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Anisotropic behaviour of stratified rock masses in tunnelling

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dc.contributor.author Fortsakis, P en
dc.contributor.author Nikas, K en
dc.contributor.author Marinos, V en
dc.contributor.author Marinos, P en
dc.date.accessioned 2014-03-01T02:07:43Z
dc.date.available 2014-03-01T02:07:43Z
dc.date.issued 2012 en
dc.identifier.issn 00137952 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/29606
dc.subject Anisotropy en
dc.subject Convergence en
dc.subject Rock mass en
dc.subject Stratification en
dc.subject Tunnel en
dc.subject Tunnel behaviour en
dc.subject.other Convergence en
dc.subject.other Critical failures en
dc.subject.other Geomaterials en
dc.subject.other Isotropic materials en
dc.subject.other Rock mass en
dc.subject.other Rock mass elements en
dc.subject.other Rock mass properties en
dc.subject.other Rock mass structure en
dc.subject.other Separate element en
dc.subject.other Stratified rock mass en
dc.subject.other Surface conditions en
dc.subject.other Tunnel excavation en
dc.subject.other Tunnel sections en
dc.subject.other Anisotropy en
dc.subject.other Computer simulation en
dc.subject.other Engineering geology en
dc.subject.other Numerical analysis en
dc.subject.other Rocks en
dc.subject.other Thermal stratification en
dc.subject.other Tunneling (excavation) en
dc.subject.other Tunnels en
dc.subject.other Rock mechanics en
dc.subject.other anisotropy en
dc.subject.other convergence en
dc.subject.other discontinuity en
dc.subject.other failure mechanism en
dc.subject.other numerical model en
dc.subject.other rock mass response en
dc.subject.other stratification en
dc.subject.other tunneling en
dc.subject.other uncertainty analysis en
dc.title Anisotropic behaviour of stratified rock masses in tunnelling en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.enggeo.2012.05.001 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.enggeo.2012.05.001 en
heal.publicationDate 2012 en
heal.abstract This paper investigates tunnel excavation through stratified rock masses from the engineering geological behaviour to the rock mass properties quantification and finally to the study of tunnel response, based on numerical analyses results. Initially the spectrum of the engineering geological behaviour of stratified rock masses in tunnelling is delimited and the critical failure mechanisms according to rock mass structure are described. Rock mass simulation as an equivalent isotropic geomaterial through the widely used characterisation systems in most cases cannot lead to a realistic prediction of the distribution and the values of total displacements. In addition, the complete and accurate simulation of all discontinuities networks involves high uncertainty. Therefore in the numerical analyses carried out, based on an already applied approach, the stratification planes, which contain less uncertainty than the secondary discontinuities and affect significantly the behaviour of tunnel, were simulated as separate elements and the rock mass parts between them as an isotropic material. Additionally, using simple rock mechanics principles, an approach for the quantification of the rock mass properties involved in the analyses is described, which tries to obtain the equivalence between the stratified rock mass and the sum of the distinct rock mass elements (stratification planes and internal rock mass). The numerical analyses depict the mechanism of convergence development in stratified rock masses and the differences between isotropic, anisotropic and transversally isotropic approaches are clearly demonstrated. Based on the results of the numerical analyses the incorporation of the stratification planes leads to an increase of the convergence mainly due to the bending of the rock mass strata where the stratification is tangential to the tunnel section. This increase depends on the GSI value of the reference rock mass and the discontinuities surface conditions. © 2012 Elsevier B.V. en
heal.journalName Engineering Geology en
dc.identifier.doi 10.1016/j.enggeo.2012.05.001 en
dc.identifier.volume 141-142 en
dc.identifier.spage 74 en
dc.identifier.epage 83 en


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