File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1016/j.tust.2018.11.012
- Scopus: eid_2-s2.0-85057858270
- WOS: WOS:000457506700043
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Unloading-induced failure of brittle rock and implications for excavation-induced strain burst
Title | Unloading-induced failure of brittle rock and implications for excavation-induced strain burst |
---|---|
Authors | |
Keywords | Unloading-induced failure Brittle rock Discrete element model Strain burst |
Issue Date | 2019 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/tust |
Citation | Tunnelling and Underground Space Technology, 2019, v. 84, p. 495-506 How to Cite? |
Abstract | Understanding the unloading-induced failure characteristics of brittle rock is essential for predicting excavation-induced strain burst. We conduct both the laboratory experiments and discrete element simulations to investigate the deformation, failure pattern, and strain energy evolution of the Bukit Timah granite. The laboratory tests with radial unloading show that the radial strain mainly contributes to the change of volumetric strain in the unloading process. The numerical tests with the flat-jointed contact model reproduce the Hoke-Brown failure envelope of the rock, and simulate the unloading-induced rock failure under different combinations of initial confining pressure and unloading rate. The evolutions of strain energy release and failure pattern show that higher unloading rate likely induces violent failure, in terms of greater lateral expansion and more ejected fragments. The micromechanical analyses on the particle velocity and tensile contact force reveal that the non-uniform rock deformation concentrates at lateral surfaces and results in strain burst with fragment ejection. The Hoek-Brown failure criterion well predicts the confining pressure at failure when the rock is laterally unloaded at lower unloading rate, but likely overestimates the stress level at higher unloading rate. |
Persistent Identifier | http://hdl.handle.net/10722/274889 |
ISSN | 2023 Impact Factor: 6.7 2023 SCImago Journal Rankings: 2.174 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Duan, K | - |
dc.contributor.author | Ji, Y | - |
dc.contributor.author | Wu, W | - |
dc.contributor.author | Kwok, CY | - |
dc.date.accessioned | 2019-09-10T02:30:59Z | - |
dc.date.available | 2019-09-10T02:30:59Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Tunnelling and Underground Space Technology, 2019, v. 84, p. 495-506 | - |
dc.identifier.issn | 0886-7798 | - |
dc.identifier.uri | http://hdl.handle.net/10722/274889 | - |
dc.description.abstract | Understanding the unloading-induced failure characteristics of brittle rock is essential for predicting excavation-induced strain burst. We conduct both the laboratory experiments and discrete element simulations to investigate the deformation, failure pattern, and strain energy evolution of the Bukit Timah granite. The laboratory tests with radial unloading show that the radial strain mainly contributes to the change of volumetric strain in the unloading process. The numerical tests with the flat-jointed contact model reproduce the Hoke-Brown failure envelope of the rock, and simulate the unloading-induced rock failure under different combinations of initial confining pressure and unloading rate. The evolutions of strain energy release and failure pattern show that higher unloading rate likely induces violent failure, in terms of greater lateral expansion and more ejected fragments. The micromechanical analyses on the particle velocity and tensile contact force reveal that the non-uniform rock deformation concentrates at lateral surfaces and results in strain burst with fragment ejection. The Hoek-Brown failure criterion well predicts the confining pressure at failure when the rock is laterally unloaded at lower unloading rate, but likely overestimates the stress level at higher unloading rate. | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/tust | - |
dc.relation.ispartof | Tunnelling and Underground Space Technology | - |
dc.subject | Unloading-induced failure | - |
dc.subject | Brittle rock | - |
dc.subject | Discrete element model | - |
dc.subject | Strain burst | - |
dc.title | Unloading-induced failure of brittle rock and implications for excavation-induced strain burst | - |
dc.type | Article | - |
dc.identifier.email | Kwok, CY: fkwok8@hku.hk | - |
dc.identifier.authority | Kwok, CY=rp01344 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.tust.2018.11.012 | - |
dc.identifier.scopus | eid_2-s2.0-85057858270 | - |
dc.identifier.hkuros | 304501 | - |
dc.identifier.volume | 84 | - |
dc.identifier.spage | 495 | - |
dc.identifier.epage | 506 | - |
dc.identifier.isi | WOS:000457506700043 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0886-7798 | - |