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Article: A coupled flow-stress-damage model for groundwater outbursts from an underlying aquifer into mining excavations

TitleA coupled flow-stress-damage model for groundwater outbursts from an underlying aquifer into mining excavations
Authors
KeywordsFlow-Stress-Damage Model
Groundwater Outbursts
Permeability Evolution
Rock Failure
Underground Coal Mining
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmms
Citation
International Journal Of Rock Mechanics And Mining Sciences, 2007, v. 44 n. 1, p. 87-97 How to Cite?
AbstractUncontrolled groundwater outbursts from underlying limestone aquifers into mining excavations present a significant safety challenge for underground coal mining in China. Although these mining hazards have been known for decades, the mechanism for groundwater outbursts remains elusive. A fully coupled flow-stress-damage model is presented to simulate the progressive development of fractures and the associated groundwater flow under incremental loading conditions resulting from mining processes. The model is based on classical theories of porous media flow and damage mechanics and importantly links changes in permeability with the accumulation of damage in following the complete stress-strain process. This coupled flow-stress-damage model is applied to examine the influence of mining advance on the initiation, extension, and evolution of an outburst conduit as it develops adjacent to the mine panel. Fractures are shown to initiate both from the wings of the excavation in shear, and from the center of the floor span, in extension. The growth of the extensile fractures is stunted by the presence of a high stress abutment, but the wing fractures extend, with one fracture becoming dominant. As the dominant fracture develops into the underlying over-pressured zone, water pressures transmitted along the now-open conduit reduce effective stresses and develop rapid heave displacements within the floor. The result is a groundwater outburst. The modeling is tuned to the results of laboratory experiments and follows the evolution of a viable outburst path. Observations corroborate with field measurements of permeability pre- and post-mining and are strong indicators of the veracity of the approach. © 2006 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150376
ISSN
2015 Impact Factor: 2.01
2015 SCImago Journal Rankings: 2.134
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYang, THen_US
dc.contributor.authorLiu, Jen_US
dc.contributor.authorZhu, WCen_US
dc.contributor.authorElsworth, Den_US
dc.contributor.authorTham, LGen_US
dc.contributor.authorTang, CAen_US
dc.date.accessioned2012-06-26T06:03:59Z-
dc.date.available2012-06-26T06:03:59Z-
dc.date.issued2007en_US
dc.identifier.citationInternational Journal Of Rock Mechanics And Mining Sciences, 2007, v. 44 n. 1, p. 87-97en_US
dc.identifier.issn1365-1609en_US
dc.identifier.urihttp://hdl.handle.net/10722/150376-
dc.description.abstractUncontrolled groundwater outbursts from underlying limestone aquifers into mining excavations present a significant safety challenge for underground coal mining in China. Although these mining hazards have been known for decades, the mechanism for groundwater outbursts remains elusive. A fully coupled flow-stress-damage model is presented to simulate the progressive development of fractures and the associated groundwater flow under incremental loading conditions resulting from mining processes. The model is based on classical theories of porous media flow and damage mechanics and importantly links changes in permeability with the accumulation of damage in following the complete stress-strain process. This coupled flow-stress-damage model is applied to examine the influence of mining advance on the initiation, extension, and evolution of an outburst conduit as it develops adjacent to the mine panel. Fractures are shown to initiate both from the wings of the excavation in shear, and from the center of the floor span, in extension. The growth of the extensile fractures is stunted by the presence of a high stress abutment, but the wing fractures extend, with one fracture becoming dominant. As the dominant fracture develops into the underlying over-pressured zone, water pressures transmitted along the now-open conduit reduce effective stresses and develop rapid heave displacements within the floor. The result is a groundwater outburst. The modeling is tuned to the results of laboratory experiments and follows the evolution of a viable outburst path. Observations corroborate with field measurements of permeability pre- and post-mining and are strong indicators of the veracity of the approach. © 2006 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmmsen_US
dc.relation.ispartofInternational Journal of Rock Mechanics and Mining Sciencesen_US
dc.subjectFlow-Stress-Damage Modelen_US
dc.subjectGroundwater Outburstsen_US
dc.subjectPermeability Evolutionen_US
dc.subjectRock Failureen_US
dc.subjectUnderground Coal Miningen_US
dc.titleA coupled flow-stress-damage model for groundwater outbursts from an underlying aquifer into mining excavationsen_US
dc.typeArticleen_US
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_US
dc.identifier.authorityTham, LG=rp00176en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.ijrmms.2006.04.012en_US
dc.identifier.scopuseid_2-s2.0-33750362881en_US
dc.identifier.hkuros212066-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33750362881&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume44en_US
dc.identifier.issue1en_US
dc.identifier.spage87en_US
dc.identifier.epage97en_US
dc.identifier.isiWOS:000242318400006-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYang, TH=7404656308en_US
dc.identifier.scopusauthoridLiu, J=8602049000en_US
dc.identifier.scopusauthoridZhu, WC=7404232063en_US
dc.identifier.scopusauthoridElsworth, D=7005281835en_US
dc.identifier.scopusauthoridTham, LG=7006213628en_US
dc.identifier.scopusauthoridTang, CA=20436860800en_US

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