Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Tai, Lianhai; Li, Chong; Gu, Shitan; Yu, Xiaoxiao; Xu, Zhijun; Sun, Lei

doi:10.1038/s41598-023-45904-8

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…Therefore, the safety of underground engineering should be given special attention. Currently, engineering cases have shown that rock burst accidents can affect the normal operation and basic life and property safety of construction projects [11][12][13][14][15]. Therefore, rock burst risk assessment, as an important component of engineering risk assessment, can no longer be ignored, and the research on rock burst risk assessment technology has important theoretical and engineering practical significance.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment and Analysis of Rock Burst under High-Temperature Liquid Nitrogen Cooling

Cai,

Ma,

Teng

et al. 2024

Water

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Rock burst, an important kind of geological disaster, often occurs in underground construction. Rock burst risk assessment, as an important part of engineering risk assessment, cannot be ignored. Liquid nitrogen fracturing is a new technology used in the geological, oil, and gas industries to enhance productivity. It involves injecting liquid nitrogen into reservoir rocks to induce fractures and increase permeability, effectively reducing rock burst occurrences and facilitating the flow of oil or gas toward the wellbore. The research on rock burst risk assessment technology is the basis of reducing rock burst geological disasters, which has important theoretical and practical significance. This article examines the temperature treatment of two types of rocks at 25 °C, 100 °C, 200 °C, 300 °C, and 400 °C, followed by immersion in a liquid nitrogen tank. The temperature difference between the liquid nitrogen and the rocks may trigger rock bursting. The research focused on analyzing various characteristics of rock samples when exposed to liquid nitrogen. This included studying the stress–strain curve, elastic modulus, strength, cross-section analysis, wave velocity, and other relevant aspects. Under the influence of high temperature and a liquid nitrogen jet, the wave velocity of rocks often changes. The structural characteristics and possible hidden dangers of rocks can be understood more comprehensively through section scanning analysis. The stress–strain curve describes the deformation and failure behavior of rocks under different stress levels, which can help to evaluate their stability and structural performance. The investigation specifically focused on the behavior of rocks subjected to high temperatures and liquid nitrogen. By analyzing the stress–strain curves, researchers were able to identify the precursors and deformation processes that occur before significant deformation or failure. These findings have implications for the mechanical properties and stability of the rocks.

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Section: Introductionmentioning

confidence: 99%

Risk Assessment and Analysis of Rock Burst under High-Temperature Liquid Nitrogen Cooling

Cai,

Ma,

Teng

et al. 2024

Water

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Study on the Overburden Movement Law in Strip Filling Mining of Upward Mining Faces

Huang,

Guan,

Guan

et al. 2024

Preprint

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Strip filling mining can effectively improve the recovery rate of coal resources and promote the healthy development of the coal industry. To explore the movement patterns of overburden in strip filling mining, this study takes a mine in Tuokexun as the research object and employs theoretical analysis, numerical simulation, and similar experiments to investigate the stability of the composite structure in upward mining faces and the stress distribution and fracture characteristics of the overburden at different stages of strip filling mining. The results indicate that when the width of the isolation coal pillar is set at 15 m and the filling body width is 150 m, a stable supporting structure can be formed. During the filling mining stage, the range of overburden damage presents an upward-tilting trapezoidal distribution, yet remains overall intact, significantly reducing the probability of impact hazards. In the collapsed mining stage, the initial fracture step distances of the immediate roof and basic roof are 40 m and 80 m, respectively, with a periodic fracture step distance of 20 m. The overburden displacement is relatively gentle, and the degree of stress concentration is low, which is beneficial for the stability and safety of underground mining.

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Stress Evolution and Rock Burst Prevention in Triangle Coal Pillars under the Influence of Penetrating Faults: A Case Study

Guo,

Ma,

Wen

et al. 2024

Applied Sciences

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The occurrence of rock bursts due to penetrating faults are frequent in China, thereby limiting the safe production of coal mines. Based on the engineering background of a 501 working face in a TB coal mine, this paper investigates stress and energy evolution during the excavation of this working face due to multiple penetrating faults. Utilizing both theoretical analysis and numerical simulations, this study reveals the rock burst mechanism within the triangular coal pillar influenced by the penetrating faults. Based on the evolution of stress within the triangular coal pillar, a stress index has been devised to categorize both the rock burst danger regions and the levels of rock burst risks associated with the triangular coal pillar. Furthermore, targeted stress relief measures are proposed for various energy accumulation areas within the triangular coal pillar. The results demonstrate that: (1) the superimposed tectonic stress resulting from the T6 and T5 penetrating faults exhibits asymmetric distribution and has an influence range of about 90 m in the triangular coal pillar, reaching a peak value of 11.21 MPa at a distance of 13 m from the fault plane; (2) affected by the barrier effect of penetrating faults, the abutment stress of the working face is concentrated in the triangular coal pillar, and the magnitude of the abutment stress is positively and negatively correlated with the fault plane barrier effect and the width of the triangular coal pillar, respectively; (3) the exponential increase in abutment stress and tectonic stress as the width of the triangular coal pillar decreases leads to a high concentration of static stress, which induces pillar burst under the disturbance of dynamic stress from fault activation; (4) the numerical simulation shows that when the working face is 150 m away from the fault, the static stress and accumulated energy in the triangle coal pillar begins to rise, reaching the peak at 50 m away from the fault, which is consistent with the theoretical analysis; (5) the constructed stress index indicates that the triangular coal pillar exhibits moderate rock burst risks when its width is between 73 to 200 m, and exhibits high rock burst risks when the width is within 0 to 73 m. The energy accumulation pattern of the triangular coal pillar reveals that separate stress relief measures should be implemented within the ranges of 50 to 150 m and 0 to 50 m, respectively, in order to enhance the effectiveness of stress relief. Blasting stress relief measures for the roof and coal are proposed, and the effectiveness of these measures is subsequently verified.

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Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Cited by 3 publications

References 38 publications

Risk Assessment and Analysis of Rock Burst under High-Temperature Liquid Nitrogen Cooling

Risk Assessment and Analysis of Rock Burst under High-Temperature Liquid Nitrogen Cooling

Study on the Overburden Movement Law in Strip Filling Mining of Upward Mining Faces

Stress Evolution and Rock Burst Prevention in Triangle Coal Pillars under the Influence of Penetrating Faults: A Case Study

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