Experimental study of rock burst in coal samples under overstress and true-triaxial unloading through passive velocity tomography

Zhu, Guang-an; Li, Dou; Wang, Changbin; Ding, Ziwei; Feng, Ze-jie; Xue, Fei

doi:10.1016/j.ssci.2019.04.012

Cited by 44 publications

(19 citation statements)

References 20 publications

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“…The results showed that coal and sandstone’s strength was the highest, followed by coal and mudstone. Zhu et al 22 conducted true triaxial experiments on coal samples under two loaded stress paths. It was concluded that coal samples were more prone to damage under the condition of triaxial unloading.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Meng

Yang

et al. 2021

ACS Omega

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In order to find briquette coal with mechanical characteristics close to those of raw coal samples, we conducted triaxial compression experiments on raw coal and briquette coal samples with different proportions of cement contents. The mechanical characteristics and acoustic emission (AE) characteristics of the coal samples in the triaxial compression process were analyzed in detail. The test results show that the evolution of deformation and strength characteristics of the briquette coal and raw coal samples follow certain common laws. The confining pressure can improve the mechanical properties of both types of coal samples: as the confining pressure continues to increases according to the set values, the elastic modulus, peak strain, and peak strength of both samples show an increasing linear trend. When the value of the confining pressure setting was the same, the compressive strength of the raw coal samples exceeded that of briquette ones, but the deformation and shape variations of the latter exceeded those of the former. When performing triaxial compression experiments on both kinds of coal samples, the AE amplitude and counts showed a close correlation with the stress evolution curves. When the confining pressure was set to 5 MPa, 20% cement content briquette coal was seen to be the closest to raw coal samples regarding mechanical and AE characteristics.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Meng

Yang

et al. 2021

ACS Omega

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“…e complex geological structures centered on faults not only influence the continuity of mine production, but also probably trigger some dynamic disasters such as fault-induced rockburst, which greatly threatens the safety production of coal mines [1,2]. e time-, frequency-, and energy-domain curves of a microseismic (MS) signal, as the concomitant signal during the deformation and fracture of coal-rock mass, can indirectly reflect the generation, propagation, and attenuation processes of the signal.…”

Section: Introductionmentioning

confidence: 99%

An Analysis Method for Time‐, Frequency‐, and Energy‐Domain Characteristics of Downhole Microseismic Signals and Its Application

Gao

Pan

Zhu

2021

Shock and Vibration

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Based on SOS microseismic (MS) monitoring system of a certain mine, time-, frequency-, and energy-domain characteristics of MS signals are analyzed by comprehensively applying one-dimensional discrete Fourier transform (DFT) and one-dimensional discrete wavelet transform (DWT). The technology is employed to explore MS signals from incident and transmitted waves on the fault plane. The research results show that, within the time domain, the transmitted waves are found to have the rapidly reducing velocity and a few wave crests; within the frequency domain, the fault plane presents a low-pass filtering effect on incident waves; within the energy domain, the fault generally shows the vibration-attenuating effect on MS signals. The analysis method is used for the No. 3307 working face of a certain mine to realize the prediction on a buried fault in the middle part of the working face, and it is validated to have a favorable effect.

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“…Gong et al improved the prediction accuracy of rock burst by adaptive-grid method and passive seismic tomography [13]. Zhu et al investigated the influence of overstress state on rockburst in deep underground coal mining and found that compared to triaxial loading, coal samples are more easy to deform and bring to failure under triaxial unloading [14]. For Dai et al, the rock physical and mechanical parameters of 36 near horizontal coal seams are collected and the prediction model of coal pillar width is constructed [15,16].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism and Control of Rock Burst of Coal Pillar under Complex Conditions

Lai

Fan

et al. 2020

Geofluids

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In order to explore the mechanism of coal pillar rock burst in the overlying coal body area, taking W1123 working face of Kuangou Coal Mine as the engineering background, the full mining stage of W1123 is simulated by FLAC3D. It is found that the high stress concentration area has appeared on both sides of the coal pillar when W1123 does not start mining. With the advance of the working face, the high stress concentration area forms X-shaped overlap. There is an obvious difference in the stress state between the coal pillar under the solid coal and the coal pillar under the gob in W1123. The concrete manifestation is that the vertical stress of the coal pillar below the solid coal is greater than the vertical stress of the coal pillar below the gob. The position of the obvious increase of the stress of the coal pillar in the lower part of the solid coal is ahead of the advancing position of the working face, and the position of the obvious increase of the stress of the lower coal pillar in the gob lags behind the advancing position of the working face. At the same time, in order to accurately reflect the true stress environment of coal pillars, the author conducted a physical similarity simulation experiment in the laboratory to study the local mining process of the W1123 working face, and it is found that under the condition of extremely thick and hard roof, the roof will be formed in the gob, the mechanical model of roof hinged structurer is constructed and analyzed, and the results show that the horizontal thrust of roof structure increases with the increase of rotation angle. With the development of mining activities, the self-stable state of the high stress balance in the coal pillar is easily broken by the impact energy formed by the sudden collapse of the key strata. Therefore, the rock burst of coal pillar in the overlying coal body area is the result of both static load and dynamic load. In view of the actual situation of the Kuangou Coal Mine, the treatment measures of rock burst are put forward from the point of view of the coal body and rock mass.

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Experimental study of rock burst in coal samples under overstress and true-triaxial unloading through passive velocity tomography

Cited by 44 publications

References 20 publications

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

An Analysis Method for Time‐, Frequency‐, and Energy‐Domain Characteristics of Downhole Microseismic Signals and Its Application

Study on the Mechanism and Control of Rock Burst of Coal Pillar under Complex Conditions

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