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

Title:

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

Creator:

He , Fulian, Zhu , Ruojun, and Zhu , Hengzhong

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b3d73121-debe-4387-acb6-30088b98bf28
uuid:b3d73121-debe-4387-acb6-30088b98bf28
doi:10.13168/AGG.2019.0014

Subject:

protected seam mining, coal pillar, stress redistribution, methane control, and divisional management strategy

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

169-182

Source:

Acta geodynamica et geomaterialia : | 2019 Volume:16 | Number:2 (194)

Harvested from:

CDK

Metadata only:

false