An Approach to model the strength of coal pillars

Bertuzzi, Robert; Douglas, Kurt; Mostyn, Garry

doi:10.1016/j.ijrmms.2016.09.003

Cited by 49 publications

(23 citation statements)

References 14 publications

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“…where h is the mining height, m; c 1 and c 2 are related parameters of roof lithological characters, as shown in Table 2. 22 According to formula (5) and the types of immediate roof, the height of the caving zone was calculated to be 13.5 m. Then, the caving zone of the small abandoned mines could be obtained by the angle and height of caving zone.…”

Section: Calculation Of Caving Zonementioning

confidence: 99%

Control for the large section roadway under small abandoned mines in the same coal seam by secondary support

Tai

Xia

Liu

et al. 2020

Energy Science & Engineering

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Section: Calculation Of Caving Zonementioning

confidence: 99%

Control for the large section roadway under small abandoned mines in the same coal seam by secondary support

Tai

Xia

Liu

et al. 2020

Energy Science & Engineering

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“…Researchers have found various results that are favorable for understanding what the coal pillar generates, including theoretical analysis, field investigations and empirical derivation (Singh et al, 2011;Wilson, 1983;Yu et al, 2016). However, most of these studies focused on the stability, strength, loading state, design method and failure behavior of coal pillars (Ashok Jaiswal and Shrivastva, 2009;Bertuzzi et al, 2016). These findings mainly focus on roadway driving along the gob, room and pillar mining, roof movement during depillaring and other areas (Cheng et al, 2010;Jayanthu et al, 2004;Sherizadeh and Kulatilake, 2016;Wang et al, 2013).…”

Section: Numerical Model Establishmentmentioning

confidence: 99%

Numerical insights into stress redistribution in protected seam mining with coal pillars and an application to methane control

He¹

2019

Acta Geodynamica Et Geomaterialia

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This paper identifies the stress redistribution of protected seams under the influence of coal pillars and a divisional management strategy for methane control. A coal pillar that is reserved in the protective seam greatly affects the abutment stress, the O-shaped circle's evolution and the stress distribution. The strain-soften model was conducted using FLAC3D numerical analysis software to investigate the stress redistribution in the protected seam mining process. The results show that the abutment stress reaches a maximum value of 1.25 times the original stress when a protected seam coal face lies in the center of the coal pillar's affected zone. The O-shaped circle is divided into two parts by the coal pillar, and its developmental width is closely associated with the protected seam mining stage and the developmental height of the "three zones", especially the fractured zone. The stress redistribution of protected seam is rarely affected by the coal pillar when the distance is greater than 26 m. Both the total increased stress belt of the coal pillar affected zone and the total decreased stress belt of the other zones along the vertical direction significantly influence the methane migration. We propose a divisional management strategy that supplies a theoretical basis and technical guidance for methane control.

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“…Meng Wang [14] studied the vertical stress distribution characteristics of deep coal pillar of gob-side entry by FLAC3D simulation and discussed the instability failure mechanism. Robert Bertuzzi et al [15] analyzed the maximum principal stress distribution law of surrounding rock under different coal pillar widths by numerical simulation according to the data in Africa, the USA, and India; they established a new method for estimating the strength of coal pillar. Jiang L [16] studied the distribution characteristics of side abutment pressure on the deep mining face and the change rule of the vertical stress of surrounding rock of gob-side entry under different coal pillar widths by numerical simulation; this work also proposes the optimum design method of coal pillar width.…”

Section: State Of the Artmentioning

confidence: 99%

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Qiang

Wang

et al. 2019

Teh. vjesn.

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The optimum design of deep-coal pillar width at the gob-side entry is the key to control surrounding rocks. Existing studies on this issue are based on the distribution law of mining abutment pressure without considering the principal stress difference distribution, which is related to the shear failure of surrounding rock. This study aimed to optimize the design of deep-coal pillar width at gob-side entry based on the distribution law of the principal stress difference. With FLAC 3D numerical simulation, the distribution characteristics of principal stress difference in the side mining stress field of the deep mining face and the distribution laws of the principal stress difference of the surrounding rock at the gob-side entry under different coal pillar width were explored. According to the distribution characteristics of the principal stress difference, the coal and rock mass on the goaf side in the deep mining face could be divided into three zones, i.e., decreasing, increasing and stable zones. Results show that the principal stress differences of the deep surrounding rock on the roof, floor, and coal wall rib at the gob-side entry present a single-peak curve distribution under different coal pillar width. However, the principal stress difference of the surrounding rock on the coal pillar rib displays a single-peak curve when the coal pillar width is less than or equal to 8 m, but a double-peak curve appears when the coal pillar width is greater than 8 m. The peak value of the shallow surrounding rock is obviously smaller than that of the deep surrounding rock. The width of the coal pillar of the gob-side entry in 11030-tunnel was optimized according to the theoretical calculation. This work provides a novel idea and method for the arrangement of deep coal pillars of gob-side entry.

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An Approach to model the strength of coal pillars

Cited by 49 publications

References 14 publications

Control for the large section roadway under small abandoned mines in the same coal seam by secondary support

Control for the large section roadway under small abandoned mines in the same coal seam by secondary support

Numerical insights into stress redistribution in protected seam mining with coal pillars and an application to methane control

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

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