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dc.contributor.authorBasnet, Chhatra Bahadur
dc.contributor.authorPanthi, Krishna Kanta
dc.date.accessioned2021-10-26T09:08:57Z
dc.date.available2021-10-26T09:08:57Z
dc.date.created2019-03-05T11:24:42Z
dc.date.issued2021
dc.identifier.citationGeosystem Engineering. 2021, 24 (1), 1-17.en_US
dc.identifier.issn1226-9328
dc.identifier.urihttps://hdl.handle.net/11250/2825596
dc.description.abstractThe Himalayan region is renowned with its complex topography and active tectonic movement, which causes accumulation and sudden release of strain energy instigating changes in the in-situ stress state. This paper evaluates in-situ stress state at the Upper Tamakoshi Hydroelectric Project where shotcrete lined headrace tunnel with considerable hydrostatic head is being implemented. Start of the pressure tunnel at the downstream-end was proposed inside slope topography of about 300 m above valley bottom based on in-situ stresses measured by 3D overcoring at the test tunnel located at valley level. It was believed that pressure tunnel start location with a hydrostatic head of 420 m was inferred to have almost similar in-situ stress state measured at the test tunnel. However, minimum principal stresses measured by hydraulic fracturing were found insufficient to avoid hydraulic jacking. This manuscript evaluates in-situ stress state of the area and explores reasons behind much lower stresses than expected. Detailed assessment of the stress state using both measured data and 3D numerical analysis is performed, which revealed that the stress state has high degree of spatial variation even at similar overburden conditions. The analysis further demonstrates that presence of local shear zone has considerable de-stressing effect.en_US
dc.language.isoengen_US
dc.publisherTaylor & Francisen_US
dc.titleEvaluation of in-situ stress state along the shotcrete lined high-pressure headrace tunnel at a complex Himalayan geological conditionen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holderThe published version of the article will not be available due to copyright restrictions by T&Fen_US
dc.source.pagenumber1-17en_US
dc.source.volume24en_US
dc.source.journalGeosystem Engineeringen_US
dc.source.issue1en_US
dc.identifier.doi10.1080/12269328.2018.1548306
dc.identifier.cristin1682326
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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