Application of an Improved Flow-Stress-Damage Model to the Criticality Assessment of Water Inrush in a Mine: a Case Study |
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| Authors: | H Q Zhang Y N He C A Tang Bashir Ahmad L J Han |
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| Institution: | (1) State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Architecture and Civil Engineering, China University of Mining and Technology, 221008 Xuzhou City, Jiangsu Province, People’s Republic of China;(2) Center for Rock Instability and Seismicity Research, Dalian University of Technology, 116622 Dalian City, Liaoning Province, People’s Republic of China;(3) Department of Geology, Utah State University, Logan, UT 84322-4505, USA |
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| Abstract: | This paper presents a case study of water inrush on a mine working face from roof strata. The flow-rock failure process analysis
(F-RFPA2D) code with an improved flow-stress-damage (FSD) model was adopted to perform the failure and coupling analysis. The improved
FSD model was used to represent the permeability variation at the four stages (elastic, damaged, cracked, and crack closure)
of the rock failure process. The fracture initiation, propagation, and coalescence in the stressed strata and the seepage
field evolution in the stress field are represented visually during the whole process of water inrush. The failure zone with
high permeability induced by mining disturbance becomes the water-conducting zone after full excavation of the coal seam.
The height of the water-conducting zone obtained in this study is in reasonable accordance with that predicted by an empirical
formula. It is definitely clarified that the water inrush from the roof strata is induced by the failure zone full of vertical
coalesced mine fractures. It is unlikely that roof accidents resulting in water inrush would occur if the water-conducting
zone does not grow upwards into the aquifer. The main task for mine extraction under a confined aquifer is to locate the aquifer
and find the maximum height of the water-conducting zone, which is very important for mine construction and support design. |
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