Headrace Tunnel Research Articles

Engineering geological evaluation of the Of-Solakli hydropower development project (N.E. Turkey)

The Of-Solakli Hydropower Development Project (HDP) is designed to generate 380 MW of electricity through the diversion of six streams into a headrace tunnel and maintaining a head difference of 1 000 m above the underground power station. The tunnel system is located within felsic and mafic magmatic rocks, and volcanogenic flysch.

Investigation of the headrace tunnel at Sendai Atago-shita hydraulic power station in Taisyou Era

[in Japanese]

NATM to the rescue at Samanalawewa : Hagenhofer, F. Tunn TunnlgV22, N7, July 1990, P19–22

Unexpected encounters with very soft, flowing ground and the presence of groundwater led to severe difficulties with the excavation of the headrace tunnel. The traditional design had to be changed to allow for new support methods developed through observations on site and the application of the New Austrian Tunneling Method.

Construction problems of Bhaba Project head race tunnel — some solutions : Chauhan, R L; Katoch, S C; Chauhan, R S Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19–23 January 1988V1, P391–395. Publ New Delhi: Oxford and IBH Publishing Co, 1988

Construction problems of Bhaba Project head race tunnel — some solutions : Chauhan, R L; Katoch, S C; Chauhan, R S Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19–23 January 1988V1, P391–395. Publ New Delhi: Oxford and IBH Publishing Co, 1988

Planning and construction of concrete lining in head race tunnel surge and penstock tunnels of Upper Kolab Project in Orissa : Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19–23 January 1988 V1, P287-2-292. Publ New Delhi: Oxford and IBH Publishing Co, 1988

Planning and construction of concrete lining in head race tunnel surge and penstock tunnels of Upper Kolab Project in Orissa : Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19–23 January 1988 V1, P287-2-292. Publ New Delhi: Oxford and IBH Publishing Co, 1988

Excavation by tunnel boring machine in headrace tunnel of small cross section : Proc 6th Australian Tunnelling Conference, Melbourne, March 1987 V1, P287–298. Publ Parkville: AusIMM, 1987

Excavation by tunnel boring machine in headrace tunnel of small cross section : Proc 6th Australian Tunnelling Conference, Melbourne, March 1987 V1, P287–298. Publ Parkville: AusIMM, 1987

Rapid excavation of a 5.7 km headrace tunnel in Shin'Aimoto hydroelectric power plant project - geostatistical assessment and TBM application : Tanimoto, C; Yoshikawa, T; Hohjo, A Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12–16 September 1988V1, P397–405. Publ Rotterdam: A A Balkema, 1988

Rapid excavation of a 5.7 km headrace tunnel in Shin'Aimoto hydroelectric power plant project - geostatistical assessment and TBM application : Tanimoto, C; Yoshikawa, T; Hohjo, A Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12–16 September 1988V1, P397–405. Publ Rotterdam: A A Balkema, 1988

Mingtan headrace tunnels crossing Tousheh river : Chen-Yi Kao; Chi-Shou Hsieh Proc symposium on rock mechanics and power plants, Madrid, 12–16 september 1988v1, p347–357. Publ Rotterdam: A A Balkema, 1988

Mingtan headrace tunnels crossing Tousheh river : Chen-Yi Kao; Chi-Shou Hsieh Proc symposium on rock mechanics and power plants, Madrid, 12–16 september 1988v1, p347–357. Publ Rotterdam: A A Balkema, 1988

新愛本発電所建設におけるトンネルの急速施工と岩盤のゆるみ現象

The Shin-Aimoto Hydro-electric Power Station of 124MW has been completed on Kurobe River by Kansai Electric Power Company in 1985. The construction of the longest headrace tunnel of 5.7km was subject to the critical path in the whole project. The feasibility study was carefully carried out from the rock mechanical point of view. Rocks are gneiss, diorite and limestone which belong to Hida Metamorphic Zone in the central Japan, and the mechanical characteristics of rocks showed remarkable variation with wide range. Rock classification was discussed geostatistically with the combination of CRIEPI's method and Barton's Q-system. In order to get successful result in rapid excavation the TBM and long drill-and-blast methods were applied to the above-mentioned headrace tunnel. Also, the mechanism of “loosening” has been analyzed in comparison between TBM and blasting methods.

886447 Tunnel boring at Vinstra power plant, Norway — excavation of the 17-km long headrace tunnel by use of tunnel-boring machines : Borg, A Proc Tunnelling '88, London, 18–21 April 1988P9–23. Publ London: IMM, 1988

886447 Tunnel boring at Vinstra power plant, Norway — excavation of the 17-km long headrace tunnel by use of tunnel-boring machines : Borg, A Proc Tunnelling '88, London, 18–21 April 1988P9–23. Publ London: IMM, 1988

Cavern around a powerplant headrace tunnel tube: Milanovic, P; Vucic, M; Jokanovic, V Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug–3 Sept 1987V1, P197–201. Publ Rotterdam: A A Balkema, 1987

Cavern around a powerplant headrace tunnel tube: Milanovic, P; Vucic, M; Jokanovic, V Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug–3 Sept 1987V1, P197–201. Publ Rotterdam: A A Balkema, 1987

