Energy Accumulation Law of Different Forms of Coal-Rock Combinations

Article Environmental Sciences

Failure mechanism and control of the coal bursts triggered by mining-induced seismicity: a case study

Jinrong Cao et al.

Summary: This paper investigates the mechanism and control strategy of mining-induced seismicity-triggered coal bursts (MISTCB) based on a severe MISTCB that occurred in China. A large-scale numerical model is built to analyze the crack development and stress evolution of the MISTCB, as well as the effect of mining-induced seismicity amplitude. The study reveals that seismicity plays a key role in MISTCB, and increasing amplitude leads to higher dynamic stresses, ejection velocities, and deformations.

ENVIRONMENTAL EARTH SCIENCES (2023)

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Article Engineering, Geological

Use of machine learning algorithms to assess the state of rockburst hazard in underground coal mine openings

Lukasz Wojtecki et al.

Summary: This study uses machine learning algorithms to assess the rockburst hazard in a hard coal mine. The decision tree and neural network models are proven to be effective in distinguishing rockbursts from tremors with high accuracy.

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING (2022)

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Article

Justification of engineering solutions on reduction of occupational traumatism in coal longwalls

S.G. Gendler et al.

Mining Informational and Analytical Bulletin (2022)

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Article Geosciences, Multidisciplinary

Rock burst mechanism induced by stress anomaly in roof thickness variation zone: a case study

Xianxi Bai et al.

Summary: This study investigated the impact of roof thickness variation on rock bursts during longwall mining. The results revealed that a thicker roof led to higher initial stress and increased risk of rock bursts. Additionally, the thin roof zone had a higher likelihood of roof breakage, resulting in significant dynamic load and microseismic energy.

GEOMATICS NATURAL HAZARDS & RISK (2022)

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Article Mining & Mineral Processing

Failure Mechanism and Acoustic Emission Characteristics of Coal-Rock Samples

Dongming Guo et al.

Summary: This study investigates the failure mechanism and acoustic emission characteristics of coal-rock combinations with different coal-to-rock ratios. Uniaxial compression tests and acoustic emission tests were conducted, and parameters such as failure characteristics, stress-time curve, compressive strength, elastic modulus, acoustic emission events, and energy counts were analyzed. The results show that the destruction of the coal-rock assembly occurs in the coal body, and the degree of damage decreases with the increase of the coal-to-rock ratio. The shape of destruction changes from broken and collapsed to oblique shear failure. Stress jump and residual stress phenomena are observed in the coal-rock combination. The compressive strength and elastic modulus of the composite body decrease with the increase of coal-rock ratio, while the maximum axial strain increases. Acoustic emission events and energy counts show stage changes that match the stress-time curve.

JOURNAL OF MINING SCIENCE (2022)

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Review Engineering, Civil

Rockburst in underground excavations: A review of mechanism, classification, and prediction methods

Mahdi Askaripour et al.

Summary: Technical challenges in underground mining increase in complexity as mining goes deeper. One major challenge is rock mass stability and the risk of rockburst events. To overcome these challenges, advanced solutions and best practices must be developed. Rockbursts are common in underground mines and pose a threat to safety and operations. Understanding the conditions and mechanisms leading to rockbursts, and improving risk assessment methods, is necessary. This paper provides a summary of the current understanding of rockbursts in the mining industry, discusses their classifications and mechanisms, and reviews empirical prediction methods.

UNDERGROUND SPACE (2022)

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Article Mining & Mineral Processing

NONIMPACT ROCK PRESSURE REGULATION WITH ENERGY RECOVERY INTO THE HYDRAULIC SYSTEM OF THE LONGWALL POWERED SUPPORT

V. V. Gabov et al.

Summary: The paper proposes a four-level nonimpact regulation mode to increase the adaptability of the powered support unit hydraulic prop to roof rock subsidence. By using a nonimpact resistance control unit, specific operating modes of the hydraulic props are achieved.

EURASIAN MINING (2021)

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Article Engineering, Geological

Experimental Study on Energy Evolution and Failure Characteristics of Rock-Coal-Rock Combination with Different Height Ratios

Bao Pan et al.

Summary: The uneven deformation of surrounding rock in thin coal seam roadway poses challenges to mining operations. Through testing coal-rock combinations, it is found that the uniaxial compression strength increases with the coal height ratio. Energy dissipation decreases suddenly between certain ratios of coal to rock, and the failure mode shifts from splitting to shear failure.

GEOTECHNICAL AND GEOLOGICAL ENGINEERING (2021)

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Article Engineering, Environmental