Roof stability in deep rock tunnels
dc.contributor.author | Park, Dowon | |
dc.date.accessioned | 2024-08-30T18:55:24Z | |
dc.date.available | 2024-08-30T18:55:24Z | |
dc.date.issued | 2019-11-06 | |
dc.identifier.citation | Int. Jrnl. Rock Mech. Mining Sci., 124, 104139, 1-12 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/194360 | en |
dc.description | This study indicates how to analyze stability of a tunnel roof using limit analysis with numerical optimization of arch formation (2D approach). | en_US |
dc.description.abstract | A method is presented addressing quantitative assessment of tunnel roof stability, based on the kinematic approach of limit analysis. Long tunnels with both rectangular (flat-ceiling) and circular cross-sections are considered. The rock is governed by the Hoek-Brown strength envelope and the normality flow rule, and it is assumed to provide enough ductility at failure, making plasticity theorems applicable. A failing block in the collapse mechanism is separated from the stationary rock by a deformation band with a large gradient of velocity across its width. The shape of the block in the critical mechanism is found from the requirement of the mechanism’s kinematic admissibility and an optimization procedure consistent with respective measures of stability. The stability number and the supporting pressure needed for tunnel stability are calculated first. Although less commonly used in rock engineering, a procedure is developed for estimating the factor of safety, defined as the ratio of the rock shear strength determined from the Hoek-Brown criterion to the demand on the strength. Curiously, for flat-ceiling tunnels, such definition of the factor of safety yields results equivalent to the ratio of a dimensionless group dependent on the uniaxial compressive strength and the size of the tunnel to the stability number. Such an equivalency does not hold for tunnels with ceilings of finite curvature. Not surprisingly, all measures of tunnel roof stability are strongly dependent on the Geological Strength Index that describes the quality of the rock. | en_US |
dc.description.sponsorship | NSF Grant No. CMMI-1901582 | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Elsevier | en_US |
dc.relation.ispartofseries | - | en_US |
dc.subject | NSF-1901582 | en_US |
dc.title | Roof stability in deep rock tunnels | en_US |
dc.title.alternative | none | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Civil and Environmental Engineering | |
dc.subject.hlbtoplevel | Engineering | |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Civil and Environmental Engineering, Department of | en_US |
dc.contributor.affiliationum | Civil & Environmental Engineering | en_US |
dc.contributor.affiliationother | none | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/194360/1/Park&Michalowski_IJRMMS_2019.pdf | |
dc.identifier.doi | https://dx.doi.org/10.7302/23708 | |
dc.identifier.source | International Journal of Rock Mechanics and Mining Sciences | en_US |
dc.description.mapping | -1 | en_US |
dc.identifier.orcid | 0000 0002 9557 4802 | en_US |
dc.description.filedescription | Description of Park&Michalowski_IJRMMS_2019.pdf : A study of tunnel roof stability using limit analysis and numerical optimization of arch formation (2D approach). | |
dc.description.depositor | SELF | en_US |
dc.working.doi | 10.7302/23708 | en_US |
dc.owningcollname | Civil & Environmental Engineering (CEE) |
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