Blar i Publikasjoner fra CRIStin - NTNU på forfatter "Ødegaard, Henki"
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Design of unlined pressure tunnels in Norway – limitations of empirical overburden criteria and significance of in-situ rock stress measurements
Ødegaard, Henki; Nilsen, Bjørn; Barkved, Håvard (Chapter, 2020)A key requirement for unlined pressure tunnels is confinement, i.e. that the minimum principal stress must exceed the internal water pressure. Failure to meet this requirement can cause hydraulic jacking of the rock mass, ... -
Engineering Geological Investigation and Design of Transition Zones in Unlined Pressure Tunnels
Ødegaard, Henki; Nilsen, Bjørn (Chapter, 2019)The transition zone, i.e. where the pressurized water enters the steel lined section of the waterway, is a key component of the entire tunnel system in any underground hydropower project utilizing unlined pressure tunnels. ... -
Improved design of unlined air cushion surge chambers
Ødegaard, Henki; Vereide, Kaspar; Nilsen, Bjørn (Peer reviewed; Journal article, 2021)An overview of important design considerations for unlined air cushion surge chambers is given and three innovative solutions that can enable a safer and more economic design are presented. The paper is based on information ... -
Om tommelfingerregler og konusplassering i norske kraftverk
Ødegaard, Henki; Barkved, Håvard; Nilsen, Bjørn (Chapter, 2019)Et sentralt designprinsipp for uforede trykktunneler er at bergspenningene må overstige det innvendige vanntrykket i tunnelen. I motsatt fall kan man få hydraulisk jekking av tunnelen med store vannlekkasjer og tilhørende ... -
Rock Stress Measurements for Unlined Pressure Tunnels: A True Triaxial Laboratory Experiment to Investigate the Ability of a Simplified Hydraulic Jacking Test to Assess Fracture Normal Stress
Ødegaard, Henki; Nilsen, Bjørn (Peer reviewed; Journal article, 2021)To avoid hydraulic failure of unlined pressure tunnels, knowledge of minimum principal stress is needed. Such knowledge is only obtainable from in situ measurements, which are often time-consuming and relatively costly, ...