Hydropower tunnels, penstocks and surge chambers

 

To give the future hydropower system the flexibility and behavior required to serve the demand from market, grid, bilateral power cables, new industry, new materials and advances in turbine and generator design, tunnel systems and penstocks must be designed different from the state of the art technology.

This includes research in long tunnels with quick response, increased dampening of surges, cost efficient large scale hydro tunnels, intake and reservoir design adapted to new tunnel systems, power houses constructed for flexible solutions, and reconstruction of dams and reservoirs.

This also includes reliable tunnels able to withstand new regimes in pressure and velocity variation. Former design principles are assumed to not take care of the new load regimes. Flexible operation will benefit from more reliable design and that will reduce operational risk of scheduling new hydropower technology hence increase the revenue potential.

Task WP 1.1 will to a great extent be organized through PhD-projects.

Two of the three PhD-projects directly linked to HydroCen are related to engineering geology.

Focusing on:

  • 1) Effects of swelling rock and swelling clay gouge on stability and support requirement
  • 2) Impact of peaking operation in unlined/shotcrete lined tunnels, respectively. The third is focusing on reconstruction and improvements of the tunnel system for upgrading of hydropower plants to peaking or pumped storage plants.

In addition, there is one NTNU PhD-project focusing on transition zones/plugs directly linked to WP 1.1, one focusing on reconstruction and improvements of the tunnel system and one associated PhD-project focusing on Tunnel Roughness (KPN).

Publications 2019

Conference Proceedings 2019

Selen, Lena; Panthi, Krishna Kanta. 
Influence of slaking and disintegration effect on the stability of water tunnels for hydropower. Proceedings: International Society for Rock Mechanics 2019 ISBN 978-981-11-9003-2. s. 1-11
NTNU 

Nilsen, Bjørn. 
Tunnelling technology in Norway. CSM lunch and learn seminar; 2019-01-30 - 2019-01-30
NTNU

Neupane, Bibek; Panthi, Krishna Kanta. 
Effect of pressure fluctuations in long-term stability of unlined pressure shaft at Svandalsflona Hydropower project, Norway. I: ARMS10 10th Asian Rock Mechanics Symposium The ISRM International Symposium for 2018, 29 Oct - 3 Nov, Singapore - proceedings. : International Society for Rock Mechanics 2019 ISBN 978-981-11-9003-2. s. 1-11
NTNU 

Panthi, Krishna Kanta; Basnet, Chhatra Bahadur. 
State-of-the-art design guidelines in the use of unlined pressure tunnels / shafts for hydropower scheme. I: ARMS10 10th Asian Rock Mechanics Symposium The ISRM International Symposium for 2018, 29 Oct - 3 Nov, Singapore - proceedings. : International Society for Rock Mechanics 2019 ISBN 978-981-11-9003-2. s. 1-13
NTNU

Bjørn Nilsen, Pål Drevland Jakobsen, Amund Bruland. Significance of mixed face conditions in hard rock TBM-tunnelling. TBM DiGS 2019, CSM

Publications 2018

Basnet, Chhatra Bahadur; Panthi, Krishna Kanta. Analysis of unlined pressure shafts and tunnels of selected Norwegian hydropower projects. Journal of Rock Mechanics and Geotechnical Engineering 2018 ;Volum 10.(3) s. 486-512. (ISSN 1674-7755)

NTNU 

Basnet, Chhatra Bahadur; Panthi, Krishna Kanta. Roughness evaluation in shotcrete-lined water tunnels with invert concrete based on cases from Nepal. Journal of Rock Mechanics and Geotechnical Engineering 2018 ;Volum 10.(1) s. 42-59

NTNU 

Nilsen, Bjørn. Stabilitetsproblem og ras i vanntunneler. Energiteknikk : fagbladet for energibransjen 2018 ;Volum 2. s. 44-45. NTNU 

