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S. Karki
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Fault induced problems in hydropower tunnels in Nepal: A case study B. Chhushyabaga; S. Karki; S.S. Khadka
Lowland Technology International Vol 21 No 4, March (2020): Special Issue on: Engineering Geology and Geotechniques for Developing Co
Publisher : International Association of Lowland Technology

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Abstract

This study focuses on the fault induced problems in the hydropower tunnels in Lesser Himalaya Region of Nepal and its stability using Numerical analysis. The presence of fault in the rock mass increases the existing in-situ stress beyond its critical level and strength. Due to which squeezing, swelling in sheared, schistosed, deformed rock mass and spalling, rock bursts in intact, unjointed rock mass are frequently encountered. The existing methods of the stability analysis, estimation of tunnel support using rock mass classifications do not consider the effect of the fault. A detailed study using 2D numerical analysis is carried out using the geological data, rock mass and fault encountered in hydropower tunnel. A comparison is then made between the analysis result of the tunnel with and without the fault to actual tunnel of case study.
Design and Analysis of Squeezing Ground Hydropower Tunnel in the Himalaya through a Case Study S. Karki; B. Karki; B. Chhushyabaga; S.S. Khadka
Lowland Technology International Vol 21 No 4, March (2020): Special Issue on: Engineering Geology and Geotechniques for Developing Co
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Nepal is a country with varying topography and steep fast flowing rivers, high head hydropower projects are preferred in the region. Currently, numerous hydropower tunnels are being constructed and many more have been proposed. The varying geology along with weak rock mass has created several stability problems like squeezing and support failures. Through a case study in the Lesser Himalayan Region, this paper focuses on the assessment and analysis of tunnel sections in squeezing ground through analytical and numerical modelling. The most commonly adopted Rock Mass Classification approach for estimation of tunnel support seems inadequate to address the problem associated with tunneling in the Himalayas. Therefore, the knowledge of rock mass strength and deformation behavior is required for the optimal design of tunnel support in such geological conditions. Finite element analysis is carried out for face stability of tunnel in very poor rock mass by improving the rock mass to predict the real behavior of squeezing ground. The results of the analysis show that along with the use of empirical and analytical approach, numerical analysis should be used from the preliminary stages of design and care should be taken while modelling very poor rock mass where the stability of rock ahead of tunnel face is essential.
Co-Authors B. Chhushyabaga B. Karki S.S. Khadka