@Article{cmes.2021.014665,
AUTHOR = {Chunlei Zhang, Y. P. Chugh, Ruimin Feng, Yong Zhang, Wei Shen, Jingke Wu, Yushun Yang},
TITLE = {A Numerical Investigation of the Stress Relief Zones Around a Longwall Face in the Lower Seam for Gas Drainage Considerations},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {127},
YEAR = {2021},
NUMBER = {1},
PAGES = {135--157},
URL = {http://www.techscience.com/CMES/v127n1/41945},
ISSN = {1526-1506},
ABSTRACT = {Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal and
gas outburst risk-plays an important role not only in decreasing the stress field in the surrounding rock mass but also
in increasing the gas desorption capacity and gas flow permeability in the protected coal seam (PTCS). The PVCS
is mined to guarantee the safe mining of the PTCS. This study has numerically evaluated the stress redistribution
effects using FLAC3D model for a longwall face in Shanxi Province. The effects of mining depth, mining height and
inter-burden rock mass properties were evaluated using the stress relief angle and stress relief coefficient. Vertical
stress distribution, stress relief angle and stress relief coefficient in the PTCS were analyzed as the face advanced
in the PVCS. The results showed that the stress relief achieved in different locations of the PTCS varied as the face
advanced. Sensitivity analyses on the pertinent variables indicate that the stress relief in the PTCS is affected most
by the mining depth followed by the inter-burden lithology and the mining height. Furthermore, the elastic moduli
of different layers within the inter-burden rock mass are more important than their uniaxial compressive strength
(UCS) and Poisson’s ratio. These observations can guide gas drainage borehole design to minimize the accidents
of coal and gas outbursts.},
DOI = {10.32604/cmes.2021.014665}
}