Panthi, Krishna Kanta; Shrestha, Pawan Kumar. Estimating Tunnel Strain in the Weak and Schistose Rock Mass Influenced by Stress Anisotropy: An Evaluation Based on Three Tunnel Cases from Nepal. Rock Mechanics and Rock Engineering 2018 ;Volum 51.(6) s. 1823-1838. NTNU 

Wolfgang Richter, Kaspar Vereide, Gerald Zenz. Optimizing surge tank layout for highly flexible hydropower. Hydropower and Dams, 25(3)

Krishna Panthi, Chhatra BasnetA dynamic analysis of in-situ stress state at the Upper Tamakoshi Hydroelectric Project area. Hydro Nepal: Journal of Water, Energy and Environment 2018 ;Volume Issue.(23) p. 42-47.

Conference Proceedings 2018

Panthi, Krishna Kanta; Basnet, Chhatra Bahadur. 
A dynamic stress state analysis at the pressure tunnel of Upper Tamakoshi HPP, Nepal. I: Rock Dynamics and Applications 3: Proceedings of the 3rd International Conference on Rock Dynamics and Applications (RocDyn-3), June 26-27, 2018, Trondheim, Norway. CRC Press 2018 ISBN 978-0-8153-9667-3. s. 251-257
NTNU

Selen, Lena; Panthi, Krishna Kanta; Vergara, Maximilliano R..  Swelling pressures of some rocks using different test procedures. I: Geomechanics and Geodynamics of Rock Masses: Proceedings of the 2018 European Rock Mechanics Symposium. CRC Press 2018 ISBN 978-1-138-61645-5. s. 401-410. NTNU 

Ødegaard, Henki; Nilsen, Bjørn. Engineering Geological Investigation and Design of Transition Zones in Unlined Pressure Tunnels. ARMS10; 2018-10-29 - 2018-11-02

Bjørn Nilsen. Cases of tunnel instability and cave in - lessons learned and measures for prevention. Proc. World Tunnel Congress 2018, Dubai

Lena Selen, Krishna Panthi, Maximilliano R. Vergara. Swelling pressure of some rocks using two different test procedures. Eurorock 2018, St. Peterburg, Russia

Havrevoll, Ola Haugen; Vereide, Kaspar; Almeland, Silje Kreken. A new self-flushing rock trap concept for pump-storage plants. Particles in Europe; 2018-10-15 - 2018-10-17.

Nilsen, Bjørn. Hovedårsaker til stabilitetsproblemer og ras i vanntunneler. Produksjonsteknisk konferanse 2018; 2018-03-05 - 2018-03-07. NTNU

Nilsen, Bjørn. Stability of rock slopes and dam foundations. Workshop on Tunnelling and Hydropower issues; 2018-03-18 - 2018-03-18. NTNU 

Panthi, Krishna Kanta. Issues related to the long-term stability of unlined water tunnels in Norwegian hydropower projects – a case review. HydroVision International 2018; 2018-06-26 - 2018-06-28. NTNU

Leif Lia, Tor Oxhovd Svalesen, Stian L. Aaker, Guy Harris, Mattias Kullberg. Two year of performance of a penstock anchored by PU-foam. ICOLD Symposium Annual Meeting 2018, Wien.

Henki Ødegaard, Kaspar Vereide. Uforede luftputekammer - tre forslag til designforbedringer. Fjellsprengningsdagen 2018.
 
Livia Pitorac, Kaspar Vereide, Leif Lia. The effect of brook intakes, downstream surge tanks and reservoir levels on surge tank stability. Int. Conf. on Pressure Surges, Bordeaux, 14-16 nov 2018.
 
Leif Lia, Kaspar Vereide, Rolv Guddal, Kiflom Belete. Innovative solutions at spillway dam Deg. Hydro2018.
 
Lena Selen, Krishna Panthi. Influence of slaking and disintegration effect on the stability of water tunnels for hydropower. ARMS10 - 10th Asian Rock Mechanics and ISRM International Symposium, Singapore.

Publications 2017

Basnet, Chhatra Bahadur; Panthi, Krishna Kanta. 

