borehole, respectively. According to the monitoring results of strain obtained from the DOFS, the height of the broken stratum inside the overlying strata was obtained and according to the monitoring results of surface subsidence, the surface subsidence coefficient was proven to be less than 0.1, indicating that the high key stratum is not broken completely, but enters a state of bending subsidence instead. In order to reveal the influence of the key stratum on the mining-induced stress of the working face, two 3DEC numerical models with and without the key stratum were established for a comparative analysis. As the numerical simulation results show, when there are multiple key strata in the overburden, the stress influence range and the stress concentration coefficient of the coal seam after mining are relatively large. The study revealed the working mechanism of rock burst accidents after large-scale mining and predicted the potential area with a rock burst risk after mining of the working face, which was verified by field investigations. The research results are of great guiding significance for the identification of the working mechanism of rock bursts in deep mining condition and for their prevention and control.

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Influence of stress distribution in coal seams of non-uniform extremely thick key stratum and disaster-causing mechanisms

Cited by 6 publications

References 24 publications

A Carbon Nanocomposite Material Used in the Physical Modelling of the Overburden Subsidence Process

A Carbon Nanocomposite Material Used in the Physical Modelling of the Overburden Subsidence Process

Study on Bursting Liability of Coal-like Material with Pores and Anchors Based on Impact Kinetic Energy Characteristics

Influence of Key Strata on the Evolution Law of Mining-Induced Stress in the Working Face under Deep and Large-Scale Mining

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