Tunnelling in a complex rock mass: Experience from Vietas, Swedish Lapland

The headrace tunnels 2 and 3 at the Vietas hydro power station, Swedish Lapland, penetrate the lower nappes of the Scandinavian Caledonides as well as the Precambrian basement. Various geological features have influenced the alignment and the excavation and also have partially determined the shape of the tunnels. High rock stress effects have occurred and stress measurements have been carried out in both tunnels. The relationshio between the geological structures and the state of stress indicates that the stress is of tectonic origin and that it has been induced by forces that are still active. Les galeries d'amenée 2 et 3 de l'usine hydroélectrique de Vietas en Laponie suédoise pénètrent dans les nappes basses des Calédonides scandinaves aussi bien que dans le socle précambrien. Différents facteurs géologiques ont influencé sur le tracé et le creusement et ont aussi en partie déterminé la forme des galeries. Des effets de contrainte des roches élevées ont été provoqués et des mesures de contrainte ont été effectuées dans les deux galeries. La relation entre les structures géologiques et l'état des contraintes indique que la contrainte est d'origine tectonique et qu'elle est due à des forces qui sont toujours actives.

Hydraulic fracturing - a simple tool for controlling the safety of unlined high pressure shafts and headrace tunnels : Vik, G; Tunbridge, L Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1–3 Sept 1986P591–597. Publ Lulea: Centek, 1986

Hydraulic fracturing - a simple tool for controlling the safety of unlined high pressure shafts and headrace tunnels : Vik, G; Tunbridge, L Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1–3 Sept 1986P591–597. Publ Lulea: Centek, 1986

Initial rock stresses around the Vietas headrace tunnels nos. 2 and 3, Sweden : Martna, J; Hansen, L Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1–3 Sept 1986P605–613. Publ Lulea: Centek, 1986

Initial rock stresses around the Vietas headrace tunnels nos. 2 and 3, Sweden : Martna, J; Hansen, L Proc International Symposium on Rock Stress and Rock Stress Measurement, Stockholm, 1–3 Sept 1986P605–613. Publ Lulea: Centek, 1986

Geotechnical problems and construction features of head race tunnel of Rammam hydro-electric project stage II at Darjeeling Himalayas in West Bengal (India) : Bagchi, A Proc International Symposium on Large Rock Caverns, Helsinki, 25–28 August 1986 V1, P263–275. Publ Oxford: Pergamon Press, 1986

Geotechnical problems and construction features of head race tunnel of Rammam hydro-electric project stage II at Darjeeling Himalayas in West Bengal (India) : Bagchi, A Proc International Symposium on Large Rock Caverns, Helsinki, 25–28 August 1986 V1, P263–275. Publ Oxford: Pergamon Press, 1986

Vietas Hydroelectric Power Station Headrace Tunnel 3. Documentation of geology and excavation : Martna, J; Hansen, L Vattenfall, Swedish State Power Board, final report July 1986, 62P

Vietas Hydroelectric Power Station Headrace Tunnel 3. Documentation of geology and excavation : Martna, J; Hansen, L Vattenfall, Swedish State Power Board, final report July 1986, 62P

Concrete lining of the Loktak headrace tunnel : Tyagi, G D; Sharma, K S In: Tunnelling '85 (paper to the Conference, Brighton, 10–15 March 1985)P73–77. Publ London: IMM, 1985

Concrete lining of the Loktak headrace tunnel : Tyagi, G D; Sharma, K S In: Tunnelling '85 (paper to the Conference, Brighton, 10–15 March 1985)P73–77. Publ London: IMM, 1985

6. Performance characteristics of a tunnel boring machine from the geomechanical viewpoint

A small-diameter tunnel boring machine was used for the excavation of a headrace tunnel (excavated diameter 2.6m, length approximately 1145 m) at a small hydro project for the Electric Power Development Co. Ltd. Based on detailed geological investigations, the rock mass was classified comprehensively into five levels according to hardness of the rock, degree of weathering, spacing of cracks, etc. In addition, lateral loading tests in boreholes, seismic tests and laboratory tests on rock cores were carried out. The modulus of deformation, seismic wave velocity, thickness of loosened zone and the uniaxial compressive strength of the rock were obtained from the results of these tests. Additionally, the mechanical performance of the tunnel boring machine during excavation was recorded. Thrust, torque, excavation rate and abrasion loss from the cutters were examined in detail for each excavation section. It was found that the performance characteristics of the machine have a close relation with the rock mass classes. Studies were also undertaken to evaluate the excavation cost as a function of the geological conditions when using the tunnel boring machine.

Improvements on blasting technique for headrace tunnels : Kanoh, Y; Ohtsuka, M Proc 6th Rapid Excavation and Tunneling Conference, Chicago, 12–16 June 1983V1, P282–296. Publ New York: AIME, 1983

Improvements on blasting technique for headrace tunnels : Kanoh, Y; Ohtsuka, M Proc 6th Rapid Excavation and Tunneling Conference, Chicago, 12–16 June 1983V1, P282–296. Publ New York: AIME, 1983

RAPID CONSTRUCTION OF A LONG HEADRACE TUNNEL OF SHINAIMOTO HYDRO-ETECTRIC POWER STATION

RAPID CONSTRUCTION OF A LONG HEADRACE TUNNEL OF SHINAIMOTO HYDRO-ETECTRIC POWER STATION