Rockburst mechanism in soft coal seam within deep coal mines
TLDR
In this paper, the authors established an energy integral model for the rockburst-inducing area and a friction work calculation model for a plastic area and showed that if the remaining energy after the coal seam is broken in the rock-burstinducing area is greater than the friction work required for the coal to burst out, then a rockburst accident will occur.Abstract:
A number of rockburst accidents occurring in soft coal seams have shown that the rockburst mechanism involved in soft coal seams is significantly different from that involved in hard coal seams. Therefore, the method used to evaluate rockburst in hard coal seams is not applicable to soft coal seams. This paper established an energy integral model for the rockburst-inducing area and a friction work calculation model for the plastic area. If the remaining energy after the coal seam is broken in the rockburst-inducing area is greater than the friction work required for the coal to burst out, then a rockburst accident will occur. Mechanisms of “quaking without bursting” and “quaking and bursting” are clarified for soft coal seams and corresponding control measures are proposed as the optimization of roadway layouts and use of “three strong systems” (strong de-stressing, strong supporting, and strong monitoring).read more
Citations
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Machine learning methods for rockburst prediction-state-of-the-art review
TL;DR: A state-of-the-art review of various applications of machine learning methods for the prediction of rockburst potential and the limitations of such methods are highlighted.
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Development of ensemble learning models to evaluate the strength of coal-grout materials
TL;DR: In this paper, a robust intelligent model for predicting uniaxial compressive strength (UCS) of coal-grouted coal grout composites was proposed, and the results showed that the chemical grout composite has higher short-term strength, while the cement grout can achieve more stable strength in the long term.
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Dynamic Analysis of the Rock Burst Potential of a Longwall Panel Intersecting with a Fault
Lishuai Jiang,Lishuai Jiang,Peng Kong,Peipeng Zhang,Jiaming Shu,Qingbiao Wang,Lianjun Chen,Quanlin Wu +7 more
TL;DR: In this paper, a longwall panel intersecting with a fault is introduced, as well as field microseismic (MS) monitoring, and both static and dynamic numerical analyses are conducted to investigate the fault parameters' effects on the behaviors of the fault.
Directional hydraulic fracturing to control hard-roof rockburst in coal mines
TL;DR: In this paper, the authors investigated the effect of hydraulic fracturing on the main roof of Jisan coal mine in China and showed that the energy efficiency of hard roof was significantly reduced after the hydraulic fracturing.
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Mechanism and risk assessment of overall-instability-induced rockbursts in deep island longwall panels
TL;DR: Wang et al. as mentioned in this paper investigated the mechanism of the newly defined overall instability-induced (OII) rockburst by means of stress and microseismic monitoring, and then proposed a straightforward risk assessment method for OII rockbursts based on the actual bearing index in an attempt to provide guidelines for making engineering judgement.
References
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Journal ArticleDOI
A study of brittle rock fracture in laboratory compression experiments
W.R. Wawersik,Charles Fairhurst +1 more
TL;DR: In this article, the authors developed test procedures to control brittle rock failure in uniaxial and multi-axial compression experiments using a stiff testing machine and obtained complete stress-strain curves so obtained revealed two distinct classes of post-failure behavior.
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Bursting liability indices of coal
TL;DR: In this paper, several indices have been proposed and their numerical values found by experiment in order to classify the potential liability of coal seams to create rock-burst hazards, namely the strain energy storage index (W ET ), the Bursting Efficiency Ratio (η), and the Rheologic Ratio (ϑ).
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The failure of rock
TL;DR: In this paper, an analysis of the energy changes associated with the extension of Griffith cracks in tension and compression is made, which shows that the non-elastic behaviour can be described by a curved Griffith locus in the strain-stress plane.
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Rock Burst Intensity Classification Based on the Radiated Energy with Damage Intensity at Jinping II Hydropower Station, China
TL;DR: Based on the radiated energy of 133 rock bursts monitored by a microseismic technique at the Jinping II hydropower station, in Sichuan province, China, this article analyzed the advantages and disadvantages of qualitative classification methods for the rock burst intensity.
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Research progress of monitoring, forecasting, and prevention of rockburst in underground coal mining in China
TL;DR: Based on the laboratory test, field test, and theoretical analysis, this article proposed the principle of the rock burst induced by the combination of dynamic and static stresses and divided such rock burst into three types, including induced by primary dynamic stress, mainly induced by dynamic stress in low critical stress state.