Physical Characteristics of Section Coal and Rock Pillars Under Roof Shock Disturbances From Goaf

Su, Ronghua; Shen, Hongshuang

doi:10.3389/fphy.2020.00223

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…Qi [20] et al comprehensively adopted theoretical analysis and numerical simulation to reveal the failure mechanism of surrounding rock under intense mining disturbance of thick coal seam and verified it through field measurement results. Su [21] et al believe that roof impact disturbance in goaf is usually one of the important factors causing the instability of coal pillar and rock pillar, and the impact of impact frequency on the vertical deformation and plastic zone occupancy of coal pillar is more obvious than the impact of impact intensity. In summary, previous studies mainly focused on the evolution of the stress field and energy field under the influence of external mining disturbance on a single working face, and few studies on the influence of mining mutual disturbance on multiple mining faces.…”

Section: Introductionmentioning

confidence: 99%

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Bai

et al. 2023

Applied Sciences

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The rock burst induced by the mutual disturbance of mining and excavation is significantly influenced by high static load stress and external dynamic load disturbance. In this paper, the evolution characteristics and progressive damage mechanism of surrounding rock in the process of mutual disturbance of mining and excavation are systematically studied. The results show that the evolution of surrounding rock stress can be roughly divided into three stages: rapid rise in the early stage, continuous rise and step-like decline in the middle stage, and slow rise in the late stage. In the process of parallel mining, the overlying rock movement above the goaf shows the sequence of horizontal penetration of tiny fissures—fracture intensification transition to stratification—non-coordinated caving of middle–low overlying rock—obvious horizontal cracks in the upper key layer. Only under the quasi-static loading mining action does the upper key layer not reach the breaking condition. The wave side of the heading face which is close to the focal point is affected by the dynamic load disturbance, the acceleration duration is short, and the attenuation is relatively fast, so it is the area prone to the earliest impact failure in the face of mining disturbance. The conclusion is helpful to deepen the understanding of the coal burst mechanism of mutual disturbance of mining and excavation.

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Section: Introductionmentioning

confidence: 99%

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Bai

et al. 2023

Applied Sciences

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show abstract

Experiment on acoustic emission response and damage evolution characteristics of polymer-modified cemented paste backfill under uniaxial compression

Ouyang

Huang

Zhou

et al. 2023

Int J Miner Metall Mater

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Study on natural frequency response characteristics of coal vibration excited by simple harmonic wave

Wen

Zhang

Wei

et al. 2022

Sci Rep

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The natural frequency of coal is one of the important technical parameters for the application of the permeability enhancement technology of coal and rock forced vibration. Aiming at exploring the dominant frequency of the permeability enhancement technology of coal vibration excited by vibration wave, the model of coal vibration excited by simple harmonic wave (SHW) was constructed. Furthermore, considering the three main control parameters, i.e., excitation force, coal sample size and mechanical parameters, the response characteristics of coal vibration excited by SHW were simulated and calculated. The calculation results demonstrate that when the frequency of excitation force equals the natural frequency of coal, the vibration occurs and the peak values of response parameters all increase significantly. The peak acceleration response of coal increases with the increase of excitation force, whereas it decreases with the increase of coal size. Under the same SHW excitation force, the mechanical parameters of coal determine the vibration response characteristics of coal, and the natural frequency of coal is proportional to the elastic modulus. Finally, the variation law of natural frequency response characteristics of coal vibration excited by SHW was verified by the response experiment on coal vibration under SHW excitation and related test results. The research results can serve as a theoretical basis for the application of the permeability enhancement technology of coal vibration excited by vibration wave.

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Physical Characteristics of Section Coal and Rock Pillars Under Roof Shock Disturbances From Goaf

Cited by 3 publications

References 39 publications

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Experiment on acoustic emission response and damage evolution characteristics of polymer-modified cemented paste backfill under uniaxial compression

Study on natural frequency response characteristics of coal vibration excited by simple harmonic wave

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