Influence of the stress state in a coal bump-prone deep coalbed: A case study

Aguado, María Belarmina Díaz; González, Cristina Rodríguez

doi:10.1016/j.ijrmms.2008.07.005

Cited by 47 publications

(14 citation statements)

References 20 publications

(22 reference statements)

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“…Lawson et al (2016) analyzed 306 coal records from the Pennsylvania State coal sample database, and observed that both inherent susceptibility and appropriate stress conditions are necessary to facilitate a dynamic failure. Aguado and González (2009) conducted studies in tow mines and observed that sublevel caving is one of the methods primarily influencing the stress state, thus the condition of sublevel caving is an extremely important parameter to prevent disaster in mines. Zhang et al (2016) considered that if the width of the isolated coal pillar is not sufficiently large, the shallow coal seam would be damaged at first, and, subsequently, the high abutment pressure would be transferred to the deep coal seam that might cause an overall burst-instability accident.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and charge signal characteristics in coal material failure under different loading paths

Ding

Xiao

et al. 2019

Int J Coal Sci Technol

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Rock burst is a catastrophic dynamic disaster caused by sudden failure and instability of coal, loading paths play an important role in the failure of coal, the coal failure process is associated with charge exception information. Hence, violent coal failure mechanics and time-frequency domain distribution of charge signal such as rock burst under different loading paths should be studied in-depth. In this paper, grade and cyclic loading test were carried out for coal with impact tendency samples produced by blocks cored from 800 depth in Xiaoqing coal mine of the Tiefa coal group in northeast China. Theory discussion was carried out for the result of stress and strain, frequency-spectra analysis was conducted for the wavelet charge data, figures showing the evolution mechanism of mechanical properties and the relationship of timefrequency domain amplitude of charge signals in coal with different loading paths and stage were obtained. The failure process and characteristics of coal under different loading paths were summarized. It found that the loading path changed the manner of energy accelerate-release, there were more plastic strain generation in coal under cyclic loading than that under grade loading, the former was more likely to cause greater damage and failure, then the strength of coal under cyclic loading is generally lower than that under grade loading, an energy conversion mechanical model of stress, damage and deformation was developed and explained the effect of the loading path. Charge signal was primarily distributed in the strengthening and peak stages, where there was a high amplitude pulse at each stress drop. The charge pulse was a type of low frequency signal with a primary frequency distribution range of 1-100 Hz. Discussion on the charge generating mechanism from the perspective of friction slip, it demonstrated that the charge obtained during the coal failure process directly to stress loaded on and damage, the result verified it better. We propose that the research results in this study could be efficiently applied to daily mining activities, to provide an early warning and effectively avoid rock burst disaster.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and charge signal characteristics in coal material failure under different loading paths

Ding

Xiao

et al. 2019

Int J Coal Sci Technol

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“…On the other hand, the failure process of brittle rock generally releases a lot of energy and leads to dynamic disasters in rock engineering. For instance, the failure of brittle rock in deep underground excavation projects regularly triggers rockbursts [11,12], and the mining process in deep coal mines with hard surrounding rock might induce coal bumps [13,14]. e research on the rock brittleness has significance in rock engineering.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bedding Angle and Confining Pressure on the Brittleness of Geomaterials: A Case Study on Slate

Hao

Yang

Shao-hua

et al. 2019

Advances in Materials Science and Engineering

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Brittleness is one of the most significant properties of geomaterials. However, very few studies have been conducted on factors influencing the rock brittleness indices. In this paper, conventional triaxial compression tests were carried out to investigate the effects of confining pressure and bedding angle on the brittleness of slate. From the perspective of energy, brittleness is an index that could reflect the release rate of energy that accumulated in the slate under the effect of external energy after reaching peak strength. Therefore, a new brittleness index of slate based on postpeak energy release is proposed herein. The applicability of this index is illustrated by comparing with other five existing brittleness indices. The following results can be obtained. (1) The confining pressure exerts a great influence on the brittleness of slate. With the increase of confining pressure, the brittleness of slate decreases significantly. The dispersion of brittleness values of slate declines with increasing confining pressure. (2) There is a parabolic relationship between slate brittleness and bedding angle. As bedding angle increases, the brittleness is intensified and reaches its maximum at a bedding angle of about 45° and then decreases gradually. (3) In contrast to the previous indices, the brittleness index proposed in this paper can describe the whole process of the postpeak stage through an index of the energy release, which makes this measure more suitable for rock that has the characteristics of step-drop or bench-drop at the postpeak stage.

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“…Production practice has proved that rock bursts and microseism easily occur when mining in the vicinity of a fault (Alber et al, 2009;Chen et al, 2012;Cianciara et al, 2008;Aguado et al, 2009;Gaviglio, 1985;Cao et al, 2009). In China, it is found that the stress distribution of the original rock near a fault and the distribution of abutment pressure significantly vary, according to rock burst hazards of several mining areas and rock pressure monitoring…”

Section: Introductionmentioning

confidence: 99%

Study on the law mining stress evolution and fault activation under the influence of normal fault

Wu¹

2017

Acta Geodynamica Et Geomaterialia

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Using the FLAC 3D numerical simulation method, the characteristics of mining stress evolution, fault activation patterns, and fault energy evolution characteristics are simulated and analyzed in the process of the footwall and hanging wall working face heading to a normal fault. The study shows that the fault cut off the mining stress propagation of overlying strata, and the stress blocking effect due to the fault is evident. When working faces head towards a fault, the abutment pressure and the vertical stress of the surrounding rock increase first and subsequently decrease. The abutment pressure of the coal wall and fault is highest when the distances to the fault are 40 m and 30 m for the footwall and hanging wall working faces, respectively. Moreover, the hanging wall mining stress is higher than the footwall mining stress. Fault activation in high-located strata precedes that in low-located strata when working faces head towards the normal fault. Energy is gradually accumulated before unstable fault events take place because of mining, and fault instability quickly releases a lot of energy. The mining stress concentration and fault activation due to faults easily result in rock bursts and mine seismicity. ARTICLE INFO

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Influence of the stress state in a coal bump-prone deep coalbed: A case study

Cited by 47 publications

References 20 publications

Mechanical properties and charge signal characteristics in coal material failure under different loading paths

Mechanical properties and charge signal characteristics in coal material failure under different loading paths

Effect of Bedding Angle and Confining Pressure on the Brittleness of Geomaterials: A Case Study on Slate

Study on the law mining stress evolution and fault activation under the influence of normal fault

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