3D in-Situ Stress Model of Upper Tamakoshi Hydroelectric Project Area. Hydro Nepal: Journal of Water, Energy and Environment 2017 ;Volum July Issue.(21) s. 34-41
NTNU  

Panthi, Krishna Kanta; Basnet, Chhatra Bahadur. 
Design review of the headrace system for the Upper Tamakoshi project, Nepal. International journal on hydropower and dams 2017 ;Volum 24.(Issue 1) s. 60-67
NTNU   
    
Rathore, Ajender; Panthi, Krishna Kanta. 
Evaluation of Powerhouse Cavern for the SachKhas Hydroelectric Project in Himachal, India. Hydro Nepal: Journal of Water, Energy and Environment 2017 ;Volum January.(20) s. 23-30
NTNU 

Wolfgang Richter, Kaspar Vereide, Gerald Zenz. Upgrading of a Norwegian pressurized sand trap combined with an open air surge tank. Geomechanics and Tunneling

Conference Proceedings 2017

Basnet, Chhatra Bahadur; Panthi, Krishna Kanta. Topographic Effect in the Selection of Unlined Pressure Tunnels / Shafts - A Review of a case from Nepal Himalaya. I: Proceedings of the ITA World Tunnel Congress 2017. : NFF - Norwegian Tunnelling Society 2017 ISBN 978-82-92641-40-8. s. -
NTNU

Panthi, Krishna Kanta. Review on the prevailing methods for the prediction of potential rock burst / rock spalling in tunnels. I: Fjellsprengningsdagen, Bergmekanikkdagen, Geoteknikkdagen. Oslo: Norsk Forening for Fjellsprengningsteknikk, Norsk Bergmekanikkgruppe og Norsk Geoteknisk Forening 2017 ISBN 978-82-8208-059-0. s. 29.1-29.8
NTNU

Nilsen, Bjørn. Geotechnical investigation and design principles - application of Eurocode 7 in Norwegian tunnelling 2) Tunnelling methodology for difficult rock mass conditions in deep subsea tunnels. Visit/seminar; 2017-11-30 - 2017-11-30. NTNU

Nilsen, Bjørn. Hydropower development in Norway - background, main achievements and research plans 2) Geotechnical investigation and design principles - application of Eurocode 7 in Norwegian tunnelling. Visit/seminar; 2017-11-28 - 2017-11-28. NTNU 

Kaspar Vereide, Leif Lia, Wolfgang Richter, Ola Haugen Havrevoll, Tom Jakobsen. Upgrading of sand traps in existing hydropower plants. World Tunnel Congress 2017; NFF - Norwegian Tunnelling Society 2017 ISBN 978-82-92641-40-8. 

Contact

About the Project

Full project title: Hydropower tunnels, penstocks, and surge chambers

Duration: 2017-2021

Objective: Develop new technology for headrace tunnels, penstock, surge chambers and enlarging the tunnels.

R&D Partners: NTNU, Colorado School of Mines (CSM), Institut Teknologi Bandung (ITB) Indonesia, Graz Technical University (TU Graz), EPFL Lausanne, Power China Changsha.

Associated projects: Tunnel Roughness (KPN)

Researchers working on the project: Bjørn Nilsen, Krishna Panthi, Kaspar Vereide, Leif Lia, Pål-Tore Storli, Roger Olsson, Nils Rüther, Elena Pummer. 

PhD working on the project: Ola Haugen Havrevoll, Bibek Neupane, Lena Selen, Henki Ødegaard and Livia Pitorac.

Master students associated with the project: Lena Selen, Silje-Elin Skrede, Bikash Thapa, Anne Leroquais, Anna Helene Mong Urdal, Snorre Anneson Ledsaak Solli, Ragna Torås Halseth, Debora Bardini, Sofie Marie Steinkjer, Håvard Barkved, Jana Daxnerova, Alexander Torbergsen, Linn Døvle, Haakon Jørlo Haugerud, Runa Berstad Frengen, Tonje Mek Eidset, Erik Kleiven, Steven Sergij Salim, Daniel Pace, Ingrid Gulbransen.