Study on electromagnetic radiation forecast for rock burst with hard roof

Du, Benni; Yao, Jianfeng; He, Fei

doi:10.1201/9780203883204.ch151

Cited by 1 publication

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“…e strain energy densities and strain energies of the roofs above the coal seam and goaf can be obtained by separately substituting terms M 1 (x) and M 2 (x) into equations (11) and (12).…”

Section: Calculation Of the Roof Bending Deformation Energymentioning

confidence: 99%

“…Fang et al investigated rock burst event mechanisms using several methods including field analysis, indoor testing, and numerical simulation [9]. Yao et al used theoretical analyses and field measurements to prove that sudden hard roof collapses result from unstable development of coal mass cracks, which can cause burst events [10][11][12]. Wang et al found the mechanism that induces rock bursts can be divided into two stages: the accumulation of strain energy prior to HTS failure and the release of strain energy because of the coupling effect of HTS failure and fault slipping [13].…”

Section: Introductionmentioning

confidence: 99%

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Study on Rock Burst Event Disaster and Prevention Mechanisms of Hard Roof

Zhou

Liu

Zhang

et al. 2019

Advances in Civil Engineering

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Coal mining under hard roofs is jeopardized by rock burst-induced hazards. In this paper, mechanisms of hard roof rock burst events and key techniques for their prevention are analyzed from the standpoint of energy evolution within geological conditions typical of the hard roofs found in Chinese coal mines. Equations used to calculate the total strain energy densities of the coal-rock mass and hard roof working face are derived. Moreover, several failure-causing energy evolution rules are analyzed under various conditions. Various rock roof and coal mass thicknesses and strengths are considered, and a method of preventing hard roof rock burst events is proposed. The results obtained show that rock burst events can be facilitated by high stress concentrations, significant accumulation of strain energy in the coal-rock mass, and rapid energy release during roof breakage. The above conditions are subdivided into two classes: energy accumulation and energy release. The total strain energies of the coal mass and working faces in the roof are positively correlated with the roof thickness, roof strength, and coal mass strength. The coal mass strength primarily influences the overall accumulation of energy in the working face, and it also has the largest effect on the total energy release (i.e., the earthquake magnitude).

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“…e strain energy densities and strain energies of the roofs above the coal seam and goaf can be obtained by separately substituting terms M 1 (x) and M 2 (x) into equations (11) and (12).…”

Section: Calculation Of the Roof Bending Deformation Energymentioning

confidence: 99%