Blar i NTNU Open på forfatter "Selen, Lena"
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Assessment on the swelling and disintegration potential of weak and weathered rocks in water tunnels of hydropower projects - a contribution based on use of laboratory testing methods
Selen, Lena (Doctoral theses at NTNU;2020:354, Doctoral thesis, 2020)Swelling of rocks is a time-dependent phenomenon and a result of multiple and interactive rock characteristics interplaying in a complex picture. Further, the swelling responses of the rock mass are conditioned on the ... -
Assessment on the swelling and disintegration potential of weak and weathered rocks in water tunnels of hydropower projects – a contribution based on use of laboratory testing methods
Selen, Lena (HydroCen brief;Nr. 13, Report, 2022) -
Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability
Selen, Lena; Panthi, Krishna Kanta; Mørk, Mai Britt Engeness; Sørensen, Bjørn Eske (Journal article, 2021)Weak and weathered rocks are well known for their sensitivity to changes in moisture content. Degrading behavior is common in weak rocks with moisture-sensitive mineral components and present numerous stability problems. ... -
Cyclic oedometer swelling tests on rocks from North-Central Luzon, Philippines
Selen, Lena; Vergara, Maximiliano R.; Panthi, Krishna Kanta (Chapter, 2020)Tunnels passing through swelling rocks are subjected to stability problems as moisture changes affect the material properties of the rocks. The drying out process during construction may cause local contraction stresses ... -
Field testing of weak rock deformation in water tunnels: A practical review of the flatjack test
Selen, Lena; Panthi, Krishna Kanta; Tunbridge, Lloyd; Schönborn, Thomas (Chapter, 2019)The flatjack test is normally used to measure the average normal stress at a rock surface and to evaluate the rock mass deformation modulus. The aim of this manuscript is to present a modified variant of the flatjack test ... -
Influence of slaking and disintegration effect on the stability of water tunnels for hydropower
Selen, Lena; Panthi, Krishna Kanta (Chapter, 2019)The manuscript presents initial results of a potential linkage between the mineral composition and structural strength in geological samples from a hydropower tunnel currently under construction. Changes in rock properties ... -
Investigation on the Effect of Cyclic Moisture Change on Rock Swelling in Hydropower Water Tunnels
Selen, Lena; Panthi, Krishna Kanta; Vergara, Maximiliano R.; Mørk, Mai Britt Engeness (Peer reviewed; Journal article, 2021)This manuscript investigates the interaction between cyclic wetting and drying, material composition/structure and swelling potential of weathered rocks. Laboratory tests were performed at the Norwegian University of ... -
A review of the testing approaches in swelling rock conditions at three different institutions
Selen, Lena; Panthi, Krishna Kanta (Peer reviewed; Journal article, 2021)The swelling potential of weak rocks is crucial to assess in stability determinations of tunnels constructed for both infrastructure and hydropower. Among the institutions that are involved with extensive research on ... -
Slaking og disintegrering av svake bergarter i vanntunneler
Selen, Lena; Panthi, Krishna Kanta (Chapter, 2019)Endringer i materialparametere grunnet kjemisk og mekanisk forvitring er svært viktige problemstillinger i vanntunneler konstruert for vannkraft. Svake bergmasser inneholder et betydelig potensial for forvitring og ... -
STUDY ON MATERIAL PROPERTIES AND TESTING OF VARIOUS ROCK TYPES, DEVELOPMENT OF INVESTIGATION PROCEDURE AND TEST METHODOLOGY FOR FUTURE PROJECTS
Selen, Lena (Master thesis, 2017)This master thesis aims to provide insight and qualitative information about swelling mechanisms in volcanic rocks, in particular the swelling of rocks related to hydropower water tunnels. Additionally, traditional laboratory ... -
Swelling pressures of some rocks using different test procedures
Selen, Lena; Panthi, Krishna Kanta; Vergara, Maximilliano R. (Chapter, 2018)There are no clearly defined rules for the investigation procedures of swelling rocks. Difficulties are generally met for characterization and testing of swelling rocks and for prediction of the response to tunnel excavation. ...